AN A320 PLT RPTS THAT A GND SVC PERSON ATTEMPTED TO APPLY ELECTRICAL PWR TO AN ACFT AFTER THE FLT CREW DIRECTED HIM NOT TO BECAUSE OF A PRIMARY ELECTRICAL SYS MALFUNCTION.

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DURING THE CRUISE PHASE OF FLT THE ACFT EXPERIENCED A 'TRIPPED CIRCUIT BREAKER; T31.' UPON REACHING THE GATE AND SHUTTING DOWN ENG #2; THE AC BUS #2 FAILED TO XFER PWR SOURCE FROM GENERATOR #2 TO GENERATOR #1. THE RESULTING SCENARIO WAS A DARK PAX CABIN; LOSS OF SEVERAL NORMAL ELECTRICAL SYS AND ENG #1 GOING TO HIGH IDLE. EMER LIGHTING WAS UTILIZED FOR PAX DEPLANING. ALL ATTEMPTS TO RE-POWER AC BUS #2 WERE UNSUCCESSFUL. A RAMPER CAME TO THE COCKPIT REQUESTING WE CONNECT THE GND PWR; SO HE COULD OPEN THE BAGGAGE DOORS. WE TRIED TO EXPLAIN THAT THE ACFT HAD EXPERIENCED AN ELECTRICAL MALFUNCTION AND IT WOULD NOT BE POSSIBLE TO CONNECT THE GPU. A FEW MINS LATER; WHILE THE PAX WERE STILL DEPLANING AND THE FO WAS STILL IN HIS SEAT; THE RAMPER ACCESSED THE COCKPIT AND WHILE HE WAS BEING TOLD TO NOT TOUCH ANYTHING PROCEEDED TO PUSH THE GPU SWITCH. WHEN THIS FAILED; HE PUSHED THE APU PWR SWITCH. WHEN HE WAS QUERIED WHY WAS HE DISREGARDING SPECIFIC INSTRUCTIONS FROM A FLT CREW THAT WAS STILL TRYING TO DEAL WITH THE SITUATION AND HAVING HAD THE OPPORTUNITY TO EXPLAIN TO HIM THAT ELECTRICAL PWR WAS NOT AVAILABLE HIS EXPLANATION WAS THAT HE WAS 'QUALIFIED TO OPERATE THE ACFT.' MAYBE IT WAS THE DESIRE OF THE RAMPER TO OPEN THE DOORS; SO OUR DELAYED PAX COULD HAVE THEIR BAGS; BUT IN THIS CASE IT BACKFIRED. IN CLOSING; A GND PERSONNEL INDIVIDUAL DISREGARDED SPECIFIC INSTRUCTIONS FROM A FLT CREW MEMBER; AND PROCEEDED TO MANIPULATE ACFT SYS WITH COMPLETE DISREGARD OF SAFETY AND WELLBEING OF OTHER EMPLOYEES; CUSTOMERS AND COMPANY PROPERTY.