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Twin core swa cable

Former Community Member
Former Community Member
I am putting a summerhouse in the garden.  There is an existing cable running from the house to the location of the new summerhouse.

It's not connected yet. 

The cable is twin core 25mm SWA.

Am I OK to use this for connection to the house electrics? 

Is the armour layer used for the earth? 

Thanks for any advice 

Dave

Parents
  • 0
    Hi DaveEyes.

    As that cable is rated at about 100 Amps, and presumably not 1/2 mile long it sounds fine. If the cable is terminated outside you need a type CW gland at the exposed end, which is quite tricky to fit if you have not done it before. If it is not subject to weather a type BW is OK and easier to fit. The gland must be the correct size for a 22mm cable (check when you buy them, it is often on the packet). The Armour acts as the Earth conductor and will be of sufficient size, but I suggest that the supply should be RCD protected at 30 mA. I suspect there is no exposed metalwork entering the summer house, in which case the Earthing system is not a particular concern. It is easiest to fit the gland into a metal box, which will provide good Earth continuity, and then a bolt to connect the Earth wires at both ends.

    I hope that helps


    David
Reply
  • 0
    Hi DaveEyes.

    As that cable is rated at about 100 Amps, and presumably not 1/2 mile long it sounds fine. If the cable is terminated outside you need a type CW gland at the exposed end, which is quite tricky to fit if you have not done it before. If it is not subject to weather a type BW is OK and easier to fit. The gland must be the correct size for a 22mm cable (check when you buy them, it is often on the packet). The Armour acts as the Earth conductor and will be of sufficient size, but I suggest that the supply should be RCD protected at 30 mA. I suspect there is no exposed metalwork entering the summer house, in which case the Earthing system is not a particular concern. It is easiest to fit the gland into a metal box, which will provide good Earth continuity, and then a bolt to connect the Earth wires at both ends.

    I hope that helps


    David
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