A CANADAIR CL65 WAS DISPATCHED IN NON COMPLIANCE WITH #2 GENERATOR DEFERRED INOP PER THE MEL USING THE WRONG REF AND SPECIAL PROCS.

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WHILE ON A CONTINUOUS DUTY TRIP TO ZZZ; UPON REACHING ACFT FOR THE MORNING RETURN FLT TO CVG; I DISCOVERED THAT THE INTEGRATED DRIVE GENERATOR (IDG) HAD BEEN DEFERRED THE PREVIOUS NIGHT DUE TO AN IDG CAUTION MESSAGE. THE PREVIOUS CREW HAD PERFORMED THE QRH PROC WHICH INCLUDED DISCONNECTION OF THE IDG FOR THE #2 ENG. THE IDG WAS DEFERRED (I DON'T KNOW BY WHOM)/(MAINT CTL) PER THE PROPER MEL (24-11-1); BUT THE WRONG SUB-PART OF THE MEL WAS USED; WHICH IS PART B WHICH REFERS TO THE GENERATOR PORTION OF THE IDG. THE SYS SHOULD HAVE BEEN DEFERRED BY 24-11-1 SUB-PART A; WHICH REFERS TO THE CONSTANT SPD DRIVE PORTION OF THE IDG. I REVIEWED THE MEL AND REFED THE CL65 FLT STANDARDS MANUAL FOR THE MEL (24-11-1) OPERATING PROCS (AS WELL AS THE 6 OTHER MEL'S ON THIS). UNFORTUNATELY; I DID NOT REALIZE THAT THE WRONG SUB-PART OF THE MEL WAS USED. INFLT; I REVIEWED THE MEL AGAIN WITH THE FO; AND REALIZED THE ERROR. THE FO HAD MENTIONED; AFTER PUSHBACK; THAT HE THOUGHT THE SUB-PART (B) OF THE MEL; MIGHT HAVE BEEN WRONG. WE REVIEWED THE SYS AND DETERMINED THAT AT THAT POINT THE MEL WAS PROPER. I BELIEVE THE CONTRIBUTING FACTORS TO THIS SIT WERE THE HIGH NUMBER OF MEL'S FOR THIS ACFT; (A VERY HIGH NUMBER OF MEL'S IS COMMON FOR OUR FLEET) THE IMPROPER DEFERRAL OF THIS ITEM BY MAINT CTL; WHICH WE ARE SEEING A LOT OF.