connection between programmer and wiring centre

[slippyr4]

the connection between programmer and wiring centre needs 5 conductors - live, neutral, ch on, hw on, hw off.

What cable do people use for this typically? is 5+E available? I've never come across it! or would you you single cores in trunking?

 

[breezer]

would not hw off be the opposite of hw on?

use two cables, problem solved

the connection between programmer and wiring centre needs 5 conductors - live, neutral, ch on, hw on, hw off.

What cable do people use for this typically? is 5+E available? I've never come across it! or would you you single cores in trunking?

 

[slippyr4]

would not hw off be the opposite of hw on?

indeed it would, but programmers have separate signal lines for off, and on, one of the offs is used in Y plan. the other isn't. so HW off, is not the same as the HW on signal being tied low.

 

[MANDATE]

I'm not sure if I would describe them as opposites.
The heating side basically has a one way switch which is either off or on (one switched live) supplies feed to room stat.
The hot water side has a two way switch. 'on' supplies feed to 'cylinder stat' and 'off' supplies feed to motorised valve. So it might off the HW but it aint off altogether.

 

[ChrisR]

As Breeezer reminded us earlier, you're only allowed to use flex (6 core is available) if the programmer instructions say you can. It would need a cable clamp they don't usually have. So, eg, use 1 x 2 core + earth and 1 x 3 core + earth 1sq mm cable.

 

[slippyr4]

I'm not sure if I would describe them as opposites.

I would. The programmer has 2 SPDT relays in. The common is tied to Live. So, electrically it's as I said.

However, the standard wiring for Y plan only needs a signal for heating on; so it's only used as a single pole, and the ch off line is NC