Faulty rcd

[joehat]

I have a cu with a main switch/ faulty rcd, eg It doesn't trip under 5x 40ms and 1x 300ms.

As the board is an old one, without finding a replacement if ones possible, is it aloud that I put one in front of this rcd?

I don't see a problem myself, they don't want the whole new cu cost but would be happy with a new rcd before the board, leaving the rcd in the board that's not tripping with in max time.

 

[Leesparkykent]

I have a cu with a main switch/ faulty rcd, eg It doesn't trip under 5x 40ms and 1x 300ms.

As the board is an old one, without finding a replacement if ones possible, is it aloud that I put one in front of this rcd?

I don't see a problem myself, they don't want the whole new cu cost but would be happy with a new rcd before the board, leaving the rcd in the board that's not tripping with in max time.

How did you test the rcd?

 

[telectrix]

echo the above.

 

[Simonslimline]

How can you be sure that the RCD is what is actually at fault.

As above, how did you test the device?

 

[telectrix]

popcorn time?

 

[Pete999]

What the all said ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 

[Octopus]

Is this yours or a customers?

 

[telectrix]

ey up, owd un. ow's it goin?

 

[telectrix]

last post directed @ pete.

 

[Flanders]

If you are putting a new rcd in a seperate enclosure next to the cu i would bypass the old rcd but with all the messing about you might as well change the hole db with a split load plastic one as they are selling them off cheep and are still complaint until january , probley get one cheeper than an rcd in an enclosure

 

[Deleted member 9648]

I have a cu with a main switch/ faulty rcd, eg It doesn't trip under 5x 40ms and 1x 300ms.

As the board is an old one, without finding a replacement if ones possible, is it aloud that I put one in front of this rcd?

I don't see a problem myself, they don't want the whole new cu cost but would be happy with a new rcd before the board, leaving the rcd in the board that's not tripping with in max time.

What the above posts are implying is incorrect test procedure. Have you tested this RCD in isolation with no loads connected?It's rare in my experience for RCD's which do trip to fail to trip in the permitted time,older Bs 4293 RCD's are especially reliable in this respect. It's nearly always the case that an RCD is tested with loads connected which will give a higher trip time,particularly loads with a capacitor such as a fridge or fluorescent light. Test the RCD on its output terminals with all final circuits isolated.

 

[joehat]

Yes tested direct all mcbs off Ect.
Yes I could change fb but that's 3-4 hours compared to 1hour.
I'm
Confident I tested it correct and there could not be any interference with results.
They are selling so as long as this is okay to do this way I will. But not wanted thoughts.

 

[joehat]

Shame newer rcds are not so reliable if you suggest old ones are rare to fail.

Bg are useless I had 3 In a row fail. So I realised the price difference is why. But still it should do what it says whatever the price.

 

[davesparks]

You say you had the MCBs off when you disconnected, but had you isolated the outgoing neutral too?

 

[bigspark17]

Post a pic or part number of the rcd at fault on here guarantee one of our member will be able to source one.!

 

[joehat]

You say you had the MCBs off when you disconnected, but had you isolated the outgoing neutral too?

Don't normally do this as it normally tests fine, I had read in a previous posts but you reminded me and I tested with the neutral disconnected and I tested okay,

So thank you .