please help with this shower conundrum

melb

hi there plumber is here to fix our Mira shower. he has switched off the isolator switch outside bathroom but there is still 240 volts coming through the wiring. it is also tripping a switch on the consumer unit (electrical board) to which it is not connected. does this make any sense?

markdavey

If the plumber is out of his depth (so to speak) get a sparky in.

melb

yes he's done that and left. OH spoke to the electrician who did electrics for original shower installation and he is baffled and will come have a look. Sounds like it might be the isolator switch outside the shower that has failed?

DVardysShadow

What is tripping? An RCD or an MCB? Makes a big difference.

Has the plumber touched the isolator switch?

Avoriaz

Maybe the isolator switch was for something else?

An immersion heater, fan etc.

melb

when i say isolator switch I mean it's the switch that looks like a big lightswitch and when you turn it on an orange light comes on. If you tried to switch the shower on without first doing this it would not work. the switch that tripped is the one on the consumer unit which is supposedly for the downstairs shower and sockets in the utility area outside. the upstairs had a new RCD put in I think because we were adding underfloor heating and a towel rail which could also be used as an electric one as well as a new shower although we did have one before the refit. Plumber is waiting until we get the original electrician back - don't want him (or us) to get electrocuted.

DVardysShadow

melb wrote: »

.... the switch that tripped is the one on the consumer unit which is supposedly for the downstairs shower and sockets in the utility area outside.

If this is an MCB, there is something untoward about the circuit. You do not put a shower and sockets on the same final subcircuit.

Fingermarks of a bodger here.