Borrowing a live

[theflyingpig]

I've messed up and only pulled a 3 core & earth to location of wired programmable room thermostats. This means the there is only power to these when the main programmer is calling for heat in that zone... Annoying when you want to make a change at the thermostat when programmer is off.....

My question..... If labelled clearly as to what it is, can I borrow a perm live from a lighting circuit?

Thanks

 

[Stuckinarut]

Not something I’d recommend, as it should all be fed from the same source. Which thermostats?

 

[flameport]

. This means the there is only power to these when the main programmer is calling for heat in that zone

With programmable thermostats they do both time and temperature.
There is no need for a 'main programmer' - that's the whole point of a programmable thermostat.

 

[ericmark]

Borrowing a line is actually called a borrowed neutral, and that is not permitted.

 

[JohnW2]

Borrowing a line is actually called a borrowed neutral,

I'm not sure how that works in the OP's context?

 

[Murdochcat]

What make and model ?

 

[flameport]

, can I borrow a perm live from a lighting circuit?

Certainly not.

If you really must have a programmer and a programmable thermostat, they can be made to work with a relay.
Permanent power to the thermostat, switched output from the thermostat powers a relay coil, the relay contact switches the output from the programmer.

The real solution is to sling the programmer away and just use the thermostats.