EXHIBIT 32.2

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of WESCO International, Inc. (the
"Company") on Form 10-Q for the period ended September 30, 2004 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), each
of the undersigned, in the capacities and on the dates indicated below, hereby
certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1.    The Report fully complies with the requirements of Section 13(a) or 15(d)
      of the Securities Exchange Act of 1934; and

2.    The information contained in the Report fairly presents, in all material
      respects, the financial condition and results of operation of the Company.

      Date: November 8, 2004     By:  /s/ Stephen A. Van Oss
                                     -------------------------------------------
                                      Stephen A. Van Oss
                                      Senior Vice President, Chief Financial and
                                          Administrative Officer