a/c isolators

[oddjob]

Installing on 3phase 4 strings of 10 pnls d/c isolator to each string, with sring fuses, how many a.c islators would i need, would i just need the normal two one at invertor and one at c/unit with the meter.
many thanks for anybodys help OJ

 

[Morgan keith]

Yeah you need 1 x 3 phase AC isolator next to the inverter and one next to the meter. As far as I understand,the 2nd isolator only needs to be installed next to the meter if the meter isn't installed besides the CU where the circuit breaker is, as it's only a precaution so that someone else doesn't re-energise the circuit while you're working on the meter.

 

[SolarCity]

The isolator needs to be lockable in the off position. The CU is unlikely to have this function on it's individual breakers.