FIRST AMENDMENT TO
                          AGREEMENT AND PLAN OF MERGER

                  FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER, dated as of
March 30, 1998 (this "Amendment"), to the Agreement and Plan of Merger, dated as
of February 23, 1998, as amended as of the date hereof (the "Merger Agreement"),
among DYCOM INDUSTRIES, INC., a Florida corporation ("Parent"), DYCOM
ACQUISITION CORPORATION I, a Missouri corporation and a wholly owned subsidiary
of Parent ("Merger Sub"), INSTALLATION TECHNICIANS, INC., a Missouri corporation
(the "Company"), and the stockholders of the Company listed on the signature
pages hereto (collectively, the "Stockholders").

                  WHEREAS, the parties hereto are parties to the Merger
Agreement (capitalized terms not defined herein have the meanings ascribed to
them in the Merger Agreement); and

                  WHEREAS, the parties hereto desire to amend the Merger
Agreement;

                  NOW THEREFORE, in consideration of the premises and of the
mutual agreements and understandings hereinafter set forth, the parties hereto
hereby agree as follows:

                  SECTION 1. Amendment to Merger Agreement. The Merger Agreement
is hereby amended by deleting the date "December 28, 1996" in the first sentence
of Section 4.08 and inserting in lieu thereof the date "December 27, 1997".

                  SECTION 2. Effect of Amendments. Except as and to the extent
expressly modified by this Amendment, the Merger Agreement shall remain in full
force and effect in all respects.

                  SECTION 3. Governing Law. This Amendment shall be governed by,
and construed in accordance with, the laws of the State of Delaware applicable
to contracts executed in and to be performed in that State.

                  SECTION 4. Counterparts. This Amendment may be executed and
delivered (including by facsimile transmission) in one or more counterparts, and
by the different parties hereto in separate counterparts, each of which when
executed shall be deemed to be an original but all of which taken together shall
constitute one and the same agreement.




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                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed on their behalf as of the date first written above.


                                              DYCOM INDUSTRIES INC.



                                              By /s/ Thomas R. Pledger
                                                -----------------------------
                                              Name:  Thomas R. Pledger
                                              Title: Chairman and CEO


                                              DYCOM ACQUISITION CORPORATION I



                                              By /s/ Thomas R. Pledger
                                                -----------------------------
                                              Name:  Thomas R. Pledger
                                              Title: Chairman of the Board


                                              INSTALLATION TECHNICIANS, INC.



                                              By /s/ Gerald W. Hartman
                                                -----------------------------
                                              Name:  Gerald W. Hartman
                                              Title: Chief Executive Officer


                                              STOCKHOLDERS:


                                              /s/ Thomas E. Atkins
                                                -----------------------------
                                              Name:     Thomas E. Atkins
                                              Address:  3909 West Broadway
                                                        Columbia, MO 65203




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                                            /s/ Gerald W. Hartman
                                              -----------------------------
                                            Name:     Gerald W. Hartman
                                            Address:  139 Schooner Bay Landing
                                                      Kimberling City, MO 65686


                                            /s/ John J. Ekstrom
                                              -----------------------------
                                            Name:     John J. Ekstrom
                                            Address:  1525 N.W. 121 Drive
                                                      Coral Spring, FL 33071