Questions to sparkies

[golf-sib]

Basically I got a loop, I want to run it outside the house and up the wall (in conduit) and then back into the house to supply power to an extractor fan in the bathroom that has a humidity sensor.

Would this be fine and meat all the latest nonsense like 16th edition etc, does the conduit material matter, plastic or metal?

Ideally I don't want to run it up the inside as the bathroom is half tiled and I'm not willing to take it up.

Also how many cables can I run in the conduit, as I want to spur an additional wire off for a floodlight.

Thanks in advance?

[chrisowen85]

Can you not run it through the loft? the fan can be connected to the lights in the bathroom so no need to be on the socket circuit

How about spuring off a socket close to the place you want the outside light to be? Doesn't have to come from downstairs, means less cable and no conduit if you can drill straight out?

[Seanl]

Does sound an odd way to do it. If you have to though, pretty sure you'll need armoured cable for external use regardless of whether conduit is being used. (Dont quote me on that). Oh and its 17th Edition now....... By the way, I'm not an electrician, just trying to get my post count up! 

[golf-sib]

Well it's the nearest feed and by going outside its the easiest route.

Can't go the roof/loft way due to the design off the house:


___________
                    \
    Loft            \ ___________
____________ /                   /|\
                     /                   / |  \ Neighbors
                    /--------------/   |   \
 Bedroom      | Bathroom   |   |    \
___________|__________|   |    |
                    |                  |   |    |
   Reception   | Kitchen      |   |    |
                    |                  |   |    |
___________|__________|__|__|

Basically the bathroom is not that high so the ceiling is slanted the same way as the roof, so it's not accessible, doesn't help that the ceiling has been plastered recently in a pattern, which means this is a no go route  Misses won't be happy. 

Which is why I'm asking about the conduit idea as it really seems like the easiest way, if I was doing a full refurbish of the bathroom I'd feed it inside the wall, but as it's been done and not thought through I'm now stuck with this idea, be good to find out if armored cabled is required or not. (PS off topic section doesn't increase post count  )

[chrisowen85]

Looks like a right b!tch to do! You could drill through from the kitchen and take a 2.5twin and earth to the bathroom fan from a spur inside the kitchen. Same with the outside light, they both need to be on separate spurs though

[golf-sib]

I was planning on keeping them on separate spurs fed from the kitchen as I planned to fit a switch for the floodlight as I hate the PIR sensor things with a passion.

I imagine you can fit as many cables as you like in a conduit, providing there's room?
Any idea on what material the conduit needs to be or does it not matter?
Any specification on the cable required if it goes outside and into conduit?

Also the floodlight needs to be as high as possible due to the garden being raised and going up hill, so conduit I'm guessing is un-avoidable?

[chrisowen85]

They would both be ok run in 1.5mm twin and earth. Plastic conduit would be fine if it's sealed properly.
Would be best to go from the kitchen into an adaptable box with the conduit coming out of the top of it, you can take both cables up one piece of conduit, coming out the side of it using a t piece for the light if you need to?

[golf-sib]

I have conduit glue for the plastic stuff laying around for it to seal, I was thinking off doing the T-piece idea as well.

Whats this adaptable box you speak off?

[hobbiniho]

sorry but to me that sounds really dodgy could you not run it under the floor instead??, how long is the bathroom roof because it is possible to go "fishing" for wires and not disturb the celing  

[Dewey]

They would both be ok run in 1.5mm twin and earth. Plastic conduit would be fine if it's sealed properly.
Would be best to go from the kitchen into an adaptable box with the conduit coming out of the top of it, you can take both cables up one piece of conduit, coming out the side of it using a t piece for the light if you need to?

This ^^ A t-piece to the light then a conduit end box at the top, a 20mm conduit should be perfect for 1.5mm