New shower install

[Scotty Parker]

i am installing a shower in my bathroom in the uk.

Can i run the wiring to the shower in mt4 mini trunking or do i have to chase the walls and bury it. I dont really want to carve up my tiles to chase if i dont have to.

I am using 10mm cable running it out, inside trunking,  to a 45 amp double pole switch(double box) with a 47mm deep back box then down under the floor to the consumer to a 45 amp type B MCB.

 

[Doc Hudson]

Welcome to the forum,  There is no requirement to have to conceal any wiring for a circuit alteration or addition. Surface mounted wiring clipped direct, or enclosed in conduit or trunking are all acceptable installation methods. However different installation methods will each have de-rating values which affect the overall current capacity of a cable. From the limited information you have given a single 10.0mm cable in surface trunking should be suitable for connecting to a 45a MCB.

However you have no mention of the overall length of the cable run, or your method of providing 30ma shock protection, or how you can confirm the Insulation resistance or Earth loop impedance values are correct? In addition to the standard Electrical Installation Certificate that should be issued for any new circuit wiring, If the work is carried in in England or Wales,  you will also need a building regulations compliance notification for it to be legally correct. Are you doing the testing and certification yourself or do you have an electrician testing it for you?  Without the correct electrical tests as per BS7671, with calibrated test equipment I would never suggest wiring a new shower circuit could be safely undertaken as a DIY project.

Doc H.        

 

[binky]

doesn't look nice, but it is acceptable practice. If doing this I prefer to mount the shower fairly high on the wall and run down from ceiling, assuming some loft access is available. ONly thing to watch is water ingress along the cable, again, shouldn't be an issue as most showers are a designed to allow for this, but bear it in mind when terminating the cable.

 

[Murdoch]

And if you live in England or Wales there is Part P to contend with too................

 

[Scotty Parker]

Thanks guys, i know its not pretty but the walls are super thick ones not Stud. I am using RCD protection and an electrician mate of mine is wiring the board for me as it gives me the creeps. I am just doing the leg work.

oh and a healthy dose of sealant on top of the shower where the wires enter should help  :innocent

 

[Evans Electric]

Sounds OK to me , your electrician mate will/should / needs to /   connect at the board  ,  test the circuit , test the RCD  etc .