Nuisance tripping.

[The Ghost]

Could be loose connections upstream of consumer unit. Have you done a ramp test?

 

[Wilko]

Hi - if the IR tests are “in the meg Ohms” then it’s likely to be attached equipment. Perhaps turn everything on (plus boiler) and ramp test the tripping RCD. If it now trips below 15mA, start unplugging.

 

[Charlie_]

If they have an induction hob then start with that.

 

[sparksfly]

Hi - I second ramp test....however....one recent upgrade had the same issue, all tests ok. had customer to unplug anything not in use, tested all appliances...narrowed it down to possibly a cooker fault (still too random to actually id the fault ) new cooker, no issues. Sometimes it is not always black and white. Why not try another rcbo and move a circuit off the main RCD.

 

[Octopus]

Several things spring to mind:

That IR reading is far too low for new wire
Did you wire it or just test it
Do you know which circuit has the low reading
Why a big dual board in a new home
Have you ramp tested the rcds
Could you reconfigure the board for rcbo's
Do you have outside circuits

Etc etc

 

[telectrix]

Several things spring to mind:

That IR reading is far too low for new wire
Did you wire it or just test it
Do you know which circuit has the low reading
Why a big dual board in a new home
Have you ramp tested the rcds
Could you reconfigure the board for rcbo's
Do you have outside circuits

Etc etc

think OP's remit was a CU change.

 

[Octopus]

think OP's remit was a CU change.

Not how I read the opening sentence

 

[telectrix]

I read post #3 where he mentioned "existing circuit"

 

[Octopus]

I read post #3 where he mentioned "existing circuit"

True, so it's a partial rewire and a new board ..

Fingers crossed the op will come back and update us

 

[Dustydazzler]

This thread is a huge advert for RCBO boards

 

[richy3333]

If you talked through with the customer about their choices re RCBO and RCD CU's and explained how situations like this can occur (nuisance tripping/earth leakage) I dont think you owe them anything unless they want you to investigate at their cost.

If on the other hand you didn't talk through options then they are going to blame your work so you'll need to find the faulty appliance/fault at your cost.

Previous advice is as ever, great.

Good luck.

 

[Octopus]

This thread is a huge advert for RCBO boards

I don't understand why anybody fits dual boards any more

 

[Charlie_]

I don't understand why anybody fits dual boards any more

10 way split board, fully loaded £60

 

[Dustydazzler]

10 way split board, fully loaded £60

For the extra £50 for rcbo it’s a no brainer

 

[Dustydazzler]

.

 

[DPG]

.

Good point.

 

[Charlie_]

@Dustydazzler
10 way board fully loaded with RCBOs for £110?
Please post up a link

 

[Dustydazzler]

@Dustydazzler
10 way board fully loaded with RCBOs for £110?
Please post up a link

£110 will get you about 6 or 7 rcbos + board

 

[Charlie_]

£110 will get you about 6 or 7 rcbos + board

So it works out cheaper to buy RCBOs as a CU package and just put the CUs to one side.

 

[Octopus]

10 way split board, fully loaded £60

And serious hassle when it starts tripping ...