Cooker and shower on the same circuit

The trouble with sockets is you can't guarantee what will be plugged into them. Stacked, unfused 2-way cube adaptors for example.

True - but we already deem that risk acceptable by permitting unfused spurs from rings (including feeding a double socket) - it would be inconsistent to a condemn the arrangement on a shower circuit while permitting effectively the same from a ring (or a 32A radial).

   - Andy.

1/ in Uk it`s usually full power (rarely cold water only for swilling) , almost never the low heater setting.

2/ Initially, depending upon ambient, quite a few mins initially for washing cycle then multiplied by shower usage probability which in itself varies lots and lots.

3/ very likely but usually not for long.

4/ and 5/ horses for courses

Well there's a thing. I come across many 9.5kW (approx.) electric showers where at full heat setting they are just too hot and the half heat setting is selected. My hot water comes from a copper cylinder. The frinkin safety cut out keeps tripping out. At present there is so much junk in the way I can't be bothered to reset it as its inaccessible. So I have warm showers with unheated water. The loft feeder tank gets warm during this  hot weather so I am not frozen. Also it saves the cost of water heating. I might continue with unheated water showers right through winter and become a Spartan.

Z.

Mira state in their shower installation manuals that you cannot supply another product such as a fan or pump via the shower.

Over the years I have seen lights, pumps and fans connected to the terminals inside a shower, which Mira say is not acceptable.

That doesn’t mean that an appropriately installed fused supply to a light, pump or fan cannot be taken from an external switch.

Connecting a socket for a washing into a shower circuit probably isn’t ideal, but based on previous discussion it seems it doesn’t contravene any Wiring Regulations.

Hm, more manufacturers instructions without reason. You imply that they mean the circuit and not the shower terminals, which might be reasonable. However I see no reason at all why the circuit should not power what you like, but of course if you add a fuse to do so that then becomes another circuit! A 13A socket or two or six might be fed from this circuit given suitable sized cables, and a 63A fuse might protect the lot. Do Mira know something which we do not? I expect they do give a circuit CPD rating for the shower, what is it?

Mira probably doesn't want unauthorised meddlers tampering with the internals of its showers. And quite right too.

Z.

There are dedicated connections for specific shower waste pumps in some Mira electric showers, they just don't want electricians or DIYers dogging random cables into the shower input terminals, as some do.

Sparkingchip said:

they just don't want electricians or DIYers dogging random cables into the shower input terminals, as some do

Could be something to do with the capacity of the terminals.

5. The brown one.

And some dodgy D.I.Yers adding bell wire to supply an  extractor fan.

Z.

yeah, but that's when we have a 27A-rated cable protected by a 32A breaker, which is a bit over. Here we're talking about a B40, which is quite a bit more over.