electric shower in outbuilding

J.C.E · Jun 19, 2017

Been asked to make previsions for elec shower in a future outbuild in garden of house I am starting to rewire tomorrow.

The house itself will be heated by central heating- all lights led etc just 1x induction hob then a fan oven +MW. so no excessive load in the house.

Head is 100a SP in external meter box- and c/u in house is >3m so will need to fit a switch fuse isolator switch in the external meter box then 25mm 3c swa from box to c/u.

My question is for the outbuilding supply- theres no space in the meter box for a 2nd switch fuse isolator for the outbuilding so will have to come off of an upfront mcb in the house c/u. But if there wanting like a 9kw shower plus a handful of sockets/lights/heater down there- thats looking at 25/35mm 3core at a 35meter run- which i think is pretty excessive.

1)Has anyone ever fitting a shower at such a distance in for example an outbuilding
2)does the isolator for the house >3m swa tails need to be fused or can it just be a 100a dp main switch? (i think the answer to my question is yes as I can't rely on the dnos mains head fuse- but space looks tight and I know them wylex fused isolators are quite bulky!)

J.C.E · Jun 19, 2017

suppose 16mm swa could work at 35m on a 50amcb

LankyWill · Jun 19, 2017

I'd fit an rcbo off the existing board, less faff and switchgear. Plus one point of isolation, for the cable size you need to design the final demand for the outbuilding and size from there.

Leesparkykent · Jun 19, 2017

How far is the meter to the board position?

7029 dave · Jun 19, 2017

Just a thought, can you not fit another surface meter box adjacent, split tails at origin, conduit between the 2 boxes and fit your switch fuse etc in box 2.?

J.C.E · Jun 19, 2017

LankyWill said:
I'd fit an rcbo off the existing board, less faff and switchgear. Plus one point of isolation, for the cable size you need to design the final demand for the outbuilding and size from there.

would do an upfront mcb (as will be running in swa) then have the rcd protection at the local c/u in the outbuild

J.C.E · Jun 19, 2017

Leesparkykent said:
How far is the meter to the board position?

around 10m- theres a w/c on the other side of the wall to the meter box so have to go around this to have the c/u on the other side of the hall to the w/c

LankyWill · Jun 19, 2017

Could you fit a small cu in the meter box and use BS88 fuse carriers mcb's instead? One to the house cu and one with the armoured glanded off?

Leesparkykent · Jun 19, 2017

J.C.E said:
around 10m- theres a w/c on the other side of the wall to the meter box so have to go around this to have the c/u on the other side of the hall to the w/c

can you install another meter box next to the existing?

J.C.E · Jun 19, 2017

LankyWill said:
Could you fit a small cu in the meter box and use BS88 fuse carriers mcb's instead? One to the house cu and one with the armoured glanded off?

will not get a 25mm into a mcb

J.C.E · Jun 19, 2017

Leesparkykent said:
can you install another meter box next to the existing?

for?

the meter box is recessed- so would now probaly struggle to wire between a reccessed and an additional surface one

Leesparkykent · Jun 19, 2017

J.C.E said:
for?

the meter box is recessed- so would now probaly struggle to wire between a reccessed and an additional surface one

for the switch fuse for the out building/shower. Is a builder involved with the job?

J.C.E · Jun 19, 2017

Leesparkykent said:
for the switch fuse for the out building/shower. Is a builder involved with the job?

yes but shells all built now (his sparks broke his foot) so I got the job
(his crap temp supply- on the other side of meter box (see photo)

If I get rid of the old meter at the bottom and get the client to get a new small digital meter in place of the big dial meter I can probaly squeeze a 100a switch fuse iso in there and 25mm to c/u in house

then a upfront 50a mcb in the house c/u- and 16mm out to the outbuilding

[ElectriciansForums.net] electric shower in outbuilding

Leesparkykent · Jun 19, 2017

J.C.E said:
yes but shells all built now (his sparks broke his foot) so I got the job
(his crap temp supply- on the other side of meter box (see photo)

If I get rid of the old meter at the bottom and get the client to get a new small digital meter in place of the big dial meter I can probaly squeeze a 100a switch fuse iso in there and 25mm to c/u in house

then a upfront 50a mcb in the house c/u- and 16mm out to the outbuilding

View attachment 36914

would take the builder about half an hour to cut in a recessed box and cost about £30 to buy.with this you could house a switch fuse for the house and another for the outbuilding. In the existing you could install something like a rec 2 for a single point of isolation. Much better than having to run the SWA internal and also having the distribution circuit on a circuit breaker where you will struggle to achieve any discrimination... just my thoughts.

LankyWill · Jun 19, 2017

does the property have a septic tank?

electric shower in outbuilding

J.C.E

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J.C.E

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LankyWill

Leesparkykent

7029 dave

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J.C.E

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J.C.E

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LankyWill

Leesparkykent

J.C.E

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J.C.E

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Leesparkykent

J.C.E

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Leesparkykent

LankyWill

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