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 Post subject: Underfloor heating
PostPosted: Fri Nov 25, 2016 10:38 am 
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I'm wiring in the underfloor heating and the power cable to the heating is a 2 core but with a metal braid around the neutral and live (underneath the outer plastic sheath). What is this metal braid for? Is it effectively the earth (and so I connect it to the earth from the supply) or do I just cut it back out of the way?


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 Post subject: Re: Underfloor heating
PostPosted: Fri Nov 25, 2016 4:59 pm 
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Sounds like a SWA used in buried supplies, in which case it should be earthed.


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 Post subject: Re: Underfloor heating
PostPosted: Fri Nov 25, 2016 5:04 pm 
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Thanks. It's just like a mesh net. I can't see how you'd be able to connect it to earth though.


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 Post subject: Re: Underfloor heating
PostPosted: Fri Nov 25, 2016 5:19 pm 
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Usual to use a gland and clamp in a purpose built terminal box; many u tube examples, look for SWA termination.


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 Post subject: Re: Underfloor heating
PostPosted: Fri Nov 25, 2016 6:27 pm 
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Its NOT an swa, it does sound like the screen. What does the MI say? it probably should be connected to earth, You should be able to solder to it, OR bring the inner cores out slightly prior to the end then twist the braid and put a connector on it.

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 Post subject: Re: Underfloor heating
PostPosted: Fri Nov 25, 2016 8:28 pm 
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There is nothing in the MI unfortunately. Just a simple wiring diagram which only depicts live and neutral. It seems strange that it would be the earth though as it's the cable which 'is' (ultimately) the underfloor heating. It's coming out the back of the timer and then runs through the wall and under the floor to become the heating cable so surely it would just be a flow and return? What would it be earthing?


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 Post subject: Re: Underfloor heating
PostPosted: Sun Nov 27, 2016 6:23 am 
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The proper braid glands Image are a pain to use, and the Hawk type with reversible ring very expensive. So I tend to tease open the braid, hook the inner cables through the hole then stroke the braid to make it thinner and put earth sleeve on it and used a stuffing gland.


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