How many cores for a cylinder stat?

[JohnD]

I am taking up some floor in my mum's house to insulate the primary pipes to the hot cylinder. this is quite a job and i want to run a cable for a future cylinder stat at the same time (it does not currently have one and is gravity circ).

Last time i did one (long ago) I used 1mm T&E with a flex outlet plate in the airing cupboard, but I think I heard that modern cyl stats need 3-core. is that right?> What are they usually cabled in? i won't want to take up the floor again to change it.

 

[namsag]

All depends on make and what other controls , some dont need an earth some do depending on other contols you wil need one live in and either 1/2 lives out

 

[gas_man_gaz]

also depend if ya have a s or a y plan.. better to have a extra wire tho, ya can always chop it off!

 

[JohnD]

I think you are both saying I ought to use 3-core and earth.

Right?

 

[namsag]

Yeah go for that can`t think of any that needed a neutral unless there is some fandangled thing out there for domestic

 

[twgas]

it might be worth putting in cabling for a fully pumped system, just in case!

 

[JohnD]

yes, but the programmer and pump are down by the boiler, so I think as long as I take the cylinder stat cable down there as well, it could be converted down there. The boiler has its own small room (used to be a much bigger boiler but current one is a Profile 100E)

 

[twgas]

then your previous post, 3 core and earth, is the way to go.

 

[Softus]

You only need three cores in total.

You'll probably only connect up two of them, and you're unlikely to use any of them as an earth.

 

[slapper]

You only need three cores in total.

You'll probably only connect up two of them, and you're unlikely to use any of them as an earth.

I thought their were 3 girls and 1 bloke in that there cores group?

 

[twgas]

You only need three cores in total.

You'll probably only connect up two of them, and you're unlikely to use any of them as an earth.

Y-plan
HW on from prog to cyl stat, calling (from cyl stat), satisfied (from cyl stat) possibly earth.

 

[DP]

As already said, three core plus earth will cover all eventualities.

Do not cut spare conductors though.

 

[bengasman]

As already said, three core plus earth will cover all eventualities.

Do not cut spare conductors though.

Good point. Best way is to sleeve a spare core with yellow/green at both ends and stick them with the earth.

 

[namsag]

Ok softas considering most systems being put in are Y plans how will be probable that he will only need 2 wires with no eath..

 

[Softus]

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