3 63 amp RCDs on same circiut

[king_11]

2 are in the board and the other is feeding that which is also being fed from a 100 amp rcd. cant seem to find any problems with cables and does just nuisance trip.

help plz

 

[nickblake]

will need some more info as its a bit sparse what are the miliamp ratings of the RCD are they time delayed and what installation methods have been used for the cabling that the RCD's are supplying

 

[king_11]

not time delay...all 30 ma ... 10mm swa in whole install

 

[tony mc]

Still need some further info.

Nuisance tripping what is tripping?

Is the 100 mA RCD a S or time delayed as if it is not you will possibly have no discrimanation !

 

[Edd]

yer a lil confused as to what your discribing,, as others say a lil more info is needed. and im sure someone here can help

 

[king_11]

Still need some further info.

Nuisance tripping what is tripping?

Is the 100 mA RCD a S or time delayed as if it is not you will possibly have no discrimanation !

They are all tripping sometimes it's just 63 but other times the 100 will go as well. No it's not time delayed

 

[Edd]

whats the layout of the board and circuits, sounds like a bad setup with disgrimanation between RCDS, can you discribe the layout more or poss pics?

edit,, sounds like you also may have a fault that needs to be found as well

 

[nickblake]

So what you are saying is you have 100 amp RCD feeding 2 63 amp RCD's or you have 100 Amp RCD feeding a dual RCD board ,if this is the case what earthing arrangement do you have , what installation methods is the 100 amp RCD suppling the 63 amp RCD's answers to these questions will help us give you the answer you are looking for sorry to be a pain but the more info you give the better the advice

 

[king_11]

whats the layout of the board and circuits, sounds like a bad setup with disgrimanation between RCDS, can you discribe the layout more or poss pics?

edit,, sounds like you also may have a fault that needs to be found as well

100 amp feeding a 63 amp under board the feeding a dual Rcd board.

 

[tony mc]

Sorry to go on King 11

I cant make sense of this.

Have you a photo as it no looks like 4 RCD 's are connected.

 

[Edd]

100 amp feeding a 63 amp under board the feeding a dual Rcd board.

hmm as others keep saying, im a lil lost as well.. your saying 100 amp feeding 63 amp and then a duel rcd board? are you meaning to say... A 100amp 30ma RCD feeds a 63amp 30ma RCD then goes off to a duel 30ma RCD board? If you are then the whole install is inaproprate and needs looking into, we will then need to know more about the setup to see if any distribution circuits can come off RCDs to stop the problem...
also to dig deaper, is it a TT system?

 

[king_11]

hmm as others keep saying, im a lil lost as well.. your saying 100 amp feeding 63 amp and then a duel rcd board? are you meaning to say... A 100amp 30ma RCD feeds a 63amp 30ma RCD then goes off to a duel 30ma RCD board? If you are then the whole install is inaproprate and needs looking into, we will then need to know more about the setup to see if any distribution can come off RCDs to stop the problem...
also to dig deaper, is it a TT system?

yes that's exactly what I'm saying. I'm not sure if it's tt it's a possibility !

 

[nickblake]

So 100 amp RCD feeding a 63amp RCD feeding a dual RCD board , or is it 100 ma RCD feeding a 63 amp RCD feeding a dual RCD board is the install TNCS , TT ,or TNS

 

[nickblake]

TNCS where the earth is linked to neutral often internally with a block off the side of the cut out , TT uses and earth rod ,TNS where the outer sheath is used as the earth If its a TT supply then you will only need the dual RCD board unless its metal clad where you will need a 100 ma or 30 ma time delayed RCD we could do with a picture so we can offer the correct information

 

[alarm man]

sounds like a tt,100ma as main switch,not sure what the 63/30ma inbetween is doing then to the cu,serious leakage all the same