RCD's on 3 phase socket outlets

[BobB]

Have you tried a surge diverter?

 

[Gil47]

daba

My suggestion about your RCD tripping is that somewhere down stream of the RCD, within your installation, you have an appliance with a MOV surge protector that starts conducting when it sees the spike from those lights turning off.

I know we are having problems getting mutiplug units with surge suppression built in,
The megger test is starting the 275 volt MOV conducting hence a test fail.

A unit with the MOV , Phase to N and Phase to E may be your issue.

 

[BryanG]

I don't have a copy of the regs to hand to know if this is bang up to date. Look on page 2, top left corner. These aren't regulations regarding manufacture of RCDs but regulations covering testing of RCDs.

http://www.winterselectrical.co.uk/...df?PHPSESSID=ceb58167ad9f252bb4aebcb4da1d9a89

 

[daba]

daba

My suggestion about your RCD tripping is that somewhere down stream of the RCD, within your installation, you have an appliance with a MOV surge protector that starts conducting when it sees the spike from those lights turning off.

I know we are having problems getting mutiplug units with surge suppression built in,
The megger test is starting the 275 volt MOV conducting hence a test fail.

A unit with the MOV , Phase to N and Phase to E may be your issue.

Well yes, but isn't that what the MOV is there for. The spike shouldn't be there in the first place.

So what do I have to do? Unplug all my appliances every night between 11:00 and 11:30pm so that my RCD doesn't trip?!? Not the answer to the problem really is it....