Single RCD C/U's

[PIP IOM]

Hi guys

What do you do when asked to do extra work on a system with either integral single RCD (30ma extremely popular over here) or stand alone 30ma RCD covering MCB's or fuses.

Is it a complete no no and upgrade DB only option or can you just comment "Single RCD on main" on cert

 

[Andy™]

wouldnt even make a note - dual split still doesnt fully comply. and split load used in 16th never fully complied either. fault on one circuit not effecting another, but it does with shared RCD. the only thing which would is full RCBO's, but its cost over inconvenience.

 

[Evans Electric]

Do you mean the board is protected by an overall RCD ?

I'd like to see a ruling on this myself, because you cannot insist that every job you go to is upgraded to the 17 th edition .IMO

I,m not sure what Andy means in his post TBH .

Deke

 

[Andy™]

i mean its not worth making a note if there is just one RCD for everything. yes, it doesnt fully comply, but neither do dual split loads, and thats no noted as deviation.

 

[PIP IOM]

yes thats the scenario and I'm not too sure about Andy's post either. Do you mean (Andy) you wouldn't mention it and would just do the work (what comments on existing system?) or would you refuse and demand upgrade.

 

[Andy™]

i would just go ahead with the work if there was only 1 RCD. there are cases where ive added the one RCD on everything to be able to do works

 

[batty]

You are working to 17th edition so you need to note on certificate that consumer unit does not comply to 17th edition. Depending what you are doing is to wether you should connect to consumer unit or not.

 

[Risteard]

The Regulations require you to minimise inconvenience - not prevent it - so it's entirely subjective what that actually means.

 

[batty]

The Regulations require you to minimise inconvenience - not prevent it - so it's entirely subjective what that actually means.

So if you put a cooker circuit in it could trip 30mA Rcd so that would be an inconvenience.

 

[tom1]

[quote name='Andy

 

[Andy™]

yes

 

[Bez]

The Regulations require you to minimise inconvenience - not prevent it - so it's entirely subjective what that actually means.

Agree, it goes back to those immortal words in the EAWR "so far as is reasonably practicable"

 

[spinlondon]

I would make a note in the space for comments on existing installation.

Perhaps mention it to the customer first. You never know, you might get more work out of it.