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Any thoughts on this old thing?

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timhoward

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Quite old main switch RCD, it occasionally trips (every day or two), then won't turn on until all breakers are off.
Ramp test at time of testing was 25ma, earth leakage meter said 5ma (so consistent).
Is the RCD likely to simply be old?! Are they tetchy switching on under load?

Haven't got into IR testing yet. Their initial enquiry was for a CU change so a DP RCBO board will likely solve all issues or worst case show up anything that has intermittent faults.

[ElectriciansForums.net] Any thoughts on this old thing?

[ElectriciansForums.net] Any thoughts on this old thing?
 
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westward10 said:
the sharpie marks on the ring finals weren't necessary, don't like sharpie marks.
Click to expand...
I'm always happy to learn new tricks. What do others do? Mark cable sheaths where visible? Cable marker clips? Trust you keep them in same order?
My old gaffer used to put nicks in the cables which I never liked!

The number of times I find one leg of a ring swapped with an immersion heater has left with me no qualms about leaving future electricians clues! But I'm open to better ways.
 
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I'm a shameless Sharpie charlatan. But I agree it looks ugly. I have used tape 'flags' and marked the tape with a Sharpie, but they are prone to coming off the cables when the old fuse box is removed.
 
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Hate when peoplle nick the cable , some older sparks I worked with did this and to me was just rough house...

a white tape flag and write on on in biro when doing board swaps was probably me go to, or a little dyno lable
 
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timhoward said:
I'm always happy to learn new tricks. What do others do? Mark cable sheaths where visible? Cable marker clips? Trust you keep them in same order?
My old gaffer used to put nicks in the cables which I never liked!

The number of times I find one leg of a ring swapped with an immersion heater has left with me no qualms about leaving future electricians clues! But I'm open to better ways.
Click to expand...
Three rings, cut the ends off one, leave one as it was and strip longer ends on the other.
 
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westward10 said:
Three rings, cut the ends off one, leave one as it was and strip longer ends on the other.
Click to expand...
Simple and rather obvious now! And fold over the end on the immersion...you've got me thinking how many patterns this approach could make....
 
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nicebutdim said:
Not familiar with that old incomer and didn't want to assume busbar connection to it, but lettering appeared to show 'L' above left terminal.
Click to expand...
I had a look this morning. I have to say, MEM made it about as idiot proof as possible!

[ElectriciansForums.net] Any thoughts on this old thing?

Even told us how to put wires in it!
[ElectriciansForums.net] Any thoughts on this old thing?
 
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timhoward said:
I'm always happy to learn new tricks. What do others do? Mark cable sheaths where visible? Cable marker clips? Trust you keep them in same order?
My old gaffer used to put nicks in the cables which I never liked!

The number of times I find one leg of a ring swapped with an immersion heater has left with me no qualms about leaving future electricians clues! But I'm open to better ways.
Click to expand...
If all the rings tested out before the board swap then it's just a case of a quick continuity test to put the rings back together. No sharpies or flags required.

They're tests you have to do anyway.
 
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Mark42 said:
Not sure about that 3 - 1- 2 on the RFCs :)
What's that all about?
Click to expand...
The marks were put on before I dismantled the old board, before I proved end to end continuity and before I proved there were no inter-connections. I do this if it’s a shared RCD or no RCD as a record of how it was installed.
Just a little insurance policy really.

I’ve had a house once where some highly creative smoke alarm wiring was linking most circuits together. Live from light switch, N from nearest socket etc, and the immersion and the kitchen ring were also involved as well as a link back to a lighting circuit at the CU.
After that rather horrendous diagnostic experience I tend to mark the original position of the 2.5’s.
 
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