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                                                                EXHIBIT 5.2




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                         SECOND SUPPLEMENTAL INDENTURE

                           Dated as of July 24, 1996

                                    between

                                MCN CORPORATION,

                                   AS ISSUER

                                      and

                                    NBD BANK

                                   AS TRUSTEE


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                               TABLE OF CONTENTS




                                                                           Page
                                                                      

                                   ARTICLE I
                                  DEFINITIONS

SECTION 1.1.            Definition of Terms  . . . . . . . . . . . . . .    2

                                   ARTICLE II
                 GENERAL TERMS AND CONDITIONS OF THE DEBENTURES

SECTION 2.1.            Designation and Principal Amount . . . . . . . .    3
SECTION 2.2.            Maturity . . . . . . . . . . . . . . . . . . . .    3
SECTION 2.3.            Form and Payment . . . . . . . . . . . . . . . .    3
SECTION 2.4.            Global Debenture . . . . . . . . . . . . . . . .    4
SECTION 2.5.            Interest . . . . . . . . . . . . . . . . . . . .    5

                                  ARTICLE III
                          REDEMPTION OF THE DEBENTURES

SECTION 3.1.            Special Event Redemption   . . . . . . . . . . .    7
SECTION 3.2.            Optional Redemption by Company   . . . . . . . .    7
SECTION 3.3.            No Sinking Fund  . . . . . . . . . . . . . . . .    8

                                   ARTICLE IV
                      EXTENSION OF INTEREST PAYMENT PERIOD

SECTION 4.1.            Extension of Interest Payment Period . . . . . .    8
SECTION 4.2.            Notice of Extension  . . . . . . . . . . . . . .    9
SECTION 4.3.            Limitation of Transactions   . . . . . . . . . .   10

                                   ARTICLE V
                                    EXPENSES

SECTION 5.1.            Payment of Expenses  . . . . . . . . . . . . . .   10
SECTION 5.2             Payment Upon Resignation or Removal  . . . . . .   11

                                   ARTICLE VI
                                     NOTICE

SECTION 6.1             Notice by the Company  . . . . . . . . . . . . .   11

                                  ARTICLE VII
                          COVENANT TO LIST ON EXCHANGE

SECTION 7.1.            Listing on an Exchange   . . . . . . . . . . . .   12

                                  ARTICLE VIII
                               FORM OF DEBENTURE

SECTION 8.1.            Form of Debenture  . . . . . . . . . . . . . . .   13






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                                  ARTICLE IX
                        ORIGINAL ISSUE OF DEBENTURES

SECTION 9.1.            Original Issue of Debentures   . . . . . . . . . .   22

                                  ARTICLE X
                                MISCELLANEOUS

SECTION 10.1.           Ratification of Indenture  . . . . . . . . . . . .   22
SECTION 10.2.           Trustee Not Responsible for Recitals . . . . . . .   22
SECTION 10.3.           Governing Law  . . . . . . . . . . . . . . . . . .   23
SECTION 10.4.           Separability . . . . . . . . . . . . . . . . . . .   23
SECTION 10.5.           Counterparts . . . . . . . . . . . . . . . . . . .   23






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          SECOND SUPPLEMENTAL INDENTURE, dated as of July 24, 1996 (the "Second
Supplemental Indenture"), between MCN Corporation, a corporation duly organized
and existing under the laws of the State of Michigan, having its principal
office at 500 Griswold Street, Detroit, Michigan 48226, (the "Company"), and NBD
Bank as trustee (the "Trustee").

          WHEREAS, the Company executed and delivered the indenture dated as of
September 1, 1994 (the "Base Indenture") as supplemented by a first supplemental
indenture, dated April 17, 1996 (the "First Supplemental Indenture") (the Base
Indenture as so supplemented the "Indenture), to the Trustee to provide for the
future issuance of the Company's unsecured debentures, notes or other evidence
of indebtedness (the "Securities"), to be issued from time to time in one or
more series as might be determined by the Company under the Indenture;

          WHEREAS, pursuant to the terms of the Indenture, the Company desires
to provide for the establishment of a new series of its Securities to be known
as its 8 5/8% Junior Subordinated Debentures due 2036 (the "Debentures"), the
form and substance of such Debentures and the terms, provisions and conditions
thereof to be set forth as provided in the Indenture and this Second
Supplemental Indenture;

          WHEREAS, MCN Financing I, a Delaware statutory business trust (the
"Trust"), has offered to the public $80,000,000 million aggregate liquidation
amount of its 8 5/8% Trust Originated Preferred Securities (the "Preferred
Securities"), representing undivided beneficial interests in the assets of the
Trust and proposes to invest the proceeds from such offering, together with the
proceeds of the issuance and sale by the Trust to the Company of $2,474,250
million aggregate liquidation amount of its 8 5/8% Trust Originated Common
Securities (the "Common Securities" and together with the Preferred Securities,
the "Trust Securities"), in $82,474,250 million aggregate principal amount of
the Debentures; and

          WHEREAS, the Company has requested that the Trustee execute and
deliver this Second Supplemental Indenture and all requirements necessary to
make this Second Supplemental Indenture a valid instrument in accordance with
its terms, and to make the Debentures, when executed by the Company and
authenticated and delivered by the Trustee, the valid obligations of the
Company, have been performed, and the execution and delivery of this Second
Supplemental Indenture has been duly authorized in all respects:

          NOW THEREFORE, in consideration of the purchase and acceptance of the
Debentures by the Holders thereof, and for the purpose of setting forth, as
provided in the Indenture,





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the form and substance of the Debentures and the terms, provisions and
conditions thereof, the Company covenants and agrees with the Trustee as
follows:


                                   ARTICLE I
                                  DEFINITIONS

SECTION 1.1.      Definition of Terms.

           Unless the context otherwise requires:

          (a)   a term defined in the Indenture has the same meaning when used
in this Second Supplemental Indenture;

          (b)   a term defined anywhere in this Second Supplemental Indenture
has the same meaning throughout;

          (c)   the singular includes the plural and vice versa;

          (d)   headings are for convenience of reference only and do not affect
interpretation;

          (e)   the following terms have the meanings given to them in the
Declaration:  (i) Business Day; (ii) Clearing Agency; (iii) Delaware Trustee;
(iv) Depositary; (v) Dissolution Tax Opinion; (vi) No Recognition Opinion; (vii)
Preferred Security Certificate; (viii) Pricing Agreement; (ix) Institutional
Trustee; (x) Regular Trustees; (xi) Special Event; (xii) Tax Event; (xiii)
Investment Company Event; and (xiv) Underwriting Agreement;

          (f)   the following terms have the meanings given to them in this
Section 1.1(f):

          "Additional Interest" shall have the meaning set forth in Section 2.5.

          "Compounded Interest" shall have the meaning set forth in Section 4.1.

          "Declaration" means the Amended and Restated Declaration of Trust of
MCN Financing I, a Delaware statutory business trust, dated as of July 24, 1996.

          "Deferred Interest" shall have the meaning set forth in Section 4.1.

          "Dissolution Event" means that, as a result of the occurrence and
continuation of a Special Event, the Trust is to be dissolved in accordance with
the Declaration, and the





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Debentures held by the Institutional Trustee are to be distributed to the
holders of the Trust Securities issued by the Trust pro rata in accordance with
the Declaration.

          "Extended Interest Payment Period" shall have the meaning set forth in
Section 4.1.

          "Global Debenture" shall have the meaning set forth in Section 2.4.

          "Maturity Date" means the date on which the Debentures mature and on
which the principal shall be due and payable together with all accrued and
unpaid interest thereon including Compounded Interest and Additional Interest,
if any.

          "Non Book-Entry Preferred Securities" shall have the meaning set forth
in Section 2.4.

          "Optional Redemption Price" shall have the meaning set forth in
Section 3.2.


                                   ARTICLE II
                 GENERAL TERMS AND CONDITIONS OF THE DEBENTURES

SECTION 2.1.      Designation and Principal Amount.

          There is hereby authorized a series of Securities designated the "8
5/8% Junior Subordinated Debentures due 2036", limited in aggregate principal
amount to $82,474,250 million, which amount shall be as set forth in any written
order of the Company for the authentication and delivery of Debentures pursuant
to Section 303 of the Indenture.

SECTION 2.2.      Maturity.  The Maturity Date will be July 30, 2036.

SECTION 2.3.      Form and Payment.

          Except as provided in Section 2.4, the Debentures shall be issued in
fully registered certificated form without interest coupons.  Principal and
interest on the Debentures issued in certificated form will be payable, the
transfer of such Debentures will be registrable and such Debentures will be
exchangeable for Debentures bearing identical terms and provisions at the office
or agency of the Institutional Trustee; provided, however, that payment of
interest may be made at the option of the Company by check mailed to the Holder
at such address as shall appear in the Security Register.  Notwithstanding the
foregoing, so long as the Holder of any Debentures is the Institutional Trustee,
the payment of the







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principal of and interest (including Compounded Interest and Additional
Interest, if any) on such Debentures held by the Institutional Trustee will be
made at such place and to such account as may be designated by the
Institutional Trustee.

SECTION 2.4.  Global Debenture.

          (a)  In connection with a Dissolution Event,

               (i)  the Debentures in certificated form may be presented to the
     Trustee by the Institutional Trustee in exchange for a global Debenture in
     an aggregate principal amount equal to the aggregate principal amount of
     all outstanding Debentures (a "Global Debenture"), to be registered in the
     name of the Depositary, or its nominee, and delivered by the Institutional
     Trustee to the Depositary for crediting to the accounts of its participants
     pursuant to the instructions of the Regular Trustees.  The Company upon any
     such presentation shall execute a Global Debenture in such aggregate
     principal amount and deliver the same to the Trustee for authentication and
     delivery in accordance with the Indenture and this Second Supplemental
     Indenture. Payments on the Debentures issued as a Global Debenture will be
     made to the Depositary; and

               (ii) if any Preferred Securities are held in non book-entry
     certificated form, the Debentures in certificated form may be presented to
     the Trustee by the Institutional Trustee and any Preferred Security
     Certificate which represents Preferred Securities other than Preferred
     Securities held by the Clearing Agency or its nominee ("Non Book-Entry
     Preferred Securities") will be deemed to represent beneficial interests in
     Debentures presented to the Trustee by the Institutional Trustee having an
     aggregate principal amount equal to the aggregate liquidation amount of the
     Non Book-Entry Preferred Securities until such Preferred Security
     Certificates are presented to the Security Registrar for transfer or
     reissuance at which time such Preferred Security Certificates will be
     cancelled and a Debenture, registered in the name of the holder of the
     Preferred Security Certificate or the transferee of the holder of such
     Preferred Security Certificate, as the case may be, with an aggregate
     principal amount equal to the aggregate liquidation amount of the Preferred
     Security Certificate cancelled, will be executed by the Company and
     delivered to the Trustee for authentication and delivery in accordance with
     the Indenture and this Second Supplemental Indenture.  On issue of such
     Debentures, Debentures with an equivalent aggregate principal amount that
     were pre-






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     sented by the Institutional Trustee to the Trustee will be deemed to have
     been cancelled.

          (b)   Unless and until it is exchanged for the Debentures in
registered form, a Global Debenture may be transferred, in whole but not in
part, only to another nominee of the Depository, or to a successor Depositary
selected or approved by the Company or to a nominee or such successor
Depositary.

          (c)   If at any time the Depositary notifies the Company that it is
unwilling or unable to continue as Depositary or if at any time the Depositary
for such series shall no longer be registered or in good standing under the
Securities Exchange Act of 1934, as amended, or other applicable statute or
regulation, and a successor Depositary for such series is not appointed by the
Company within 90 days after the Company receives such notice or becomes aware
of such condition, as the case may be, the Company will execute, and, subject
to Article III of the Indenture the Trustee, upon written notice from the
Company, will authenticate and deliver the Debentures in definitive registered
form without coupons, in authorized denominations, and in an aggregate
principal amount equal to the principal amount of the Global Debenture in
exchange for such Global Debenture.  In addition, the Company may at any time
determine that the Debentures shall no longer be represented by Global
Debenture.  In such event the Company will execute, and subject to Section 301
of the Indenture, the Trustee, upon receipt of an Officers Certificate
evidencing such determination by the Company, will authenticate and deliver the
Debentures in definitive registered form without coupons, in authorized
denominations, and in an aggregate principal amount equal to the principal
amount of the Global Debenture in exchange fro such Global Debenture.  Upon the
exchange of the Global Debenture for such Debentures in definitive registered
form without coupons, in authorized denominations, the Global Debenture shall be
cancelled by the Trustee.  Such Debentures in definitive registered form issued
in exchange for the Global Debenture shall be registered in such named an in
such authorized denominations as the Depositary pursuant to instructions from
its direct or indirect participants or otherwise, shall instruct the Trustee.
The Trustee shall deliver such Securities to the Depositary for deliver to the
Persons in whose names such Securities are so registered.

SECTION 2.5.    Interest.

          (a)   Each Debenture will bear interest at the rate of 8 5/8% per 
annum (the "Coupon Rate") from the original date of issuance until the
principal thereof becomes due and payable, and on any overdue principal and (to
the extent that




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payment of such interest is enforceable under applicable law) on any overdue
installment of interest at the Coupon Rate, compounded quarterly, payable
(subject to the provisions of Article IV) quarterly in arrears on March 31,
June 30, September 30 and December 31 of each year (each, an "Interest Payment
Date," commencing on September 30, 1996), to the Person in whose name such
Debenture or any predecessor Debenture is registered, at the close of business
on the regular record date for such interest installment, which, in respect of
(i) Debentures of which the Institutional Trustee is the Holder and the
Preferred Securities are in book-entry only form or (ii) a Global Debenture,
shall be the close of business on the Business Day next preceding that Interest
Payment Date.  Notwithstanding the foregoing sentence, if (i) the Debentures
are held by the Institutional Trustee and the Preferred Securities are no
longer in book-entry only form or (ii) the Debentures are not represented by a
Global Debenture, the Company may select a regular record date for such
interest installment which shall be any date at least one Business Day before
an Interest Payment Date.

          (b)   The amount of interest payable for any period will be computed
on the basis of a 360-day year of twelve 30-day months.  Except as provided in
the following sentence, the amount of interest payable for any period shorter
than a full quarterly period for which interest is computed, will be computed on
the basis of the actual number of days elapsed in such a 90-day period. In the
event that any date on which interest is payable on the Debentures is not a
Business Day, then payment of interest payable on such date will be made on the
next succeeding day which is a Business Day (and without any interest or other
payment in respect of any such delay), except that, if such Business Day is in
the next succeeding calendar year, such payment shall be made on the immediately
preceding Business Day, in each case with the same force and effect as if made
on such date.

          (c)   If, at any time while the Institutional Trustee is the Holder of
any Debentures, the Trust or the Institutional Trustee is required to pay any
taxes, duties, assessments or governmental charges of whatever nature (other
than withholding taxes) imposed by the United States, or any other taxing
authority, then, in any case, the Company will pay as additional interest
("Additional Interest") on the Debentures held by the Institutional Trustee,
such additional amounts as shall be required so that the net amounts received
and retained by the Trust and the Institutional Trustee after paying such taxes,
duties, assessments or other governmental charges will be equal to the amounts
the Trust and the Institutional Trustee would have received had no such taxes,
duties, assessments or other government charges been imposed.






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                                  ARTICLE III
                          REDEMPTION OF THE DEBENTURES

SECTION 3.1.    Special Event Redemption.

          If a Special Event, whether a Tax Event or an Investment Company
Event, has occurred and is continuing and:

          (a)   the Company has received a Redemption Tax Opinion; or

          (b)   after receiving a Dissolution Tax Opinion, the Regular Trustees
     shall have been informed by tax counsel rendering the Dissolution Tax
     Opinion that a No Recognition Opinion cannot be delivered to the Trust; or

          (c)   the Company has received an Investment Company Event Opinion,
     then, notwithstanding Section 3.2(a) but subject to Section 3.2(b), the
     Company shall have the right upon not less than 30 days nor more than 60
     days notice to the Holders of the Debentures to redeem the Debentures, in
     whole or in part, for cash within 90 days following the occurrence of such
     Tax Event (the "90 Day Period") at a redemption price equal to 100% of the
     principal amount to be redeemed plus any accrued and unpaid interest
     thereon to the date of such redemption (the "Redemption Price"), provided
     that if at the time there is available to the Company the opportunity to
     eliminate, within the 90 Day Period, the Tax Event by taking some
     ministerial action ("Ministerial Action"), such as filing a form or making
     an election, or pursuing some other similar reasonable measure which has no
     adverse effect on the Company, the Trust or the Holders of the Trust
     Securities issued by the Trust, the Company shall pursue such Ministerial
     Action in lieu of redemption, and, provided, further, that the Company
     shall have no right to redeem the Debentures while the Trust is pursuing
     any Ministerial Action pursuant to its obligations under the Declaration.
     The Redemption Price shall be paid prior to 12:00 noon, New York time, on
     the date of such redemption or such earlier time as the Company determines,
     provided that the Company shall deposit with the Trustee an amount
     sufficient to pay the Redemption Price by 10:00 a.m., New York time, on the
     date such Redemption Price is to be paid.

SECTION 3.2.  Optional Redemption by Company.

          (a)   Subject to the provisions of Section 3.2(b) and to the
provisions of Article XI of the Indenture, except as otherwise may be specified
in this Second Supplemental Indenture, the Company shall have the right to
redeem the







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Debentures, in whole or in part, from time to time, on or after July, 2001, at
a redemption price equal to 100% of the principal amount to be redeemed plus
any accrued and unpaid interest thereon to the date of such redemption (the
"Optional Redemption Price").  Any redemption pursuant to this paragraph will
be made upon not less than 30 days nor more than 60 days notice to the Holder
of the Debentures, at the Optional Redemption Price.  If the Debentures are
only partially redeemed pursuant to this Section 3.2, the Debentures will be
redeemed pro rata or by lot or by any other method utilized by the Trustee;
provided, that if at the time of redemption the Debentures are registered as a
Global Debenture, the Depositary shall determine, in accordance with its
procedures, the principal amount of such Debentures held by each Holder of
Debenture to be redeemed.  The Optional Redemption Price shall be paid prior to
12:00 noon, New York time, on the date of such redemption or at such earlier
time as the Company determines provided that the Company shall deposit with the
Trustee an amount sufficient to pay the Optional Redemption Price by 10:00
a.m., New York time, on the date such Optional Redemption Price is to be paid.

          (b)   If a partial redemption of the Debentures would result in the
delisting of the Preferred Securities issued by the Trust from any national
securities exchange or other organization on which the Preferred Securities are
then listed, the Company shall not be permitted to effect such partial
redemption and may only redeem the Debentures in whole.

SECTION 3.3.  No Sinking Fund.

          The Debentures are not entitled to the benefit of any sinking fund.


                                   ARTICLE IV
                      EXTENSION OF INTEREST PAYMENT PERIOD

SECTION 4.1.  Extension of Interest Payment Period.

          The Company shall have the right, at any time and from time to time
during the term of the Debentures, to defer payments of interest by extending
the interest payment period of such Debentures for a period not exceeding 20
consecutive quarters (the "Extended Interest Payment Period"), during which
Extended Interest Payment Period no interest shall be due and payable; provided
that no Extended Interest Payment Period may extend beyond the Maturity Date. To
the extent permitted by applicable law, interest, the payment of which has been
deferred because of the extension of the interest payment period pursuant to
this Section 4.1, will bear inter-







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est thereon at the Coupon Rate compounded quarterly for each quarter of the
Extended Interest Payment Period ("Compounded Interest").  At the end of the
Extended Interest Payment Period, the Company shall pay all interest accrued
and unpaid on the Debentures, including any Additional Interest and Compounded
Interest (together, "Deferred Interest") that shall be payable to the Holders
of the Debentures in whose names the Debentures are registered in the Security
Register on the first record date after the end of the Extended Interest
Payment Period.  Before the termination of any Extended Interest Payment
Period, the Company may further extend such period, provided that such period
together with all such further extensions thereof shall not exceed 20
consecutive quarters, or extend beyond the maturity date of the Debentures.
Upon the termination of any Extended Interest Payment Period and upon the
payment of all Deferred Interest then due, the Company may commence a new
Extended Interest Payment Period, subject to the foregoing requirements.  No
interest shall be due and payable during an Extended Interest Payment Period,
except at the end thereof, but the Company may prepay at any time all or any
portion of the interest accrued during an Extended Interest Payment Period.

SECTION 4.2.  Notice of Extension.

          (a)   If the Institutional Trustee is the only registered Holder of
the Debentures at the time the Company selects an Extended Interest Payment
Period, the Company shall give written notice to the Regular Trustees, the
Institutional Trustee and the Trustee of its selection of such Extended Interest
Payment Period one Business Day before the earlier of (i) the next succeeding
date on which Distributions on the Trust Securities issued by the Trust are
payable, or (ii) the date the Trust is required to give notice of the record
date, or the date such Distributions are payable, to the New York Stock Exchange
or other applicable self-regulatory organization or to holders of the Preferred
Securities issued by the Trust, but in any event at least one Business Day
before such record date.

          (b)   If the Institutional Trustee is not the only Holder of the
Debentures at the time the Company selects an Extended Interest Payment Period,
the Company shall give the Holders of the Debentures and the Trustee written
notice of its selection of such Extended Interest Payment Period at least 10
Business Days before the earlier of (i) the next succeeding Interest Payment
Date, or (ii) the date the Company is required to give notice of the record or
payment date of such interest payment to the New York Stock Exchange or other
applicable self-regulatory organization or to Holders of the Debentures.







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          (c)   The quarter in which any notice is given pursuant to paragraphs
(a) or (b) of this Section 4.2 shall be counted as one of the 20 quarters
permitted in the maximum Extended Interest Payment Period permitted under
Section 4.1.

SECTION 4.3.  Limitation of Transactions.

          If (i) the Company shall exercise its right to defer payment of
interest as provided in Section 4.1, or (ii) there shall have occurred any Event
of Default, as defined in the Indenture, then (a) the Company shall not declare
or pay any dividend on, make any distributions with respect to, or redeem,
purchase, acquire or make a liquidation payment with respect to, any of its
capital stock (other than (i) purchases or acquisitions of shares of its common
stock in connection with the satisfaction by the Company of its obligations
under any employee benefit plans or the satisfaction by the Company of its
obligations pursuant to any contract or security requiring the Company to
purchase shares of its common stock, (ii) as a result of a reclassification of
its capital stock or the exchange or conversion of one class or series of its
capital stock for another class or series of its capital stock or, (iii) the
purchase of fractional interests in shares of its capital stock pursuant to the
conversion or exchange provisions of such capital stock or security being
converted or exchanged) or make any guarantee payment with respect thereto, (b)
the Company shall not make any payment of interest, principal or premium, if
any, on or repay, repurchase or redeem any debt securities issued by the Company
which rank pari passu with or junior to the Debentures and the Company shall not
make any guarantee payments with respect to the foregoing (other than pursuant
to the Preferred Security Guaranty).


                                   ARTICLE V
                                    EXPENSES

SECTION 5.1.  Payment of Expenses.

          In connection with the offering, sale and issuance of the Debentures
to the Institutional Trustee and in connection with the sale of the Trust
Securities by the Trust, the Company, in its capacity as borrower with respect
to the Debentures, shall:

          (a)   pay all costs and expenses relating to the offering, sale and
issuance of the Debentures, including commissions to the underwriters payable
pursuant to the Underwriting Agreement and the Pricing Agreement and
compensation of the Trustee under the Indenture in accordance with the
provisions of Section 607 of the Indenture;








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          (b)   pay all costs and expenses of the Trust (including, but not
limited to, costs and expenses relating to the organization of the Trust, the
offering, sale and issuance of the Trust Securities (including commissions to
the underwriters in connection therewith), the fees and expenses of the
Institutional Trustee and the Delaware Trustee, the costs and expenses relating
to the operation of the Trust, including without limitation, costs and expenses
of accountants, attorneys, statistical or bookkeeping services, expenses for
printing and engraving and computing or accounting equipment, paying agent(s),
registrar(s), transfer agent(s), duplicating, travel and telephone and other
telecommunications expenses and costs and expenses incurred in connection with
the acquisition, financing, and disposition of Trust assets); 

          (c)   be primarily liable for any indemnification obligations 
arising with respect to the Declaration; and

          (d)   pay any and all taxes (other than United States withholding
taxes attributable to the Trust or its assets) and all liabilities, costs and
expenses with respect to such taxes of the Trust.

SECTION 5.2     Payment Upon Resignation or Removal

          Upon termination of this Second Supplemental Indenture or the
Indenture or the removal or resignation of the Trustee pursuant to this Section
5.2, the Company shall pay to the Trustee all amounts accrued to the date of
such termination, removal or resignation.  Upon termination of the Declaration
or the removal or resignation of the Delaware Trustee or the Institutional
Trustee, as the case may be, pursuant to Section 5.6 of the Declaration, the
Company shall pay to the Delaware Trustee or the Institutional Trustee, as the
case may be, all amounts accrued to the date of such termination, removal or
resignation.


                                   ARTICLE VI
                                     NOTICE

SECTION 6.1   Notice by the Company.

          The Company shall give prompt written notice to a Responsible Officer
of the Trustee of any fact known to the Company that would prohibit the making
of any payment of monies to or by the Trustee in respect of the Debentures
pursuant to the provisions of this Article VI.  Notwithstanding the provisions
of Article Fourteen of the Indenture or any other provision of the Indenture and
this Second Supplemental Indenture, the Trustee shall not be charged with
knowledge of the existence of any facts that would prohibit the making of any
payment of monies to or by the Trustee in respect of the







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Debentures pursuant to the provisions of Article Fourteen of the Indenture,
unless and until a Responsible Officer of the Trustee shall have received
written notice thereof from the Company or a holder or holders of Senior
Indebtedness or from any trustee therefor; and before the receipt of any such
written notice, the Trustee, subject to the provisions of Section 601 of the
Indenture, shall be entitled in all respects to assume that no such facts
exist; provided, however, that if the Trustee shall not have received the
notice provided for in this Article 6 at least two Business Days prior to the
date upon which by the terms hereof any money may become payable for any
purpose (including, without limitation, the payment of the principal of (or
premium, if any) or interest on any Debenture), then, anything herein contained
to the contrary notwithstanding, the Trustee shall have full power and
authority to receive such money and to apply the same to the purposes for which
they were received, and shall not be affected by any notice to the contrary
that may be received by it within two Business Days prior to such date.

          The Trustee, subject to the provisions of Section 601 of the
Indenture, shall be entitled to conclusively rely on the delivery to it of a
written notice by a Person representing himself to be a holder of Senior
Indebtedness of the Company, as the case may be (or a trustee on behalf of such
holder), to establish that such notice has been given by a holder of such Senior
Indebtedness or a trustee on behalf of any such holder or holders.  In the event
that the Trustee determines in good faith that further evidence is required with
respect to the right of any Person as a holder of such Senior Indebtedness to
participate in any payment or distribution pursuant to this Article VI, the
Trustee may request such Person to furnish evidence to the reasonable
satisfaction of the Trustee as to the amount of such Senior Indebtedness held by
such Person, the extent to which such Person is entitled to participate in such
payment or distribution and any other facts pertinent to the rights of such
Person under this Article VI, and, if such evidence is not furnished, the
Trustee may defer any payment to such Person pending judicial determination as
to the right of such Person to receive such payment.


                                  ARTICLE VII
                          COVENANT TO LIST ON EXCHANGE

SECTION 7.1.  Listing on an Exchange.

          If the Debentures are to be issued as a Global Debenture in connection
with the distribution of the Debentures to the holders of the Preferred
Securities issued by the Trust upon a Dissolution Event, the Company will use
its best efforts to list such Debentures on the New York Stock Ex-







                                       12
   16


change, Inc. or on such other exchange as the Preferred Securities are then
listed.


                                  ARTICLE VIII
                               FORM OF DEBENTURE

SECTION 8.1.   Form of Debenture.

          The Debentures and the Trustee's Certificate of Authentication to be
endorsed thereon are to be substantially in the following forms:

                          (FORM OF FACE OF DEBENTURE)

          [IF THE DEBENTURE IS TO BE A GLOBAL DEBENTURE, INSERT - This Debenture
is a Global Debenture within the meaning of the Indenture hereinafter referred
to and is registered in the name of a Depositary or a nominee of a Depositary.
This Debenture is exchangeable for Debentures registered in the name of a person
other than the Depositary or its nominee only in the limited circumstances
described in the Indenture, and no transfer of this Debenture (other than a
transfer of this Debenture as a whole by the Depositary to a nominee of the
Depositary or by a nominee of the Depositary to the Depositary or another
nominee of the Depositary) may be registered except in limited circumstances.

          Unless this Debenture is presented by an authorized representative of
The Depository Trust Company (55 Water Street, New York, New York) to the issuer
or its agent for registration of transfer, exchange or payment, and any
Debenture issued is registered in the name of Cede & Co. or such other name as
requested by an authorized representative of The Depository Trust Company and
any payment hereon is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY A PERSON IS WRONGFUL since the registered owner
hereof, Cede & Co., has an interest herein.]

No. __________________
$_____________________
CUSIP No. ____________






                                       13
   17


                                MCN CORPORATION

                       ___% JUNIOR SUBORDINATED DEBENTURE
                                    DUE 2036

          MCN CORPORATION, a Michigan corporation (the "Company", which term
includes any successor corporation under the Indenture hereinafter referred to),
for value received, hereby promises to pay to, ______________ or registered
assigns, the principal sum of _____________ Dollars ($___________) on July 30,
2036, and to pay interest on said principal sum from September 30, 1996, or from
the most recent interest payment date (each such date, an "Interest Payment
Date") to which interest has been paid or duly provided for, quarterly (subject
to deferral as set forth herein) in arrears on March 31, June 30, September 30
and December 31 of each year commencing ___________, 1996, at the rate of ___%
per annum until the principal hereof shall have become due and payable, and on
any overdue principal and premium, if any, and (without duplication and to the
extent that payment of such interest is enforceable under applicable law) on any
overdue installment of interest at the same rate per annum compounded quarterly.
The amount of interest payable on any Interest Payment Date shall be computed on
the basis of a 360-day year of twelve 30-day months.  In the event that any date
on which interest is payable on this Debenture is not a Business Day, then
payment of interest payable on such date will be made on the next succeeding day
that is a Business Day (and without any interest or other payment in respect of
any such delay), except that, if such Business Day is in the next succeeding
calendar year, such payment shall be made on the immediately preceding Business
Day, in each case with the same force and effect as if made on such date.  The
interest installment so payable, and punctually paid or duly provided for, on
any Interest Payment Date will, as provided in the Indenture, be paid to the
person in whose name this Debenture (or one or more Predecessor Securities, as
defined in said Indenture) is registered at the close of business on the regular
record date for such interest installment, which shall be the close of business
on the business day next preceding such Interest Payment Date.  [IF PURSUANT TO
THE PROVISIONS OF THE INDENTURE THE DEBENTURES ARE NO LONGER REPRESENTED BY A
GLOBAL Debenture -- which shall be the close of business on the ____ business
day next preceding such Interest Payment Date.]  Any such interest installment
not punctually paid or duly provided for shall forthwith cease to be payable to
the registered Holders on such regular record date and may be paid to the Person
in whose name this Debenture (or one or more Predecessor Securities) is
registered at the close of business on a special record date to be fixed by the
Trustee for the payment of such defaulted interest, notice whereof shall be
given to the registered Holders of this series of Debentures not less than 10
days prior to such







                                       14
   18

 special record date, or may be paid at any time in any other lawful manner not
 inconsistent with the requirements of any securities exchange on which the
 Debentures may be listed, and upon such notice as may be required by such
 exchange, all as more fully provided in the Indenture.  The principal of (and
 premium, if any) and the interest on this Debenture shall be payable at the
 office or agency of the Trustee maintained for that purpose in any coin or
 currency of the United States of America that at the time of payment is legal
 tender for payment of public and private debts; provided, however, that
 payment of interest may be made at the option of the Company by check mailed
 to the registered Holder at such address as shall appear in the Security
 Register.  Notwithstanding the foregoing, so long as the Holder of this
 Debenture is the Institutional Trustee, the payment of the principal of (and
 premium, if any) and interest on this Debenture will be made at such place and
 to such account as may be designated by the Institutional Trustee.

          The indebtedness evidenced by this Debenture is, to the extent
provided in the Indenture, subordinate and junior in right of payment to the
prior payment in full of all Senior Indebtedness, and this Debenture is issued
subject to the provisions of the Indenture with respect thereto.  Each Holder of
this Debenture, by accepting the same, (a) agrees to and shall be bound by such
provisions, (b) authorizes and directs the Trustee on his or her behalf to take
such action as may be necessary or appropriate to acknowledge or effectuate the
subordination so provided and (c) appoints the Trustee his or her
attorney-in-fact for any and all such purposes.  Each Holder hereof, by his or
her acceptance hereof, hereby waives all notice of the acceptance of the
subordination provisions contained herein and in the Indenture by each holder of
Senior Indebtedness, whether now outstanding or hereafter incurred, and waives
reliance by each such holder upon said provisions.

          This Debenture shall not be entitled to any benefit under the
Indenture hereinafter referred to, be valid or become obligatory for any purpose
until the Certificate of Authentication hereon shall have been signed by or on
behalf of the Trustee.

          The provisions of this Debenture are continued on the reverse side
hereof and such continued provisions shall for all purposes have the same effect
as though fully set forth at this place.








                                       15
   19

          IN WITNESS WHEREOF, the Company has caused this instrument to be
executed.


Dated _____________________ 

                                                        MCN CORPORATION


                                                        By:_____________________
                                                        Name:
                                                        Title


Attest:


By: ________________________
Name:
Title:


                    (FORM OF CERTIFICATE OF AUTHENTICATION)

                         CERTIFICATE OF AUTHENTICATION

          This is one of the Debentures of the series of Debentures described in
the within-mentioned Indenture.

Dated  ____________________

  NBD BANK
   as Trustee



By________________________
   Authorized Signatory


                         (FORM OF REVERSE OF DEBENTURE)

          This Debenture is one of a duly authorized series of Securities of the
Company (herein sometimes referred to as the "Securities"), specified in the
Indenture, all issued or to be issued in one or more series under and pursuant
to an Indenture dated as of September 1, 1994, duly executed and delivered
between the Company and NBD Bank, as Trustee (the "Trustee") (as supplemented by
a First Supplemental Indenture, dated April 17, 1996, as so supplemented, the
"Base Indenture"), as supplemented by a Second Supplemental Indenture dated as
of July 24, 1996, between the Company and the Trustee







                                       16
   20

(the Base Indenture as so supplemented, the "Indenture"), to which Indenture
and all indentures supplemental thereto reference is hereby made for a
description of the rights, limitations of rights, obligations, duties and
immunities thereunder of the Trustee, the Company and the Holders of the
Securities.  By the terms of the Indenture, the Securities are issuable in
series that may vary as to amount, date of maturity, rate of interest and in
other respects as provided in the Indenture.  This series of Securities is
limited in aggregate principal amount as specified in said Second Supplemental
Indenture.

          Except as provided in the next paragraph, the Debentures may not be
redeemed by the Company prior to July 30, 2001.  The Company shall have the
right to redeem this Debenture at the option of the Company, without premium or
penalty, in whole or in part at any time and from time to time on or after July,
2001 (an "Optional Redemption"), at a redemption price equal to 100% of the
principal amount plus any accrued but unpaid interest, including any Compounded
Interest, if any, to the date of such redemption (the "Optional Redemption
Price").  Any redemption pursuant to this paragraph will be made upon not less
than 30 nor more than 60 days' notice, at the Optional Redemption Price.

          If, at any time, a Special Event (as defined below) shall occur or be
continuing after receipt of a Dissolution Tax Opinion (as defined below) and
either (a) (i) the Regular Trustees and the Company shall have received an
opinion (a "Redemption Tax Opinion") of a nationally recognized independent tax
counsel experienced in such matters that, as a result of a Tax Event (as defined
herein), there is more than a insubstantial risk that the Company would be
precluded from deducting the interest on the Debentures for United States
federal income tax purposes even after the Debentures were distributed to the
Holders of Preferred Securities and Common Securities in liquidation of such
holder's interest in the Trust as set forth in the Declaration of Trust or (ii)
the Regular Trustees shall have been informed by such tax counsel that a No
Recognition Opinion (as defined below) cannot be delivered or (b) the Regular
Trustee and the Company shall have received an opinion of an independent counsel
experienced in such matter that, as a result of a Investment Company Event (as
defined below), there is more than an insubstantial risk that MCN Financing I
would be considered an "investment company" and would be required to be
registered under the Investment Company Act of 1940, as amended (the "1940
Act"), the Company shall have the right at any time, upon not less than 30 nor
more than 60 days' notice, to redeem the Debentures in whole or in part for cash
at the Optional Redemption Price within 90 days following the occurrence of such
Special Event; provided, however, that, if at that time there is available to
the Company or the Trust the opportunity to eliminate, within





                                       17
   21

such 90 day period, the Special Event by taking some ministerial action
("Ministerial Action"), such as filing a form or making an election, or
pursuing some other similar reasonable measure, which has no adverse effect on
the Trust, the Company or the Holders of the Preferred Securities, the Company
or the Trust will pursue such measure in lieu of redemption and provided
further that the Company shall have no right to redeem the Debentures while the
Trust is pursuing any such Ministerial Action.

          "Tax Event" means that the Regular Trustees shall have received an
opinion of a nationally recognized independent tax counsel experienced in such
matters (a "Dissolution Tax Opinion") to the effect that, as a result of (a) any
amendment to, or change (including any announced prospective change) in the laws
(or any regulations thereunder) of the United States or any political
subdivision or taxing authority thereof or therein or (b) any amendment to or
change in an interpretation or application of such laws or regulations by any
legislative body, court, governmental agency or regulatory authority (including
the enactment of any legislation and the publication of any judicial decision or
regulatory determination on or after such date), there is more than an
insubstantial risk that (i) the Trust would be subject to United States federal
income tax with respect to income accrued or received on the Debentures, (ii)
interest payable to the Trust on the Debentures would not be deductible by MCN
for United States federal income tax purposes or (iii) the Trust would be
subject to more than a de minimis amount of other taxes, duties or other
governmental charges, which change or amendment becomes effective on or after
July 24, 1996.

          "Investment  Company Event" means that the Regular Trustees shall have
received an opinion from independent counsel experienced in practice under the
1940 Act to the effect that, as a result of the occurrence of a change in law or
regulation or a written change in interpretation or application of law or
regulation by any legislative body, court, governmental agency or regulatory
authority (a "Change in 1940 Act Law"), there is more than an insubstantial risk
that the Trust is or will be considered an "investment company" which is
required to be registered under the 1940 Act, as amended (the "1940 Act"), which
Change in 1940 Act Law becomes effective on or after July 24, 1996.

          Any redemption pursuant to the occurrence of a Tax Event or an
Investment Company Event (each as defined above a "Special Event") will be made
upon not less than 30 days nor more than 60 days notice, at the Optional
Redemption Price.  If the Debentures are only partially redeemed by the Company
pursuant to an Optional Redemption, the Debentures will be redeemed pro rata or
by lot or by any other method utilized by






                                       18
   22

the Trustee; provided that if, at the time of redemption, the Debentures are
registered as a Global Debenture, the Depositary shall determine the principal
amount of such Debentures held by each Debentureholder to be redeemed in
accordance with its procedures.

          In the event of redemption of this Debenture in part only, a new
Debenture or Debentures of this series for the unredeemed portion hereof will be
issued in the name of the Holder hereof upon the cancellation hereof.

          In case an Event of Default, as defined in the Indenture, shall have
occurred and be continuing, the principal of all of the Debentures may be
declared, and upon such declaration shall become, due and payable, in the
manner, with the effect and subject to the conditions provided in the Indenture.

          The Indenture contains provisions permitting the Company and the
Trustee, with the consent of the Holders of not less than a majority in
aggregate principal amount of the Debentures of each series affected at the time
outstanding, as defined in the Indenture, to execute supplemental indentures for
the purpose of adding any provisions to or changing in any manner or eliminating
any of the provisions of the Indenture or of any supplemental indenture or of
modifying in any manner the rights of the Holders of the Debentures; provided,
however, that no such supplemental indenture shall (i) reduce the principal
amount thereof, or reduce the rate or extend the time of payment of interest
thereon, or reduce any premium payable upon the redemption thereof, without the
consent of the Holder of each Debenture so affected, or (ii) reduce the
aforesaid percentage of Debentures, the Holders of which are required to consent
to any such supplemental indenture, without the consent of the Holders of each
Debenture then outstanding and affected thereby.  The Indenture also contains
provisions permitting the Holders of a majority in aggregate principal amount of
the Securities of any series at the time outstanding affected thereby, on behalf
of all of the Holders of the Debentures of such series, to waive Default or
Event of Default with respect to such series, and its consequences, except a
Default or Event of Default in the payment of the principal of or premium, if
any, or interest on any of the Securities of such series.  Any such consent or
waiver by the registered Holder of this Debenture (unless revoked as provided in
the Indenture) shall be conclusive and binding upon such Holder and upon all
future Holders and owners of this Debenture and of any Debenture issued in
exchange herefor or in place hereof (whether by registration of transfer or
otherwise), irrespective of whether or not any notation of such consent or
waiver is made upon this Debenture.





                                       19
   23

          No reference herein to the Indenture and no provision of this
Debenture or of the Indenture shall alter or impair the obligation of the
Company, which is absolute and unconditional, to pay the principal of and
premium, if any, and interest on this Debenture at the time and place and at the
rate and in the money herein prescribed.

          So long as the Company is not default in the payment of interest on
the Debentures, the Company shall have the right at any time during the term of
the Debentures from time to time to extend the interest payment period of such
Debentures for up to 20 consecutive quarters (an "Extended Interest Payment
Period"), at the end of which period the Company shall pay all interest then
accrued and unpaid (together with the interest thereon at the rate specified for
the Debentures to the extent that payment of such interest is enforceable under
applicable law).  In the event that the Company exercises this right, then (a)
the Company shall not declare or pay dividends on, make distributions with
respect to, or redeem, purchase or acquire, or make a liquidation payment with
respect to, any of its capital stock (other than (i) purchases or acquisitions
of shares of its Common Stock in connection with the satisfaction by the Company
of its obligations under any employee benefit plans or the satisfaction by the
Company of its obligations pursuant to any contract or security requiring the
Company to purchase shares of the Company's Common Stock, (ii) as a result of a
reclassification of the Company's capital stock or the exchange or conversion of
one class or series of the Company's capital stock for another class or series
of the Company's capital stock or (iii) the purchase of fractional interests in
shares of the Company's capital stock pursuant to the conversion or exchange
provisions of such capital stock or the security being converted or exchanged)
or make any guarantee payments with respect to the foregoing), (b) the Company
shall not make any payment of interest, principal or premium, if any, on or
repay, repurchase or redeem any debt securities (including guarantees) issued by
the Company that rank pari passu with or junior to such Debentures and (c) the
Company shall not make any guarantee payments with respect to the foregoing
(other than pursuant to the Preferred Securities Guarantee).  Prior to the
termination of any such Extended Interest Payment Period, the Company may
further extend the interest payment period; provided, that such Extended
Interest Payment Period, together with all such previous and further extensions
thereof, may not exceed 20 consecutive quarters or extend beyond the maturity
date of the Debenture.  At the termination of any such Extended Interest Payment
Period and upon the payment of all accrued and unpaid interest and any
additional amount then due, the Company may commence a new Extended Interest
Payment Period, subject to the above requirements.







                                       20
   24

          As provided in the Indenture and subject to certain limitations
therein set forth, this Debenture is transferable by the registered Holder
hereof on the Security Register of the Company, upon surrender of this Debenture
for registration of transfer at the office or agency of the Trustee in the City
of Detroit and State of Michigan accompanied by a written instrument or
instruments of transfer in form satisfactory to the Company or the Trustee duly
executed by the registered Holder hereof or his attorney duly authorized in
writing, and thereupon one or more new Debentures of authorized denominations
and for the same aggregate principal amount and series will be issued to the
designated transferee or transferees. No service charge will be made for any
such transfer, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in relation thereto.

          Prior to due presentment for registration of transfer of this
Debenture, the Company, the Trustee, any paying agent and the Security Registrar
may deem and treat the registered holder hereof as the absolute owner hereof
(whether or not this Debenture shall be overdue and notwithstanding any notice
of ownership or writing hereon made by anyone other than the Security Registrar)
for the purpose of receiving payment of or on account of the principal hereof
and premium, if any, and interest due hereon and for all other purposes, and
neither the Company nor the Trustee nor any paying agent nor any Security
Registrar shall be affected by any notice to the contrary.

          No recourse shall be had for the payment of the principal of or the
interest on this Debenture, or for any claim based hereon, or otherwise in
respect hereof, or based on or in respect of the Indenture, against any
incorporator, stockholder, officer or director, past, present or future, as
such, of the Company or of any predecessor or successor corporation, whether by
virtue of any constitution, statute or rule of law, or by the enforcement of any
assessment or penalty or otherwise, all such liability being, by the acceptance
hereof and as part of the consideration for the issuance hereof, expressly
waived and released.

          The Indenture imposes certain limitations on the ability of the
Company to, among other things, merge or consolidate with any other Person or
sell, assign, transfer or lease all or substantially all of its properties or
assets.  All such covenants and limitations are subject to a number of important
qualifications and exceptions.  The Company must report periodically to the
Trustee on compliance with the covenants in the Indenture.

          The Debentures of this series are issuable only in registered form
without coupons in denominations of $25 and







                                       21
   25

any integral multiple thereof.  This Global Debenture is exchangeable for
Debentures in definitive form only under certain limited circumstances set
forth in the Indenture.  Debentures of this series so issued are issuable only
in registered form without coupons in denominations of $25 and any integral
multiple thereof.  As provided in the Indenture and subject to certain
limitations therein set forth, Debentures of this series so issued are
exchangeable for a like aggregate principal amount of Debentures of this series
of a different authorized denomination, as requested by the Holder surrendering
the same.

          All terms used in this Debenture that are defined in the Indenture
shall have the meanings assigned to them in the Indenture.


                                   ARTICLE IX
                          ORIGINAL ISSUE OF DEBENTURES

SECTION 9.1.  Original Issue of Debentures.

          Debentures in the aggregate principal amount of $82,474,250 may, upon
execution of this Second Supplemental Indenture, be executed by the Company and
delivered to the Trustee for authentication, and the Trustee shall thereupon
authenticate and deliver said Debentures to or upon the written order of the
Company, signed by its Chairman, its Vice Chairman, its President, or any Vice
President and its Treasurer or an Assistant Treasurer, without any further
action by the Company.


                                   ARTICLE X
                                 MISCELLANEOUS

SECTION 10.1.  Ratification of Indenture.

          The Indenture, as supplemented by this Second Supplemental Indenture,
is in all respects ratified and confirmed, and this First Supplemental Indenture
shall be deemed part of the Indenture in the manner and to the extent herein and
therein provided.

SECTION 10.2.  Trustee Not Responsible for Recitals.

          The recitals herein contained are made by the Company and not by the
Trustee, and the Trustee assumes no responsibility for the correctness thereof.
The Trustee makes no representation as to the validity or sufficiency of this
Second Supplemental Indenture.







                                       22
   26


SECTION 10.3.  Governing Law.

          This Second Supplemental Indenture and each Debenture shall be deemed
to be a contract made under the internal laws of the State of New York, and for
all purposes shall be construed in accordance with the laws of said State.

SECTION 10.4.  Separability.

          In case any one or more of the provisions contained in this Second
Supplemental Indenture or in the Debentures shall for any reason be held to be
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provisions of this Second
Supplemental Indenture or of the Debentures, but this Second Supplemental
Indenture and the Debentures shall be construed as if such invalid or illegal or
unenforceable provision had never been contained herein or therein.

SECTION 10.5.  Counterparts.

          This Second Supplemental Indenture may be executed in any number of
counterparts each of which shall be an original; but such counterparts shall
together constitute but one and the same instrument.







                                       23
   27

          IN WITNESS WHEREOF, the parties hereto have caused this Second
Supplemental Indenture to be duly executed, and their respective corporate seals
to be hereunto affixed and attested, on the date or dates indicated in the
acknowledgements and as of the day and year first above written.

                                            MCN CORPORATION
                                                 
                                                 
                                            By /s/ Sebastian Coppola
                                               -----------------------
                                            Name: Sebastian Coppola
                                            Title: Vice President and Treasurer



Attest:


By: /s/ Daniel L. Schiffer
   ------------------------
   Daniel L. Schiffer
   Senior Vice President                               NBD BANK
   General Counsel and                                 as Trustee
   Secretary

                                                       By /s/ James D. Khami
                                                         ----------------------
                                                       Name: James D. Khami
                                                       Title: Trust Officer

Attest:

By: /s/ Richard J. McCullen
   ---------------------------
   Richard J. McCullen