Electric Shower Problem?

BulletBob

Is it safe, to run a 6mm cable on 10.5kw Electric Shower?


As a local Part P Electrician thinks this is fine??? But it says 10mm must used on the instruction Manual!


Thanks in Advance

shammyjack

Consult your local sparky again as it all depends on the length of the cable run . If a long cable run I would go with the 10mm , better more expense than overheating cable and a fire !

shammy

BulletBob

shammyjack wrote: »

Consult your local sparky again as it all depends on the length of the cable run . If a long cable run I would go with the 10mm , better more expense than overheating cable and a fire !

shammy

Thanks for the Reply,

I think he's trying to cut corners using 6mm

24_hour_sparks

very unlikely that 6mm with cope with 45 amps to feed that shower.
i would definatly use 10mm, make sure he installs bathroom bonding also if required, and MAKE SURE you recieve a minor works or completion certificate as required.
ask him if he/she will register the job with your local council builing controll for part p approval as well if required as presumibly the work is in your bathroom.
if not you should register it at a rough cost of £120, or do what some people do and just dont bother. ?.

BulletBob

24_hour_sparks wrote: »

register the job with your local council builing controll for part p approval as well if required as presumibly the work is in your bathroom.
if not you should register it at a rough cost of £120, or do what some people do and just dont bother. ?.

I don't understand???

Why would I need to register a small job like this with building control???

nickcardwell

BulletBob wrote: »

Thanks for the Reply,

I think he's trying to cut corners using 6mm

its not in his interest to cut corners using 6mm. You can use 6mm IF the cable run is short to the Cosumer Unit (cable run is not the actual distance from the consumer unit to the shower, but the actual length the cable goes to it).

If it was me, job doing is a job worth doing right , get 10mm.

BulletBob

nickcardwell wrote: »

IF the cable run is short to the Cosumer Unit (cable run is not the actual distance from the consumer unit to the shower, but the actual length the cable goes to it).

Cable run is about 15 Meters, but it will be a job getting a 10mm laid.

Hobbit_X

You need 10mm.

Running in the cable is the worst part. 10mm cable is dear, but it is what you need.

Although this is not totally accurate for AC circuits

Power = Current X Voltage
10.5KW = Current X 230
which gives a current of 45 Amps

45 Amps through 6mm. Is really the max limit. Now you say 15meters in length - no chance.
the two issues are the current and whether the cable can take it, and the voltage drop over the length of the cable. I am certain that you would loose too much power although the shower would probably work

For 6mm cable you would normally use a 32Amp circuit breaker. This would not be suitable for a shower of 10.5 KW