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Discuss Nuisance tripping. in the Electrical Forum area at ElectriciansForums.net

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Hi all,
I’ve just completed a large house re/ new wire with new 15 circuit split MK board.
Test is fine but have low IR on some circuits, board randomly trips rcd on one side no pattern.
Its a big house lots of tech plugged in etc, so I’m thinking update from B to C type mcbs Incase it’s an inrush issue on one of the circuits but I’m open to suggestions???

Thanks .
 
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Charlie_

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Arms
Changing b to c will have no relevance to the RCD tripping.

Changing MCBs to RCBOs would make sense though.

By low IR reading, what are the actual readings?
 

Charlie_

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Arms
I take it you mean 8.8 Mohm?
That is totally fine
Do you have an earth leakage clamp?

What’s your split like on the board?
Well balanced out?
 
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  • #5
I take it you mean 8.8 Mohm?
That is totally fine
Do you have an earth leakage clamp?

What’s your split like on the board?
Well balanced out?
No don’t have earth leakage clamp, the board is high in Mcb ratings but fairly evenly split.
 
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  • #7
Is it only tripping the RCD with equipment plugged into sockets?
It’s hard to say as they have a lot of hard wired equipment I can’t get at, boiler, fridge Frezzer, etc, I’ve told them it’s something they have connected to the circuits or plugged in that they need to eliminate
 

richy3333

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Mentor
Arms
Supporter
Esteemed
It’s hard to say as they have a lot of hard wired equipment I can’t get at, boiler, fridge Frezzer, etc, I’ve told them it’s something they have connected to the circuits or plugged in that they need to eliminate
How can you tell 'them' that when you have done little I&T to establish the fault - from what you have said so far? Possibly is an appliance or combination but more work needed to identify this?
 
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  • #10
Why do you think 8.8Mohm IR could be having an effect on this? Have you calculated the leakage current that will flow due to this value?
Hi, no I don’t thing it’s an issue I was just giving the details about the test. No I’ve not calculated the earth leakage, I’m fairly new to this so I know far from everything and hope to pick up on the knowledge from this forums.
 

Charlie_

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Arms
You should invest in an earth leakage clamp, most wholesalers will have them in.
You must have unplugged everything when you done your IR tests? Or that lower reading could be misleading.
 
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  • #12
How can you tell 'them' that when you have done little I&T to establish the fault - from what you have said so far? Possibly is an appliance or combination but more work needed to identify this?
Hi , I’ve tested the whole installation and rechecked all the fixed wiring, and found no issues.
 
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  • #14
You should invest in an earth leakage clamp, most wholesalers will have them in.
You must have unplugged everything when you done your IR tests? Or that lower reading could be misleading.
Yes everything was unplugged and usb built in sockets was bypassed
 

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