Two showers off one supply

[Philipn]

Some time ago I built a toilet and shower area at the end of my detached garage for use when doing outside DIY or gardening jobs instead of traipsing through the house with mucky clothes, etc. When I built this I ran a 6mm cable into the garage for the 8.5 kW electric shower through a 45 amp mcb.

Since then I have had a garden room built fairly close to the garage which we use occasionally to accommodate relatives and friends when they stay over. I now want to add an en-suite to this, and obviously would want to include a shower in it.

The en-suite shower will only be used very occasionally so I'd prefer to use the existing supply in the garage. The problem here, of course, would be if the two showers were both used at the same time. This would be a very unlikely event but nevertheless I'd like to come up with some way of preventing it from happening - short of standing outside the door!

Can any of you think of a way of achieving this - for example is there some kind of toggle switch available to allow either one to be supplied while switching off the other?

In the small-signal, machine control world that I inhabited before I retired we accomplished such things by the use of relays but I have no idea about such things in domestic electrics.

 

[Intoelectrics]

You can run the supply into a change over switch then feed each shower from there. This would obviously mean that you can switch between each accessory but they cannot be operated simultaneously.
https://www.googleadservices.com/pa...hUKEwjxo5bglc_fAhUBAXIKHdRSBygQ9aACCDc&adurl=

 

[DPG]

What about feeding the 2nd shower from the combi boiler.

 

[Octopus]

What is the planned maximum load for the outbuilding ?

 

[Philipn]

You can run the supply into a change over switch then feed each shower from there. This would obviously mean that you can switch between each accessory but they cannot be operated simultaneously.
https://www.googleadservices.com/pa...hUKEwjxo5bglc_fAhUBAXIKHdRSBygQ9aACCDc&adurl=

Many thanks. Would this sort of thing do:
63AMP 2 POLE IP65 ENCLOSED CHANGE OVER SWITCH | eBay - https://www.ebay.co.uk/itm/63AMP-2-POLE-IP65-ENCLOSED-CHANGE-OVER-SWITCH/172741581031?hash=item28383358e7:g:m2oAAOSwN2VZSjEm:rk:7f:0

 

[Philipn]

What about feeding the 2nd shower from the combi boiler.

We don't have a combi boiler, just an immersion heater and woodburners - no gas either.

 

[Midwest]

Been mentioned before here; isn’t there a specific device that will only allow one shower to automatically operate at once?

Edit; something like this,
Priority & Non-Priority Shower Units | Electrical News | Meteor Electrical Ltd. - http://www.meteorelectrical.com/news/consumer-units/priority--nonpriority-shower-units/801526994

 

[johnduffell]

See below

 

[Philipn]

What is the planned maximum load for the outbuilding ?

Not really relevant, because the rest of the outbuilding is fed from a separate 4mm swa. The existing shower is a single dedicated supply.

 

[johnduffell]

You can get a priority switch that only lets one work at a time

http://www.meteorelectrical.com/dis.../garo-priority-shower-board-non-priority.html

 

[Octopus]

Are you aware that this work is likely to fall under Part P?

 

[Philipn]

Are you aware that this work is likely to fall under Part P?

Yes, I am aware of that.

 

[Philipn]

You can run the supply into a change over switch then feed each shower from there. This would obviously mean that you can switch between each accessory but they cannot be operated simultaneously.
https://www.googleadservices.com/pa...hUKEwjxo5bglc_fAhUBAXIKHdRSBygQ9aACCDc&adurl=

That looks like a good, simple solution. Some of the other things mentioned would be near perfect, but would also be quite expensive for the occasional use required.

 

[westward10]

We have no idea whether the OP is notifying this job or not he has just asked for advice regarding the install. It is fair enough to ask the question but sharp unhelpful responses are non productive and not necessary, such posts have now been deleted.

 

[westward10]

OP my comment was not aimed at you.