I've got to test a bunch of temporary electrical distribution boxes (see photo example) for an events company I work with. I've done this many times before and have no issue with the actual testing. However, normally I would do it on the bench with a non-RCD'd supply so as I can test and record RCD trip times for each RCD or RCBO individually. Unfortunately I'm having to perform the testing on site, where ALL supplies are protected by 30mA RCD's, which means there is no discrimination between devices and when testing, can trip both or just the upstream RCD rather than the one I'm testing.
I've heard about using a 230v/230v transformer to separate the primary and secondary side RCD's. However I'm unsure of the type of transformer required for this...
Surely a 230v separating transformer, having no secondary side connection to earth, would not allow an RCD to trip?
Does anyone have any ideas or links to solutions that would work in this situation?
There will be no load whilst testing so I was just going to use a 13A plug top, jumped up to 3ph ceeform with the phases linked, I just need a way of separating the RCD's...
TIA
I've heard about using a 230v/230v transformer to separate the primary and secondary side RCD's. However I'm unsure of the type of transformer required for this...
Surely a 230v separating transformer, having no secondary side connection to earth, would not allow an RCD to trip?
Does anyone have any ideas or links to solutions that would work in this situation?
There will be no load whilst testing so I was just going to use a 13A plug top, jumped up to 3ph ceeform with the phases linked, I just need a way of separating the RCD's...
TIA