8.5kw shower wires in 4mm, burnt terminals | Page 3 | on ElectriciansForums

8.5kw shower wires in 4mm, burnt terminals

Discuss 8.5kw shower wires in 4mm, burnt terminals in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

A job I'm starting a new build bungalow has been specified 16mm twin and earth for 10.5kw shower complete with a wall mounted isolation switch outside of the ensuite, which is a stud wall!
Oh the joys.
 
Ian1981 said:
A job I'm starting a new build bungalow has been specified 16mm twin and earth for 10.5kw shower complete with a wall mounted isolation switch outside of the ensuite, which is a stud wall!
Oh the joys.
Click to expand...

Good luck.

Is that due to cable running through alot of insulation?
Never seen a 16mm at a shower before.
At least you can install a double 47mm metal box in the stud partition
 
Apparently 3 layers of insulation are going in so looking at reference method 101 even 16mm twin only pulls 46 amps reference method 101.
At 10.5kw I'm looking at a loading of 43-44 amps so the 16mm will be able to handle it.
I need to consult the builder and maybe request some boards are fixed above the insulation so a 10mm can be clipped above the insulation.
They won't budge to a lower rated shower tho.
Doubt I'd even manage to fit a 47mm box in the wall as the studs are only about 50mm deep
 
That is a narrow stud
Thankfully always 4x2 with the joiners we work with.
Would not like to terminate a 10mm in anything less than a double 47mm box.
To be honest don't like wirring showers fullstop :tearsofjoy::tearsofjoy:
 
Ian1981 said:
Apparently 3 layers of insulation are going in so looking at reference method 101 even 16mm twin only pulls 46 amps reference method 101.
At 10.5kw I'm looking at a loading of 43-44 amps so the 16mm will be able to handle it.
I need to consult the builder and maybe request some boards are fixed above the insulation so a 10mm can be clipped above the insulation.
They won't budge to a lower rated shower tho.
Doubt I'd even manage to fit a 47mm box in the wall as the studs are only about 50mm deep
Click to expand...

Don't like using them, but could u fit a 47mm faster fix box to give u that extra room.
 
Lee42 said:
That is a narrow stud
Thankfully always 4x2 with the joiners we work with.
Would not like to terminate a 10mm in anything less than a double 47mm box.
To be honest don't like wirring showers fullstop :tearsofjoy::tearsofjoy:
Click to expand...
I'll get round it as I really don't want to be installing 16mm but it's not mine or my company's spec
4mm ring circuits as well.
 
Last edited:
If there is any kind of airing cupboard then a suggestion if re-routing the cable isn't an option would be a contactor operated by a lighting pull switch, cable size thus of no concern then. If the designer has issue with this then give then let them try terminate 2 x 16mm T&E into a standard shower switch and deep box.
 
If I can manage to get my brain into gear,I think I will look for a logical regulation which frowns on such practices of using larger than life cable sizes on everyday accessories,extra naughty I believe :)
 
slightlyoff topic, but hre's something that has been bugging me for ages.

when applying the temp. factor ( 1.2 ) to your loop impedance as per osg., why apply it to the whole Zs value and not just to the R1+R2, when the supply cable from sub-station is never going to approach anything like 70 deg. ????

thoughts???
 

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