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Got sent this, RCD Failed x1 greater than 300ms maybe if they changed the supply at top of RCD, currently have neutral on the left and line in the right , also the RCD is fed from 63Amp MCB is that all good just feeding an RCBO 30ma board
 

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that's a time delay RCD. and MK RCDs are generally L on right.
 
read mylast post.MK RCDs are normaally that way round.
 
read here:
https://---------------/forums/forum/messageview.cfm?catid=205&threadid=42247
 
Hi - does it trip on the test button or when ramped?
Just FYI, Table 3A has the range of values for 100mA RCDs (and others), non-delayed up to 300ms and S up to 500ms.
 
Who sent you the picture? What was the reason for their visit?
 
Hi guys, my mate sent me it and it’s an upfront RCD for DB in a farm yard (TT) he went through how he tested it as he has brand new tester (Martindale) a similar version to mine and he didn’t flick through the settings and put S which is time delayed, hence why it was saying failed X1 eventually tripped at 310ms so all good
 

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