Will this be ok as a cable route to upstairs

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Michaelsf90

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So my shower is wired in 6mm. It's a 9.5kw. When I do the bathroom I'm altering it to a 10mm. The major problem is the existing cable is fed up the cavity into the loft and then down to the shower. The previous owner or a previous owner has had cavity wall insulation put in. So I cant use that route and I know cables going up the cavity is a no no. I'm an electrician but not domestic. Commercial and industrial. Mainly deal with trunling and conduit. Could I use the nib in this picture as a route to upstairs? It's a wall going into the kitchen at the end of the hall. The wall separating the hall from the kitchen. It's the stairs on one side and the wall to the back room on the other side
 

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You mean that little return off the stairwell? If the cable is within 150mm of the actual corner (and protected by an RCD) then it'll be in a safe zone & acceptable. What's the plan at the top- push it through the floor void?
 
Yer the little bit of wall between the stairs and the casing. However thinking long term I need a wider route as I plan on slowly rewiring. The consumer unit is at the bottom of the stairs in the cavity in the wall. I'd need a 1.5mm for downstairs lighting. A 2.5mm for the boiler, 2 2.5mms for upstairs ring main and a 10mm for the shower. At the top I would have drilled behind the caving and got into under the floor on the landing. I will come back with another possible route. Its tricky because above the consumer unit is a bedroom with fitted wardrobes on the wall on that side. The hall is closest to the consumer so I need a way of getting up in the hall really
 
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You don't need 1.5mm cable for lighting circuits. Use 1.0mm cable. Nor do you need 2.5mm cable for a boiler.
 
I plan on capping them so I still wont fit all them up that section of wall
 
considering you won't be able to buy gas boilers in 5 years time, maybe running a 2.5mm cable is future proofing? maybe bigger ?
 
I may have worked out an easier option. Run all the cables under the floor downstairs to under the actual stairs. We have a cupboard that goes under. Inside under the stairs run a surface pvc trunking up. Drill through at the top and come out onto the step where I am stood. Then run behind the next step and onto the landing floor. What's peoples thoughts. Excuse the horrible dirty carpet. It's getting replaced once work has been done
 

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Can you not drill from the under-stairs cupboard through to the bathroom under-floor space?


Michaelsf90 said:
It's on a 16A RCBO so using 2.5 saves me changing that haha
Click to expand...
:?: 1.5mm² T&E would do. (1mm² T&E actually if you ignore the daft table about 'power circuits' whatever they are)
 
No as the bit where I'm stood under the stairs is a cupboard in the kitchen. I could drill through and get into the void under that step just about from under the stairs. Well I dont know 100% but only one way to find out
 
The original cables go straight up the wall above the consumer unit into upstairs front bedroom which has fitted wardrobes on that wall so it's now inaccessible
 
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