Will this RCD fit into this board?

[HappyHippyDad]

Morning....

I have a chap who wants 30mA protection on all his circuits.

He currently has the main switch as seen in the picture below showing the whole CU


Will the RCD below fit into this board in the same place?

The one he has is marked WSEM, the one I can buy is WSES. Are these interchangeable?

If they are not then I may try and convince him just to have 30mA protection on the circuit I will be working on. So my next question is, is there an RCBO which will fit this board?

Cheers.

 

[SparkyChick]

If it was an isolator and not an RCD, I would probably agree that it wouldn't comply. But since it's already an RCD and in the event of a fault it will trip and take out everything, I think there is some argument to say it's not making things worse in fact you could argue it's a safety improvement since the whole installation would have additional protection.

 

[Midwest]

If it was an isolator and not an RCD, I would probably agree that it wouldn't comply. But since it's already an RCD and in the event of a fault it will trip and take out everything, I think there is some argument to say it's not making things worse in fact you could argue it's a safety improvement since the whole installation would have additional protection.

Think thats stretching the spirit of things a bit. That 100mA might sit there all day, not noticing diddley, whereas the 30mA will trip if there's a Y in the day.

 

[SparkyChick]

Think thats stretching the spirit of things a bit. That 100mA might sit there all day, not noticing diddley, whereas the 30mA will trip if there's a Y in the day.

I did say you could argue it's an improvement... not sure I would

I've got a client with one of those boards and when it came to testing some changes, I couldn't even get 1/2x test to complete. Ramp tested the RCD with nothing on it and it was tripping at around 12mA.

Only tripped when I tested it, despite the installation being somewhat old.

The risks could perhaps be mitigated somewhat with a couple of well placed emergency lights.

 

[Toneyz]

Is this a TT supply this I don't think has been answered which maybe why a 100mA rcd main switch.
What is wrong with it anyway Do you want to change to 30mA for compliance for the works you are carrying out?

 

[HappyHippyDad]

you literally can't just swap it out though, even if it fits it doesn't comply

I can

 

[HappyHippyDad]

Is this a TT supply this I don't think has been answered which maybe why a 100mA rcd main switch.
What is wrong with it anyway Do you want to change to 30mA for compliance for the works you are carrying out?

I'm not sure if its a TT or not. Could you tell me why that makes a difference?
I dont want to change it but that is what the customer is asking for. Ive given him the alternatives but he is adamant thats what he wants.

 

[suffolkspark]

I can

well you can do what you like, but it doesn't comply, by all means bosh a second hand ebay one in there and deny you ever did it if that's the route you want, but you cant cert that you did it

I'm not sure if its a TT or not. Could you tell me why that makes a difference?
I dont want to change it but that is what the customer is asking for. Ive given him the alternatives but he is adamant thats what he wants.

your the electrician... you tell him what he can have? what he "wants" is irrelevent

 

[123]

I'm not sure if its a TT or not. Could you tell me why that makes a difference?
I dont want to change it but that is what the customer is asking for. Ive given him the alternatives but he is adamant thats what he wants.

Surely if you are going to be carrying out some works you would know what the earthing arrangement is and if the bonding etc is up to scratch?

Also if it is TT and you are adamant your going to do these works, it would be better to do it by adding the 30mA RCD in a separate enclosure beside the consumer unit, and have the 2 RCD's in series so at least if the 30mA RCD goes faulty there is a chance of some fault protection.

 

[HappyHippyDad]

well you can do what you like, but it doesn't comply, by all means bosh a second hand ebay one in there and deny you ever did it if that's the route you want, but you cant cert that you did it



your the electrician... you tell him what he can have? what he "wants" is irrelevent

Thankyou, I will

 

[HappyHippyDad]

I did say you could argue it's an improvement... not sure I would

I've got a client with one of those boards and when it came to testing some changes, I couldn't even get 1/2x test to complete. Ramp tested the RCD with nothing on it and it was tripping at around 12mA.

Only tripped when I tested it, despite the installation being somewhat old.

The risks could perhaps be mitigated somewhat with a couple of well placed emergency lights.

Did you delete my post SC? I was deliberately dangling a carrot though, sorry. I've had a glass of ale and instead of ignoring the silly people on here I tend to push them a little (albeit politely), which is just silly of me (but a bit of fun). My apologies Miss SC

 

[SparkyChick]

Did you delete my post SC? I was deliberately dangling a carrot though, sorry. I've had a glass of ale and instead of ignoring the silly people on here I tend to push them a little (albeit politely), which is just silly of me (but a bit of fun). My apologies Miss SC

It wasn't me, I had a short sharp reply typed up in response to the snide comment, was mulling over whether to post it or not or delete the offenders comment but @Sintra beat me to it

 

[GMES]

HHd I presume it was deleted because you had quoted the offending post in your reply, yours was probably a casualty of war.
Depending what you said could have also been deemed not suitable.
Edit.
Can you not see where it says deleted, it gives you the reason which was you'd quoted the offending post.

 

[Deleted member 9648]

I have a number of clients with the same board with 30ma RCD main switches which rarely trip, there is an estate near me where all the houses had this arrangement. 4293 RCD's tend to be more stable than 61008's in my experience. If the 100ma unit failed and the client did not want to pay for a CU change I would have no problems with changing the failed RCD for a replacement 30ma unit, neither would I have any problem with happyhippydads reason for replacing it as long as the client was made fully aware of the possible issues, which would be stated on the cert issued to the client.

 

[Deleted member 9648]

well you can do what you like, but it doesn't comply, by all means bosh a second hand ebay one in there and deny you ever did it if that's the route you want, but you cant cert that you did it



your the electrician... you tell him what he can have? what he "wants" is irrelevent

Yes you can, you just state on the cert that the existing unit had failed and was replaced with a 30ma unit because the client refused a CU change and the installation had no earth fault protection without a replacement. There's more than one way to skin a cat.

 

[123]

HHd I presume it was deleted because you had quoted the offending post in your reply, yours was probably a casualty of war.
Depending what you said could have also been deemed not suitable.
Edit.
Can you not see where it says deleted, it gives you the reason which was you'd quoted the offending post.

My post says deleted, but that was edited by me, cause I was far too late to the party to ask if it was a TT system.