TT systems and main rcd.

[coxy84]

went to house today to add a new shower circuit and as i looked at the board which was updated a year ago, i found that it is a normal spilt load board. with no 100mA rcd main switch just a normal 100A main switch with 2x 30mA rcds covering the circuit.

Now me being under impression that a tt system should have a 100mA RCD, I rang the electrician who did the work to ask why he had not installed one and he said that because all circuits in the installation are covered by the 2x 30mA rcds that a main rcd incomer was not needed.

opinions please!

 

[telectrix]

he's correct. the 100mA RCD on TT went out with dual RCD boards. that's not to say you can have one fitted, bu it is now redundant.

 

[coxy84]

thanks
i am just a little concerned about the 2 spare ways that are on the main switch side.
i think this time i will add a 100mA, it doesnt take much for some one to put a mcb in there thinking it'll do.

good to know for future referance though

 

[Des 56]

Would be a cheaper option for future proofing to just lob the excess bus bar off
There are still uses for 100m/amp s types on a domestic TT where there is a metal clad consumer unit, if only for protection of the tails

 

[IQ Electrical]

thanks
i am just a little concerned about the 2 spare ways that are on the main switch side.
i think this time i will add a 100mA, it doesnt take much for some one to put a mcb in there thinking it'll do.

good to know for future referance though

I hear what you're saying but you can't legislate for some idiot turning up in the future and carrying out unsafe alterations/additions, where do you stop?

 

[coxy84]

Would be a cheaper option for future proofing to just lob the excess bus bar off
There are still uses for 100m/amp s types on a domestic TT where there is a metal clad consumer unit, if only for protection of the tails

sounds like a better idea!