Insulation resistance testing - RCBO
- Thread starter Dambo
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PC Electrics
Well-known member
The circuit 'tails' should be disconnected from RCBOs during IR testing to prevent false readings from and damage to the electronics inside the RCBO.
RCD's should be off as well......
Risteard
Senior Member
An RCBO is an RCD.
Risteard
Senior Member
Actually, an RCCB, RCBO and sRCD are all types of RCD.No, an RCBO is an RCD and MCB combined. I know what you're saying, just avoiding confusion for other viewers.
Whilst an RCBO does indeed have integral overcurrent protection, it is in fact an RCD.
I have some study material though that says, when carrying out insulation resistance testing, the RCDs and MCBs are to be switched on but RCBOs are to be switched off. I know an RCBO is an RCD and MCB combined, that's why i'm confused!
PC Electrics
Well-known member
Some RCDs should be disconnected also - it's usually in the manufacturers instructions and is usually the ones with the flying earth lead (MEM and MK for example). On a conventional RCD you should usually be testing on the load side and so the RCD would be off, but can remain connected. It does somewhat depend upon the situation and what you're testing.
