tt system board change

[sparkyphil1]

hi am i right in thinking on a board change for a tt system that the main 60a rccb can be done away with if installing a new plastic ccu with rcbos on all circuits?
existing board is old brown wylex rewireable , no more room on board to facilitate new 10 kw shower circuit.thus board change req

thanks for your replys

 

[KFH]

I would say yes if the tails are short and as you say plastic CU. But with the state of my memory I would get a third opinion.

 

[Buckfast]

As KFH says, all acceptable, Good Dbl insulated tails, insulated consumer unit, and rcbo's on all circuits, earth loop impedance satisfactory etc.

 

[Engineer54]

Always prudent to install an up front 100mA S type RCD (or even to replace main isolation switch in CU), on TT installations, as a means of back-up to any downstream 30mA RCD/RCBO's failing...

 

[telectrix]

what he said ^^^^^^. that with RCBOs makes the job as good as it can be.

 

[Engineer54]

As KFH says, all acceptable, Good Dbl insulated tails, insulated consumer unit, and rcbo's on all circuits, earth loop impedance satisfactory etc.

Think you mean, ..''Insulated and sheathed'' tails. Preferably DP RCBO's!!

 

[Knobhead]

Phil, if you have to ask, should you be doing the job?

 

[sparkyphil1]

had to be one funny comment ! lol i took it like a man ooh er missus