Thomas & Betts (TNB) 10-Q 2012 Q1 Quarterly report

Exhibit 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO RULE 13a-14(b) OR RULE 15d-14(b)

OF THE SECURITIES EXCHANGE ACT OF 1934 AND 18 U.S.C. §1350

The certification set forth below is being submitted in connection with theQuarterly Report on Form 10-Qfor the quarterly period ended March 31, 2012 (the “Report”) for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and 18 U.S.C. § 1350.

William E. Weaver, Jr., the Chief Financial Officer of Thomas & Betts Corporation (the “Corporation”), certifies that, to the best of his knowledge:

1. the Report fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

/s/    WILLIAM E. WEAVER, JR.

William E. Weaver, Jr.

Senior Vice President and Chief Financial Officer

(Principal Financial Officer)

Dated this 7th day of May, 2012.