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Discuss MK 63amp RCD that fails Ix5 test everything else tests fine on the board in the Electrical Forum area at ElectriciansForums.net

stuarth

Regular EF Member
I have a brand new MK 63amp RCD that fails Ix5 test everything else tests fine on the board, I tested with all circuits off everything unplugged so swapped it for another thinking must have a faulty one but the same result, it will trip at 50ms and ramp tested at 33ma, ze=0.18 what could be happening? any advice on what could be wrong would be greatly appreciated.
 
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Strima

Electrician's Arms
What’s the RCD mA rating?
 

westward10

In echoed steps I walk across an empty dream.
Staff member
Moderator
You are isolating it from any other influence, just switching off the protective devices only eliminates the line conductors.
 

stuarth

Regular EF Member
Assuming isolating the neutral works what do I do to correct it? there are two existing RCBOs on the board which work well within the regs which I disconnected to test if influencing the RCD, they did not.
and you have left a fault rcd,tut tut.
not sure how much more dangerous a RCD tripping 10ms slower is but will be going back armed with more knowledge and tips on correcting it.
 
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Vortigern

Regular EF Member
Could it possibly be partial hysterisis of the toroidal coil? Maybe there is some DC current causing this??? Maybe you need an A type instead of AC, just a stab in the dark there....
 

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