SEC Form 4 
FORM 4	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 	  
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	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).			
1. Name and Address of Reporting Person*
PARRETTE LESLIE J	

(Last)	(First)	(Middle)	
SUITE 700	
225 WEST STATION SQUARE DRIVE	

(Street) 
PITTSBURGH	PA	15922	

(City)	(State)	(Zip)	
	2. Issuer Name and Ticker or Trading Symbol 
WESCO INTERNATIONAL INC [ WCC ] 	5. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
	Director		10% Owner	
X	Officer (give title below)		Other (specify below)	
Sr. VP, Legal Affairs	
		
	3. Date of Earliest Transaction (Month/Day/Year)
07/01/2009 		
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) 
X	Form filed by One Reporting Person	
	Form filed by More than One Reporting Person	
	
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned	
1. Title of Security (Instr. 3) 	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8) 	4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 	5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	7. Nature of Indirect Beneficial Ownership (Instr. 4) 	
			Code	V	Amount	(A) or (D)	Price				
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 3) 	2. Conversion or Exercise Price of Derivative Security 	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8) 	5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 	6. Date Exercisable and Expiration Date (Month/Day/Year)	7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 	8. Price of Derivative Security (Instr. 5) 	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	11. Nature of Indirect Beneficial Ownership (Instr. 4) 	
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares					
Stock Appreciation Rights	$25.37 	07/01/2009		A		17,940		(1) 	07/01/2019	Common Stock	17,940	$0.00 	17,940	D		
Restricted Stock Units	(2)	07/01/2009		A		675		(3) 	(3) 	Common Stock	675	$0.00 	675	D		
Explanation of Responses:	
1. The Stock Appreciation Right becomes exercisable in three (3) equal, annual installments beginning on the first anniversary of the date of grant.	
2. Each Restricted Stock Unit represents a contigent right to receive one share of WESCO Common Stock.	
3. The Restricted Stock Units vest in three years from the date of the grant.	
Remarks:	
	
	/s/ Marcy Smorey-Giger	07/06/2009	
	** Signature of Reporting Person	Date	
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).	
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.	
        WESCO INTERNATIONAL, INC.
INSIDER TRADING POLICY

POWER OF ATTORNEY
FOR EXECUTING FORMS 3, 4 AND 5

October 2008

        KNOW ALL BY THESE PRESENT, that the undersigned hereby constitutes and appoints
each of Daniel A. Brailer, Marcy Smorey-Giger and Nancy M. Stiles, signing
singly, his/her true and lawful attorney-in-fact to:

(1)     execute for and on behalf of the undersigned Forms 3, 4 and 5, and
amendments thereto, in accordance with Section 16 of the Securities Exchange Act
of 1934, as amended, and the rules thereunder;

(2)     do and perform any and all acts for and on behalf of the undersigned that
may be necessary or desirable to complete the execution of any such Forms 3, 4
or 5, or amendment thereto, and the filing of such form with the United States
Securities and Exchange Commission and any other authority; and

(3)     take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in
his/her discretion.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or his/her
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted.  The
undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are not assuming any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934,   as amended.

This power-of-attorney shall expire when the undersigned ceases to be required
to file Forms 3, 4 and 5 with the United States Securities and Exchange
Commission or any other authority.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 11th day of March, 2009.
                                                /s/Leslie J. Parrette, Jr.                                                      Signature
                                                   Leslie J. Parrette, Jr.
State of Pennsylania    )
                        )  ss.
County of Allegheny     )

                Sworn to before me this 11th day of March, 2009.
                                                /s/ William W. Cline II
                                                William W. Cline II                                             Notary Public

My Commission expires May 14, 2012