Discuss Type A RCDs Vs Type AC in the Electrical Forum area at ElectriciansForums.net

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The reason we should install DP (switched neutral) RCBOs in a TT system is only when an up-front RCD (100mA S Type) is installed so that we achieve selectivity and avoid nuisance tripping from a neutral - earth fault which would then trip the up-front RCD in fault conditions.
 
How many of us own the appropriate DC RCD tester to test Type A RCDs?

You'd hope everyone who needs one does, though this is unlikely to be the case.

My MFT (Megger 1730) is capable of testing types AC, A and B RCDs and I think most common testers are capable of AC and A type.
 

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