What has Zs
Aw right, will have to get my head round that, nice one. Where I was going with ZS scenario sounded right in my mind but hey ho potatas/potatoes , u learn something new every day :rolleyes:

Will an MCB operate at 30ma!

The RCD is being used for additional shock protection due to failure of basic protection/carelessness of user etc. it should operate before the end user receives a fatal shock.

The MCB offers protection to the cable.
 
( Was beginning to wonder if weirdness was a feature of supply,(and suggest testing elsewhere))
Finger points at shabby product ,nearly good enough !
 
What has Zs


Will an MCB operate at 30ma!

The RCD is being used for additional shock protection due to failure of basic protection/carelessness of user etc. it should operate before the end user receives a fatal shock.

The MCB offers protection to the cable.

Yes when you put it like that it all makes sense now. Feel rather sheepish now tbh to have made such a daft assumption. I mean the ZS itself wont affect the trip time will it :oops:. Will be reading up again on this subject and nail it.
 
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Odd test results on RCD Spur
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