Better way of doing this....?

[sythai]

Working on a bathroom refurb at the mo....

Just decided they're having a new tank in the airing cupboard which needs supplies for 2 x immersions (3kW)

Nightmare job running new cables back to CU, basement flat concrete floors /ceilings etc. Opposite side of building.

But I can re-use the old 6mm shower feed. Was thinking could use this as a submain, supplying 2x16a mcbs in an enclosure in the airing cupboard, these then going out into a couple of 20a DP switches and on to each immersion.

Anything wrong with that/ better way, my only query really is the enclosure with the 2x mcbs in it, would this require its own local DP switch?


Cheers Sy

 

[tigerpaul]

Why don't you use a little 2 way board, it'll have it's own main switch then..

 

[sythai]

Why don't you use a little 2 way board, it'll have it's own main switch then..

It's just so tight on space thats all, will be lucky to get the enclosure in where it will be readily accessible. Every inch counts on this one!

If it is a requirement that I have main switch then I have no option but to find some way of fitting a small 2way CU in.

:smiley2:

 

[ClarkeTheSpark]

Thats what I did with a similar dilemma, small RCD garage unit with a spur coming off a 16A breaker for each spur. Marlanvil (i think) and Wylex do fairly small ones

 

[Darkwood]

Run the 6mm shower supply through a 45a switch then split to 2 mcb in a enclosure, this way the individual flexes have overload protection, the imm' heater can be isolated at one point locally and 40amp mcb covers cable if calcs suit the situe', mcb discrimination will only be partial but its rare you can acheive it in domestic anyway so ok.

This dosn't show auto or timer controls but gives you the jist' as a manual operation.

 

[sythai]

Thanks Chaps

 

[jpm646]

If the 2 elements are in the same tank won't they b 24hr an e7 if so couldnt u take 6mm in to a time clock then the two flexes to the elements and down rate the 6mm at the board to 16amp??

 

[sythai]

If the 2 elements are in the same tank won't they b 24hr an e7 if so couldnt u take 6mm in to a time clock then the two flexes to the elements and down rate the 6mm at the board to 16amp??

Good point come to think of it that may actually be the case, I'm back there next week so will check it out..... never seen a dual immersion set up with eco 7 before, but theres always a first.


If thats the case, problem solved and I will probably need something like this :

http://www.heatingcontrolsonline.co.uk/horstmann-economy-quartz-timer-p-54.html

​

 

[Dave 85]

Why not just use 2 Fcu's as protection? Am I missing something here?

 

[sythai]

Why not just use 2 Fcu's as protection? Am I missing something here?

3000/230 = 13.04amps .... bit too close for me.

Thanks anyway

 

[Dave 85]

Nonsense. A 13 amp fuse doesn't pop on anything near 13amps....surely you guys realise this?
Just unnessecary work putting a CU in for a pair of immersions.

 

[StuSpiers]

Seen it done 1000's of times.

3000/240 = 12.5

one calculation is by the book, one is a reality.

 

[Simlec]

The small board way is the only way for me! 2 x 6mm or 1 x 6mm + 1 x 4mm will not go in to a 13amp fused outlet as normally stated on!!

 

[telectrix]

but it's not 230, it's 240.

 

[Rockingit]

Good grief! Nothing like over engineering a job! IF you DON'T have e7 to contend with, take the 6mm into a double pattress and out to 2 x 3kw FSU (suggest Click would be good for that) and feed it from a 32a MCB off the CU.