10 kw Electric Shower

[JohnW2]

And when I don't KNOW I won't assure ...

I wasn't "assuring" anyone about anything - I was merely asking you what you considered to be the maximum permissible voltage drop for an electric shower. Your reply was that you "don't know", but I presume that you accept BS7671's "deemed to satisfy" figure of 5%?

Kind Regards, John

 

[JohnW2]

garash: can you give us a rough idea of how long the cable is - from your consumer unit to the shower? Is there any possibility that it is as long as 37 metres (about 120 feet)?

Kind Regards, John

 

[Iggifer]

I would be more concerned about installation method rather than length of cable. Insulation is much more likely to play a factor than length. For all we know, it goes up into the loft, across the width of the house, covered in 500mm of insulation, and drops down to the shower

 

[JohnW2]

I would be more concerned about installation method rather than length of cable. Insulation is much more likely to play a factor than length.

So would I - as I said, it's CCC that matters, not VD. However, BAS was going on about VD, and installation method has no effect on that (one determines VD using the highest permissible conductor temp).

Kind Regards, John

 

[ban-all-sheds]

However, BAS was going on about VD

Actually, what I said was "the length might be too great given voltage drop for a larger load". And that is correct - it might be

 

[JohnW2]

However, BAS was going on about VD

Actually, what I said was "the length might be too great given voltage drop for a larger load". And that is correct - it might be

Yes, it "might" be - as I said, that would be the case if the length were greater than ~37m for 6mm² or ~62m for 10mm². I am waiting for the OP to tell us what length we're actually talking about but, if I were a betting man .....!

Kind Regards, John

 

[Steve]

Y'all scared him off with your bickering.

 

[JohnW2]

Y'all scared him off with your bickering.

If he could/would tell us what the cable actually is, and how long it is, then there would not really be any scope for bickering, and we might even be able to tell him whether we agree with his electrician that the cable needs replacing/upgrading - which is what he wanted to know.

Kind Regards, John

 

[flameport]

4kW electric showers did exist, but at a time when 10mm cable would not have been used for anything in a house.
Cable would not have been replaced unless fitting a new shower, so it's very likely the cable is not 10mm. Probably 4mm or the non-metric equivalent.