DC9-10 CREW HAD VARIOUS ELECTRICAL FAILURES AND PRESSURIZATION PROBS IN ZOB CLASS A.

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LEVEL FL350. CABIN BEGAN UNCTLED CLB. CAPT AND FO DONNED OXYGEN MASK; DID CABIN PRESSURIZATION LOSS CHK AND ATTEMPTED TO DECLARE EMER WITH ATC AND BEGAN EMER DSCNT. UNABLE TO TALK WITH ATC ON COM #1 AND #2; SELECTED EMER PWR AND REGAINED COM #1. DECLARED EMER AND SQUAWKED 7700. BEGAN EMER DSCNT CHK AND REGAINED CTL OF CABIN. CONTINUED DSCNT AND BEGAN DIVERSION. ADVISED FLT ATTENDANT; ATC AND COMPANY. WAS ADVISED BY FLT ATTENDANT SOME CABIN LIGHTING HAD GONE OUT BUT STANDBY LIGHTING AVAILABLE THROUGH EMER PWR. WE NOW HAD VARIOUS ANNUNCIATOR LIGHTS ILLUMINATED BUT NOTHING TO INDICATE ANY TOTAL BUS FAILURE OR GENERATOR PROBS. WHILE BEING VECTORED FOR ILS UNCERTAIN OF NAV CAPABILITIES SINCE WE HAD NOT YET ACQUIRED ILS SIGNAL OR IDENT; REQUESTED VFR RPTING ARPTS OR POSSIBILITY OF PAR APCH TO DIVERSION ARPT DUE TO WX (700 FT TAXI). FINALLY RECEIVED GOOD ILS SIGNAL. DURING DSCNT AND APCH; CAPT'S WINDSHIELD ICED OVER AND DID NOT HAVE FULL ICE PROTECTION CAPABILITY OF ACFT; ACCOMPLISHED DSCNT; APCH AND LNDG CHKS; LANDED SUCCESSFULLY. WAS ABLE TO CLR RWY AND REQUESTED ARFF TO DO EXTERIOR VISUAL INSPECTION OF ACFT AND RECEIVED ALL CLR. REQUESTED ACFT TO BE TOWED TO GATE; PAX REMAINED ON BOARD UNTIL PARKED AT GATE. MAINT BELIEVES WE HAD LOST 2 OF 3 PHASES ON L AC BUS; AS ALL ITEMS INOP WERE COMMON TO L AC BUS.