Shower question

[Markymark1]

Hi and I wonder if someone can point in in the right direction to go. My old shower give up on me (7.5kw) and now I have bought a new one (9.5kw) wiring is 10mm and length is around 20m going into a memera 3 cu 30amp fuse. Would it be possible to put in a 45amp fuse carrier instead of the 30amp fuse carrier and put a 40amp fuse in. Any advice would be greatly appreciated.

 

[BS3036]

How have you established that it's 10mm?

 

[Markymark1]

I've measured the width of the cable

 

[BS3036]

And how did you convert the width of the cable into the cross sectional area of the conductors?

 

[sparkwright]

Wrong way to measure it.

Given the age of your consumer unit, your cable may well be as small as 4mm2, which is woefully too small for your new shower.

Memera 3 also suggests you may not have adequate RCD protection either.

Photos would help.

 

[RF Lighting]

Is the bare (may be in earth sleeving) earth wire in your shower cable a single solid core or 7 smaller strands twisted together?

 

[Markymark1]

Earth wire is single core

 

[sparkwright]

Possibly 6mm2 if you say that's a single solid earth wire. Looks stripey in the pic.

Can you take a picture of that unit just partly visible to the right of the consumer unit?

 

[Markymark1]

Another photo

 

[Taylortwocities]

As hinted at above, where is the RCD protecting the shower circuit? Or indeed any circuit?

 

[Markymark1]

There isnt one, only the fuse in the cu

 

[flameport]

Would it be possible to put in a 45amp fuse carrier

Extremely unlikely, all parts for that board are obsolete, any that do exist will be used tat from the likes of ebay.
45A were rarely used even when they were available new.

As there is no RCD, the new shower can't be installed unless you consider ignoring both the manufacturer's instructions and BS7671 is an appropriate thing to do.

 

[Markymark1]

Ok. Thanks for all the advice. What if I went back to a 7.5kw again

 

[Taylortwocities]

Ok. Thanks for all the advice. What if I went back to a 7.5kw again

You are still going to need an RCD, and 7.5Kw is weedy. Why don’t you do it properly. new circuit, RCD.

. Really, replace that ancient dist board, you know you are going to need to do it soon.
No other new electrical work is going to comply with regs until you do.

 

[EFLImpudence]

Do you think the same regarding a mandatory RCD installation when you 'replace' a socket?