UK I replaced the light and now my heater switch won't switch on.

[Fishing heads]

Hi I replaced few of the lights 4 to be precise 2 downstairs and 2 upstairs and now my heater won't turn on.
Is it just the coincidence? Did I make a mistake? All the other socket is working but the switch next to the heater won't turn on. I replaced the fuse.. also, if I am correct, light and sockets won't be connected because of different amps . Just need a confirmation or possible solutions.

Thanks
Fish head.

 

[fairlight]

Yes but there is a separate MCB marked water heater/immersion heater
Try that one

 

[DPG]

Let us know how you get on.

 

[davesparks]

It's a potterton powermax, don't expect too much from it, like heat or hot water.

 

[Zerax]

It's a potterton powermax, don't expect too much from it, like heat or hot water.

Are they the ones with "turbulators" ?

 

[PEG]

Just had a Kingfisher Mf.....another Potterton puzzle?

 

[Kidsolo]

You don't appear to have a heater circuit. This isn't a gas heater and you are talking about an igniter?
[automerge]1571623335[/automerge]

 

[Fishing heads]

Hi guys,thank you for your generous help. So it seems like the actual mcb was faulty. For now, I just took the wire out and connected it to the socket and it's working now.

 

[davesparks]

Hi guys,thank you for your generous help. So it seems like the actual mcb was faulty. For now, I just took the wire out and connected it to the socket and it's working now.

How did you confirm that an MCB was faulty?

You can't just take a cable out of one mcb and put it in another without checking that the new arrangement is safe and that mcb provides the correct protection.

 

[Fishing heads]

How did you confirm that an MCB was faulty?

You can't just take a cable out of one mcb and put it in another without checking that the new arrangement is safe and that mcb provides the correct protection.

I mean I connected it to the socket MCB, it worked, I took it out and put it back to the original MCB (water heater) it was not working again. They should have the same rating. So I figured it would be safe.

 

[Deleted member 105166]

I mean I connected it to the socket MCB, it worked, I took it out and put it back to the original MCB (water heater) it was not working again. They should have the same rating. So I figured it would be safe.

The photo you uploaded shows the socket MCBs to be 32A whereas the water heater MCB is 16A. Whether it was safe to swap, or not, depends on the size of the cable that you removed from the 16A MCB and placed into a 32A protective device.

 

[Fishing heads]

The photo you uploaded shows the socket MCBs to be 32A whereas the water heater MCB is 16A. Whether it was safe to swap, or not, depends on the size of the cable that you removed from the 16A MCB and placed into a 32A protective device.

I checked the MCB and they are the same size. 2.5mm also on the wall it was fused down to 13a. So, it should be fine?

 

[Deleted member 105166]

I checked the MCB and they are the same size. 2.5mm also on the wall it was fused down to 13a. So, it should be fine?

Whilst unlikely to be an issue for a brief period of testing, 2.5mm T/E on a radial circuit should be protected with a 20A device.

 

[Kidsolo]

and people wonder why houses burn down

 

[fairlight]

Whilst unlikely to be an issue for a brief period of testing, 2.5mm T/E on a radial circuit should be protected with a 20A device.

Whilst the OP should not have swapped without proper advise, in practice the requirements for fault protection would have been met by the 32a device unless something was far amiss, and if the circuit is feeding a fixed load through a 13a FCU there is no requirement for overload protection at source.
So no, a 2.5mm radial does not have to be on a 20a device.

 

[Deleted member 105166]

Whilst the OP should not have swapped without proper advise, in practice the requirements for fault protection would have been met by the 32a device unless something was far amiss, and if the circuit is feeding a fixed load through a 13a FCU there is no requirement for overload protection at source.
So no, a 2.5mm radial does not have to be on a 20a device.

2.5mm T/E on a 32A CPD does not satisfy Iz ≥ In