4mm cable into the bottom of main switch.

[stevels4]

I've Harmonised that for you.

My pet hate.....Colour Harmonisation!
3 phase meter change...all grey apart from L3 load which was brown....it was grey when it was finished!
Strange thing is on CT metering all the CT wires and the sense voltage wires are red!

 

[Deleted member 9648]

My pet hate.....Colour Harmonisation!
3 phase meter change...all grey apart from L3 load which was brown....it was grey when it was finished!
Strange thing is on CT metering all the CT wires and the sense voltage wires are red!

Couldn't agree more. Done a TPN board change a couple of weeks ago, half the blacks neutral, half phase......same with the blues. Despite the passage of time I still struggle to see how a panel of (allegedly) intelligent techies spent weeks debating it and came to the conclusion that was a good idea.

 

[gazdkw82]

The circuit originates from the OCPD (main switch), not the 20a rcbo.

It's a little frustrating because it's one of those grey areas like multiple spurs from 1 single point and not confirming r1+r2 on minor works etc. There is no real documentation clearly outlining it's not right but we all know it's a Badgers arse

 

[Wilko]

We could come up with a few of our own classifications, like they’ve got for films - RABA in this case .

 

[Marcus Vaughan]

The circuit originates from the OCPD (main switch), not the 20a rcbo,

Sounds like you are inferring that a main switch and OCPD are one and the same?

 

[gazdkw82]

Sounds like you are inferring that a main switch and OCPD are one and the same?

No I'm saying the circuit originates from the main switch which IMO is inadequate protection. When designing circuits you choose a protective device to protect the entire circuit.

 

[Deleted member 9648]

No I'm saying the circuit originates from the main switch which IMO is inadequate protection. When designing circuits you choose a protective device to protect the entire circuit.

Not necessarily. The regulations permit omission of devices for both fault current and overload current under certain conditions, such as short tails to a DB at the intake. An OCPD on the load side of those tails effectively limits the current on the supply side. The same principle allows an unfused spur from a 32a RFC when effectively the CCC of the 2.5mm is around 26a. The fact that only one twin socket is permitted means only 2x13a=26a can be drawn.