Unfused spur.

davezawadi (David Stone):

As the circuit is protected against overload of 13A, is RCD protected, and presumably is at a point where a short circuit disconnection time is less than 400ms, why not Z. The adiabatic for the 1.5 conductors is presumably satisfied (I would be very surprised if not, and the Earth fault is protected by the RCD) then why not. It isn't in the OSG, but no immediate problems seem to be present.


Strange things are happening with my edit! Are you carrying out an EICR Z, or have you run out of 2.5? 

No, I have plenty of 2.5 thanks. I used experience and electrical engineering principles. I knew that the single socket would not normally use more than 13 Amps. The 1.5mm2 supply cable is rated at 20 Amps., probably more as the wall is cool. (North facing by the sea). Also the cable was easy to add to an existing double 13 Amp socket on a ring. Then I discovered the Reg. today that says: "Accessories to B.S. 1363 may be supplied through a final ring with or without unfused spurs...........Such circuits are deemed to meet the requirements of Reg.433.1.1 if the current carrying capacity (Iz) of the cable is not less than 20 A and if under the intended conditions of use, the load current in any part of the circuit is unlikely to exceed for long periods the current-carrying capacity (Iz) of the cable.


Z.

geoffsd:

I would maintain that the requirements of 433.1.204 for ring final circuits do not apply to the spurs but instead that the spurs are subject to the normal regulations - albeit you have not quoted anything which would prohibit what you have done.

Phew! Are you a politician Geoff? Well it was raining during the time of installation.


Z.

If it was a fused spur or indeed  1.5mm2 cable on an 13Aplug for an extension lead I'd have no issue, and unless you think someone will use one of those awful unfused 13A 2 way splits, a single socket is the same really.

 

The single 13 Amp outside socket is going to be used for a car pressure washer I was told. I assumed that any load would be through a fused 13 Amp plug.


Z.

AJJewsbury:

I'd check the 1.0mm² c.p.c. in the 1.5 T&E with the adiabatic carefully - it's probably not by the book on a B32 and the RCD is unlikely to help if the PFC is moderate to high.

   - Andy.

That's a thought. The supply is overheads to a remote bungalow. TT earthing. The C.P.C. is not longer than 300mm from the ring. . Very wet ground just about at sea level. Liable to flooding.


Z.

AJJewsbury:

I'd check the 1.0mm² c.p.c. in the 1.5 T&E with the adiabatic carefully - it's probably not by the book on a B32 and the RCD is unlikely to help if the PFC is moderate to high.

   - Andy.

Hi Andy, what range do you mean by moderate to high, thanks :)