Off peak immersion heating wiring query...

[Quinnysparks]

I've been testing some flats that have immersion heaters, 2 supplies - daytime and off peak. The off peak supply is wired from the meter through a contactor then back into the mcb, with the outgoing supply to the immersion heater coming from the contactor. However, when the mcb is isolated, the outgoing side of the mcb is still live from the contactor feed. I've not seen them wired like this before, just doesn't seem right. Anyone care to shed some light on this, or am I just being dumb :confused5:

 

[oldtimer]

No picture no wiring diagram so no reply

 

[Quinnysparks]

No picture no wiring diagram so no reply

Awesome.

 

[snowhead]

What you describe doesn't make sense.

Meter to contactor
Contactor to MCB
Immersion heater is fed from the contactor.
So the MCB is doing nothing as the Immersion heater is in effect fed direct from the Cut out fuses?

 

[Quinnysparks]

What you describe doesn't make sense.

Meter to contactor
Contactor to MCB
Immersion heater is fed from the contactor.
So the MCB is doing nothing as the Immersion heater is in effect fed direct from the Cut out fuses?

Yep that's pretty much it. Didn't make sense to me either!

 

[oldtimer]

Awesome.

Listen electricians are not mind reader so cut the sarrcy and start being professional about it instead of being cryptic or keep blundering through jobs as you switch more guys off