Circuit protection for a 9.5KW Water Heater

[Edsentinel]

Hi

I need to upgrade from a 5kw water heater to a 9.5kw. At present its protected with a 32A MCB at the Main Dist Board, 6mm2 cable to a separate enclosure that contains a 32A RCD, then 6mm2 cable to the Heater. Can anyone offer any advice on the correct circuit protection i need?

Do i have to upgrade the cable to 10mm2 all the way from the Main Dist Board or just from the enclosure to the Heater?

Should i use a 45A rcbo in the Enclosure?

ETC

Eddy

 

[kme]

You would need to check the derating factors, and voltage drop associated with installation method and circuit length, before deciding on a cable size - it isn`t "one size fits all" I`m afraid......

KME

 

[m4tty]

Have you done your cable calculations as per bs7671?

 

[Edsentinel]

Its about a 20m run through plastic conduit, currently 6mm2.

---------- Post Auto-Merged at 11:48 ---------- Previous post was made at 11:45 ----------

Cheers KME thats what i thought 10mm2 all the way!

Any advice on MCB/RCD/RCBO?

 

[m4tty]

Does the conduit run through anythermal insulation? There are lots of other factors involved. Are you a sparks or is this your house?

 

[Edsentinel]

Yeah Im a sparks, more genys and temp installations. as far as im aware its plastic conduit all the way to the Main Dist Board.

 

[magwa the pict]

As said it needs calculated properly 1 scenario could take it to 16mm2 another down to 6mm you really need professional advice from someone on-site

Pict