10mm T+E clipped externally

[Theorysparky]

It needs to be run 15m down a dark alleyway (no exposure to sunlight )with one bend

the wall has been rendered white

i was thinking 25mm white conduit

its to feed a 10.5 kw shower

conduit or not ????

 

[ianmacd]

Conduit for sure to protect the cable. Just because it doesn't get any sun directly on it, doesn't mean its not exposed to UV.

 

[Lee321]

can you not fish it up the cavity?

 

[AndyD1]

TheorySparky,

Before going down the cavity route check out this link

http://www.voltimum.co.uk/news/9016/cm/snag-18---cables-in-cavity-walls---thermoplastic--pvc--insulated-and-sheathed-cables-should--normally--not-be-installed-in-external-cavity-walls-.html

 

[Theorysparky]

Andy

thanks for the link

cavity run is not a solution as the terraced house has been extended to the rear and guess what ? thats where the bathroom is with no loft access.

Down the alleyway throught the wall to the switch outside the door into bathroom,trunking to floor across to shower tray up to shower

not going to be impressed with my estimate !!!! main and supplementary bonding needs doing aswell

 

[AndyD1]

Conduit it is then!

 

[Lee321]

Andy thanks for the link

cavity run is not a solution as the terraced house has been extended to the rear and guess what ? thats where the bathroom is with no loft access.

Down the alleyway throught the wall to the switch outside the door into bathroom,trunking to floor across to shower tray up to shower

not going to be impressed with my estimate !!!! main and supplementary bonding needs doing aswell

trunking likely to get wet?

 

[Theorysparky]

ok i meant trunking to the floor

cable under boards chased up to the shower unit !!!!!!

 

[Lee321]

 

[M107]

swa between adaptable box either end of the alley.

 

[binky]

It needs to be run 15m down a dark alleyway (no exposure to sunlight )with one bend the wall has been rendered white

i was thinking 25mm white conduit

its to feed a 10.5 kw shower

conduit or not ????

I've done this before to avoid massive run through house. Used trunking for UV and mechanical and left ends open where water wasn't going to cause a problem to help dissipate heat, not that a shower is likely to be running for a long time.

 

[Voltimax]

Do you know I was once told by a director of Napit, that running cables on exterior walls of houses was not acceptable, especially earth wires, whether they be in conduit or not. He said it would soon be a code of practice within Napit

 

[Zeespark]

I personally hate seeing cables run up and down the sides of houses, - Me being asthetically anal, but He is bang out of order for it to be a code of practice issue.

AndyGuinness

 

[Voltimax]

He is bang out of order for it to be a code of practice issue.

Yeah that's what I thought and so did Chuck.

 

[bengie]

if your running it externally in conduit and it doesn't pass through any insulation then why not wire it in 6mm as wired like that its rated at over 40A(41A i think) to cut the costs a little bit?

 

[bengie]

i have just checked my regs and yes T&E in conduit attached to masonary is reference method B and gives 6mm T&E a rating of 41A and 10mm T&E a rating of 57A.

HTH.

 

[Theorysparky]

When i do all the calcs i can just do 6mm with a 9.5 kw shower

the customer has excepted the price for 10mm so i may just go with it.

allows for a bigger shower

 

[Lee321]

i have just checked my regs and yes T&E in conduit attached to masonary is reference method B and gives 6mm T&E a rating of 41A and 10mm T&E a rating of 57A.HTH.

you can't apply that method and rating for all of it tho bengie

?

 

[matt.leung]

you may wanna go with a 25mm conduit with 10mm T&E.

 

[green-hornet]

Just done a rough calc for you

Supply voltage = 230 Volts

Ib - design current = 45.7 Amps

Protective device type = MCB typeB

In - protective device rating = 50 Amps

Length of run of cable = 15 meters

Power factor = 1

Cable Type : General purpose PVC - Singlecore

Installation Method : Non-sheathed cables in Conduit on a wooden or masonary wall, or spaced < 0.3 x cable diameter from it.

method B

Ambient temp = 30