Supply to a garage with TT to house

[ban-all-sheds]

I used fibre for gigabit.

But you can run gigabit over copper with no problems...

 

[ricicle]

Wouldn't apply on an all RCBO set-up though would it. (assuming no up-stream TD RCD)

You can't really get away from having an upstream RCD as the feed to the outbuilding will be in SWA or similar.

I was just drifting away from the topic with regard to Rob's general statement about single pole RCBOs being forbidden in TT systems

 

[RF Lighting]

Yeah, I'll look that up, but I seem to remember it being the case, even for an all RCBO setup

 

[ban-all-sheds]

Didn't think they were explicitly forbidden, but they won't clear N/E faults, so 100ms later the incomer will trip, and take out the whole installation, which could be construed as a contravention...

 

[ricicle]

I know the regs say that in a system other than TN that circuits must be disconnected from all live conductors but one switch can fulfil this for a number of circuits ie a main switch.

 

[ricicle]

Didn't think they were explicitly forbidden, but they won't clear N/E faults, so 100ms later the incomer will trip, and take out the whole installation, which could be construed as a contravention...

Only if there's a RCD upstream which needn't be the case in an all RCBO set-up.

 

[ban-all-sheds]

True - I was thinking about the traditional 16th TT CU, but with RCBOs instead of a split with a 30mA RCD....

 

[Spark123]

From a non regs POV if you had a fault causing a N-E short on a single RCD pole protected circuit on a TT system then you'd end up with a pretend TN-CS system which could be dangerous.