3 63 amp RCDs on same circiut

[Edd]

thought I had the install setup in my head,, but im missing things?? 100amp 3 phase main swith with no RCD that sound normal? to a 63amp with 30ma rcd? which is where? off to a duel board... sorry im not getting it now.. dont get frustrated kay, but a few pics may really help here as your termnoligy seems a lil off m8,, in the politest manour..

ps my spelling seems to suck

 

[king_11]

thought I had the install setup in my head,, b ut im missing things?? 100amp 3 phase main swith with no RCD that sound normal? to a 63amp with 30ma rcd? which is where? off to a duel board... sorry im not getting it now.. dont get frustrated kay, but a few pics may really help here as your termnoligy seems a lil off m8,, in the politest manour..

ps my spelling seems to suck

can't seem to upload pics.

100 amp is Rcd mate. To a 63 Rcd below board and then off to a dual Rcd.

 

[Octopus]

I think the only way forward would be a couple of pictures ... and what test equipment do you have at your disposal?

 

[king_11]

I think the only way forward would be a couple of pictures ... and what test equipment do you have at your disposal?

Fluke multimeter

 

[Des 56]

2 pages of compressed descriptions of the install and questions on that set up in each post,my eyes ache

 

[Edd]

so we got a 100amp 30ma rcd at the front end (3 phase)( thats a pain in the butt too start with),, if this is so then get rid of the others, their not needed.....wonders why they were fitted.. if its not tt then get rid of the front end rcd and use rcbos for the circuits that req rcd.... sorry if im not more helpfull...

 

[alarm man]

Fluke multimeter

decent meter fluke,you may need more than that tho

 

[king_11]

so we got a 100amp 30ma rcd at the f ront end (3 phase)( thats a pain in the butt too start with),, if this is so then get rid of the others, their not needed.....wonders why they were fitted.. if its not tt then get rid of the front end rcd and use rcbos for the circuits that req rcd.... sorry if im not more helpfull...

ok that's what I was thinking . I can take the rcds out and just use the main switch as isolation in dual board

 

[king_11]

Yes it is tt.

 

[Edd]

sorry went to bed!,, If its TT then the RCDs are required, but not all of them I would be looking at trying to remove the 3 phase RCD and fit a main switch then fit rcbo's to final circuits that are fed from the 3 phase board, and an MCB to feed the other RCD protected board..hopefully there aint many ways on the 3 phase board. at least this spreads the loads and any faults will trip the approprate RCD.

 

[king_11]

sorry went to bed!,, If its TT then the RCDs ar e required, but not all of them I would be looking at trying to remove the 3 phase RCD and fit a main switch then fit rcbo's to final circuits that are fed from the 3 phase board, and an MCB to feed the other RCD protected board..hopefully there aint many ways on the 3 phase board. at least this spreads the loads and any faults will trip the approprate RCD.

okay I've changed a few things around today ... I've taken out the Rcd below board . I've notices as well it seems to trip when it gets a surge of current ie printer or hand dryer. The 3phase braker is an old mem one so could be a problem changing that

 

[Octopus]

I've notices as well it seems to trip when it gets a surge of current ie printer

Cripe, where are you? Wapping?

 

[Edd]

Do you have an IR tester? as what you are discribing could well be an underlying low resistance that on its own is not enougth to cause a tripping situation, but when a suden increase in load is seen it unbalences the RCD. (this is very common)

 

[king_11]

Do you have an IR tester? as what you are discribing could well be an underlying low resistance that on its own is not enougth to cause a tripping situation, but when a suden increase in load is seen it unbalences the RCD. (this is very common)

I have s fluke multimeter yeah . What's the best way of sorting it ? Remove Rcd?

 

[Octopus]

I have s fluke multimeter yeah . What's the best way of sorting it ? Remove Rcd?

Removing the RCD may cure the "pain" for the client but is not the way to find andfix the fault. Have you IR'ed anything?

 

[king_11]

Removing the RCD may cure the "pain" for the client but is not the way to fin d andfix the fault. Have you IR'ed anything?

I know your right but the customer has also ask me to do this . I have not no

 

[gottahugenoggin]

I know your right but the customer has also ask me to do this . I have not no

If faced with a fault on a circuit where the CU has rewireable fuses and the the customer asks you to replace the fuse wire with a nail would you do it?
If the fault is on the circuit then the RCD's only doing its job.You'd be removing the protection not the problem
Is it a multimeter or a multifunction tester you have?
The best way for these guys to help you out would be to post some pictures and give as much info as possible,what tests you've carried out and the results

 

[Edd]

sry King11 but without an IR (insulation resistance) tester finding the underlying fault is gona be almost imposible, and time consuming, at best your gona be guessing.. And as the others have said dont remove the RCD just because the cliant has asked, it WILL be your arse on the line.

 

[Octopus]

sry King11 but without an IR (insulation resistance) tester finding the underlying fault is gona be almost imposible, and time consuming, at best your gona be guessing.. And as the others have said dont remove the RCD just because the cliant has asked, it WILL be your arse on the line.

I noted my comment about IR tested went unanswered.... may be it will now.

 

[tony mc]

What you don't want is the next call being to the fire service once the RCD is removed!

I wonder who the client would blame when they insist they know nothing about electrics and RCD's stating that why they contacted a electrician!

A RCD trips for a reason and that need to be established or walk away from the job IMO!