Aico Carbon Monoxide Detectors
This official sponsor may provide discounts for members
Advertisement - Content continues below
Advertisement - Content continues below

Discuss Rcd protection for domestic inatalls. in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Hi guys. Am I right in interpreting the regs with regards to rcds that they need to be rated equal to or higher than the main supply fuse? So not to overload them? Or am I reading it wrong?
Thanks on advance.
 
Advertisement - Content continues below
N

Nigel

The main switch needs to me equal to or higher than the upstream OCPD or equal to or higher than the combined ratings of the downstream OCPD.
 
T

Toneyz

Hi guys. Am I right in interpreting the regs with regards to rcds that they need to be rated equal to or higher than the main supply fuse? So not to overload them? Or am I reading it wrong?
Thanks on advance.
That's my understanding of the regs now that's why in a split RCD consumer unit Hager are fitting 100A RCD's by default.
 
  • Thread Starter Thread Starter
  • #4
So for reference,
If you have a 100a main tncs supply and a 100a main switch and 2 rcds of 63 amps then this complies? I thought that the rcds would need to be 100a so to not overload them? Just looking at boards in catalogues and noticed that the boards come with 2 63a rcds or 80a rcds and couldn't see how these still comply the only board I can see comply is hager.
 
  • Thread Starter Thread Starter
  • #5
The trouble is only hager have done this and none of the other manufacturers seem to have followed suit. So cant see how they comply?
 

Charlie_

-
Arms
The total load must not exceed the rating of the incoming device or the assigned assembly rating (InA) whichever is the lower
 
  • Thread Starter Thread Starter
  • #9
Charlie, when you say the incoming device, do you mean the main switch?
 

Andy78

-
Mentor
Arms
Esteemed
The trouble is only hager have done this and none of the other manufacturers seem to have followed suit. So cant see how they comply?
It's up to the installer how the install complies. A total potential load after the RCD less than the rating of the RCD will comply. If the potential load exceeds the rating of the RCD, an OCPD before the CU less than the rating of the RCD will comply.
 

Baddegg

-
Arms
Supporter
Esteemed
Advent Win
In a domestic situation the customer rarely will have an opinion and some of the wholesalers own brands don’t cost much more than a split board...
 
But what if customer dont/want the cost of rcbos
Sell the RCBO's... we are electricians and we know what is right. Split load boards belong in the 80's. Things have changed, DC leakage current / electronic equipment. I don't compete with the flooding of the market with £60 complete (split load AC RCD's) boards. Explain the difference - give the option and if they want to fit the cheap board - find someone else to do it.
 
Advertisement - Content continues below

Reply to Rcd protection for domestic inatalls. in the Electrical Forum area at ElectriciansForums.net

Aico 3000 Range
This official sponsor may provide discounts for members
Advertisement - Content continues below
Advertisement - Content continues below

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
Advertisement - Content continues below
Top Bottom