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Ask The Trades › DIY Forum › Electrical Questions › Electrical Thermostat wiring

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Electrical Thermostat wiring (Read 4553 times)

Ewan

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Electrical Thermostat wiring
Sep 7^th, 2011, 10:56am

A mains operated thermostat has three conductors to enable it operate correctly. Is it possible to connect to an existing 2 core plus cpc cable, and if so, why :-??

For info, I'm reading theory on basics with an intention of qualifying eventually as a domestic electrical installer, but books are books and I've hit a wall; any help would be very much a bonus.

Sincerely, John

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thescruff

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Re: Electrical Thermostat wiring
Reply #1 - Sep 7^th, 2011, 4:12pm

Assuming you're thinking boilers electrics, the first lesson is to find out how the controls work and how the system are designed to work.

There's a hundred and one stats, some require a neutral for the anticipator, while others may be 240v 24v or volts free.

Can you run a single cable, yes if it's the right cable, I would use it as the switched live keeping the pair as L&N.

« Last Edit: Sep 7^th, 2011, 4:13pm by thescruff »

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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Electrical Thermostat wiring Reply #2 - Sep 7^th, 2011, 8:49pm Are you really asking if the earth wire in a T&E cable can be used to run neutral if the stat doesn't need an earth?
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Electrical Thermostat wiring Reply #3 - Sep 7^th, 2011, 9:01pm If you are asking if you can use a twin and earth cable, using the earth as the third core, then NO! You must not do this. Yep, it may well work but would be hugely non-compliant. No inner insulation on the earth, no way of safely terminating it, no earth provision at accessory (required even if not used).
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Ewan GDPR opt-out Total Thanks: 109 For This Post: 0	Re: Electrical Thermostat wiring Reply #4 - Sep 8^th, 2011, 3:48pm Thanks eveyone; The question I've been asked is as I thought a tad ambiguous, when I can get hold of a tutor to speak to I will get him to clarify...thanks again.
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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Electrical Thermostat wiring Reply #5 - Sep 8^th, 2011, 4:27pm Some stats like this one can be used with three+earth or twin+earth (the latter needs a battery to power the stat). http://www.screwfix.com/p/danfoss-tp4000-24hr-programmable-room-thermostat/90659...
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