High Zs on C32 RCBOs
This ones got me scratching my head, I’ve been to a friends business to carry out an EICR as they’ve had a few issues on a 1 yr old NAPIT certed install.
I wasn’t able to do any dead testing as it’s a business, I’ll have to go back after hours or on the w/end.
It’s an office but for some reason the whole board is populated with C curve RCBOs.
I took a few readings and immediately got 0.9-1.55 on the rings which should be max 0.55
Im hoping its down to loose connections but I’m worried in the event it isn’t if ill be able get those values within range. Can we rely on the RCD for fault protection here and c3 or is it a case of changing breakers for Bs and trying to get those zs within range of 1.09 in the rings?