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Discuss Cable size for spur socket in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Beeg

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DIY
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Hi all,

I have a spur socket on the upstairs landing from a ring socket in an adjacent bedroom.

It is connected in 2.5mm T&E ; is this okay or should it be 4mm due to it being a double outlet hence it could supply 26A?
It currently has only a decorative LED tree thing plugged in.

The cable length is less than a metre if that makes any difference.

Cheers
Beeg
 
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Taylortwocities

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If the ring is in 2.5mm, then the spur should also be in 2.5mm.
In practise you'll never have 2 x 13A loads on a double socket. Even the BS1363 spec puts the test current for double 13A sockets at maximum 20amp.

Also, put your mind at rest and have a look at the current-carrying spec for 2.5mm T&E!
 

Beeg

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DIY
  • Thread Starter Thread Starter
  • #3
If the ring is in 2.5mm, then the spur should also be in 2.5mm.
In practise you'll never have 2 x 13A loads on a double socket. Even the BS1363 spec puts the test current for double 13A sockets at maximum 20amp.

Also, put your mind at rest and have a look at the current-carrying spec for 2.5mm T&E!
Minimum rating is 24amp... fair enough. Would you mind explaining why there would never be 2 x 13A loads on a double socket?
A 3kw heater at 230V would be 13.04 amps so surely having two plugged in would be 2 x 13A loads?

Please forgive my ignorance.
 

Wilko

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Hi - hope you’re not planning to use this for your cooker :) .
As above the outlet is not designed to support two 13A loads simultaneously. Nor are the circuit conductors dimensioned for that load, as there may be 10 (or more) double outlets on that circuit. The outlets are positioned for convenient use, but not dimensioned for continuous use at maximum load. If it’s known that specific heavy loads will be used (like cookers) then it’s common to put in a circuit for them.
 

littlespark

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It’s known as diversity in the trade.

You could argue that a 3kW heater could be plugged into every socket outlet on the ring, but in reality we don’t do it.

Also the reason we aren’t allowed a spur from a spur... where we could have more than one double socket being supplied by that 2.5 cable.
Unless it’s fused down to 13A to protect the cable
 

Beeg

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DIY
  • Thread Starter Thread Starter
  • #6
Thanks for the replies everyone :)
 
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