RCD Test failure question

[MatttB]

Based on those test results it appears that the RCD has indeed failed testing.
I agree with the C2 code, but the price of £200 just to replace an RCD seems a bit steep to me.
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The test results show the RCD appears to protect all circuits and has failed testing.
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Because that is what the tester will have displayed when the RCD failed to trip in less than 300mS and 40mS.

Personally I would probably put an X in the box for a failure but the software used may not allow that.

Thanks Dave... Any idea why the RCD would have deteriorated since previous test? I have attached the previous report...
Thanks for your opinion

 

[westward10]

The old schedule indicates the consumer unit is dual rcd have they both failed. The two schedules don't tally with each other.

 

[MatttB]

What make is the consumer unit.

I don’t know. The paperwork I have just describes it as a dual RCD 5+5 MCB Type 2.. it was installed in 2014...

 

[Julie.]

Agree with the above, I assume you have a single RCD for the whole board, it looks like this needs replacing so a valid observation C2.

Sorry just noticed that you say dual RCD - it would be unusual for both to go.

Could you take a photo of the CU from the front - ideally with the cover up so we can see the MCBs/RCDs

As for cost, that is quite expensive for most units, but depending on the consumer unit ("Fuse board") make, could well be reasonable

 

[davesparks]

Thanks Dave... Any idea why the RCD would have deteriorated since previous test? I have attached the previous report...
Thanks for your opinion

That changes things significantly, the original certificate clearly shows that there are two RCDs. The new report suggests that there is only one.
I seriously doubt that both RCDs have failed, one failure is rare but possible.

I would contact the person who did the report and ask them which of the two RCDs failed, or if it was both. I would also ask them if they tripped when the test button was pressed.

If you can access the property I'd go there and press the test buttons to see if they trip, this does not guarantee that they will trip in the correct time though.

Seeing that original certificate has made me very suspicious of the new report. I can't say anything for sure but it has set an alarm bell ringing in my head.

 

[MatttB]

The old schedule indicates the consumer unit is dual rcd have they both failed. The two schedules don't tally with each other.

All I know is that it was rated C2 based on the failure to trip... not sure about any further technical details except what is on the report. What would he have to do to correct this fault?

 

[westward10]

All I know is that it was rated C2 based on the failure to trip... not sure about any further technical details except what is on the report. What would he have to do to correct this fault?

The new schedule just doesn't tally with the original something is not correct. The original is almost certainly correct.

 

[MatttB]

That changes things significantly, the original certificate clearly shows that there are two RCDs. The new report suggests that there is only one.
I seriously doubt that both RCDs have failed, one failure is rare but possible.

I would contact the person who did the report and ask them which of the two RCDs failed, or if it was both. I would also ask them if they tripped when the test button was pressed.

If you can access the property I'd go there and press the test buttons to see if they trip, this does not guarantee that they will trip in the correct time though.

Seeing that original certificate has made me very suspicious of the new report. I can't say anything for sure but it has set an alarm bell ringing in my head.

Thanks Dave... I hadn’t spotted this and I am concerned about it. I’ll call the guy tomorrow. Thanks for your advice!

 

[davesparks]

It also appears that the spare ways have vanished, a 32A MCB has been replaced with a 40A and the IR of 2 circuits has improved since the installation certificate was issued.

Has any work been carried out since the installation certificate was issued?

 

[MatttB]

The new schedule just doesn't tally with the original something is not correct. The original is almost certainly correct.

Thanks westward10... I’ll call the guy tomorrow and find out what he says.

 

[davesparks]

And the r1, rN, r2 for the kitchen ring on the report are quite hard to believe.

 

[westward10]

The new fella doesn't know the cpc size for a 10.0 T&E cable.

 

[MatttB]

It also appears that the spare ways have vanished, a 32A MCB has been replaced with a 40A and the IR of 2 circuits has improved since the installation certificate was issued.

Has any work been carried out since the installation certificate was issued?

Not that I can remember, but we did have an issue with the shower, so that might explain that... the rest just doesn’t tally does it?

 

[Julie.]

The two schedules do tally to an extent, it's the same circuits, but he has omitted the spare ways and RCDs and only listed the active ones.

I have seen this before, so not that unusual - however some of the figures look a bit odd, and the rating of one MCB has changed.

Could you take a photo of the CU and post that - we will see straight away what's right.

 

[MatttB]

The two schedules do tally to an extent, it's the same circuits, but he has omitted the spare ways and RCDs and only listed the active ones.

I have seen this before, so not that unusual - however some of the figures look a bit odd, and the rating of one MCB has changed.

Could you take a photo of the CU and post that - we will see straight away what's right.

Thanks Julie... I’m not at the property so I can’t get a photo Im afraid.
Assuming the latest report is correct, what work would be needed to put it right?