• Welcome to the new forum. We're now hosted on ElectriciansForums.net rather than ElectriciansForums.co.uk - Chat about the forum upgrade by CLICKING HERE

Welcome to our Electrical Forum - We started out providing electrical advice just for the UK - But now we have specific advice for the USA too! - Register for free and share American Electrical Advice.

Discuss Shower Installation 8kw to 8.5kw in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Status
Not open for further replies.

Mikedry

EF Member
Hi

I have an 8.5kw shower which I wish to replace an 8kw shower with.
I'm not sure which thickness cable I already have but I think its 6mm. Will this be ok for the 8.5kw shower? I attach a pic of the current 8kw shower with cables

20180522_213748.jpg
 

Baker1988

Electrician's Arms
Whats the installation method? Is it in insulation or any thing like that? What size mcb/rcbo is it on in your consumer unit?
 

Gavin John Hyde

Electrician's Arms
CCTV / Alarms
couple of points...
How is the cable installed... surrounded by insulation etc...
How long is the cable run?
Does the circuit have rcd protection back at the board?

Also im not fully 100% on the rules in scotland... but does the part p special locations apply up in scotland? if so you might need to get a suitable electrician in to do the actual connections and test it.
 

Mikedry

EF Member
Cable goes into roof so could be under insulation. Will have to check tomorrow. Not sure how to tell the size of the MCB? Sorry a bit of an amateur!
 

Murdoch

Electrician's Arms
Most shower installation instructions ask for rcd protection on the circuit. Does your fuse board have rcds ?
 

Mikedry

EF Member
Yes it does. Just not sure what the rating of the shower one is. A new board was put in about 5 years ago and I'm assuming all was ok for the 8kw shower we already have.
 

Baker1988

Electrician's Arms
It will more than likely be a 32A mcb but im not sure is there not any markings or labels on your consumer unit saying shower as the ine above it will say the size on it, and if the cable is covered by insulation then i would say it is defiantly not sutable for a bigger size shower, i wouldnt even put the shower you have on a 6mm cable that is covered in insulation.
 

Wilko

Electrician's Arms
Hi - just a friendly reminder that those cables may be live and be a hazard to you. Even if you have turned off the circuit breaker it may not be wired right and so still be live. I always recheck with an approved 2 pole voltage tester to ensure its dead and not me :) . The cable should have its size written on it, as anything else is a guess from a pic.
 

Mikedry

EF Member
Pic attached of board. Blue RCD says 63amp on it but nothing on the actual shower switch to give an indication of rating

20180524_230449_resized.jpg
 

Baker1988

Electrician's Arms
It says on the mcb B40 so it is a 40A mcb and if it is actually 6mm and not 10mm then i hope it is not in insulation and is actually in free air or clipped direct as its called as any method other than clipped direct the current carrying capacity is to low for the MCB and too high for a 8.5kw shower, does it say on the cable the actual size, but please be carefull and dont poke around to much as it may give you a shock turn it off at the isolator first if you have not already
 

Mikedry

EF Member
Think I'll have to get someone in as I'm a bit lost with all this. It doesn't say a cable size on it. I had hoped it may be an easy swap but I better get it checked and tested properly
 

Gavin John Hyde

Electrician's Arms
CCTV / Alarms
To be fair to the op he sounds quite reasonable and took time to reply and listen. And hopefully a local spark will help him out.
Hence the replies were good. If all the people coming on asking for advice were like him life on here would be dandy... sadly we get too many diyers wanting to save a few quid getting funny when told something they dont like.
 

MDJ

The Muppet Police
Forum Mentor
Electrician's Arms
Trainee Access
Personally from the info supplied I think it will be fine, 8 mtrs of cable and it is 6mm2, can't see a problem with it handling 8.5 KW, now the 40 amp MCB? well it is there to protect the cable, can the 6mm2 cable cope with 40 amps? something for you new sparks to work out, we cannot tell you everything o_O
 
  • Like
Reactions: DPG
Status
Not open for further replies.

Electrician Talk

Electrical 2 Go - Electrical Supplier and Electrical Wholesalers
Electrical Insurance
ElectriciansForums.net (formerly known as ElectriciansForums.co.uk) was setup in April 2006 to provide free electrical advice to both professional and DIY electricians. Whether seeking advice for auto electrics, trying to find electrical installation condition reports (EICR) form downloads, or whether you're here just to talk to other electricians; we've been a first-choice website for tens of thousands of sparkies for well over a decade.
Top