Hi help on a tt system with the board

[Lovell1991]

I'm an electrician but never work on tt systems , my girlfriends parents need some work doing and asked me to help . They currently have a board In switch a 100 am rcd but no main switch to isolate the board . Does the main switch have to be enclosed in the board or can it be in its own enclosure next to the board as there is no spare ways and save them money on a new board ?Thank you

 

[i=p/u]

Put a switch fuse on the tails or change to dual switch in cu. or an isolator.

 

[JD6400]

Hi Lovell1991 and welcome to the forum !
Do you mean that you have a 100ma 100amp rcd as the main switch in the board at the moment ?

 

[telectrix]

a bit more detail with a photo would help.

 

[not clever]

As clear as mud

 

[Engineer54]

No problem having an up front RCD also acting as the means of mains isolation to the CU so long as it's current rating is suitable!! The DP switch section of the RCD will have the same characteristics as a typical main switch isolator

You really need to change the existing CU to a 17th ed configuration board which at the very least gives you two sections of the CU protected by 2 X 30Ma RCD devices, and it will also be prudent to install a 100mA S type RCD up front, as an added safety measure to any UK TT system!!


Better still, get your girlfriends parents to check if a PME connection is available from the local DNO!!