loft Conversion

[shiner]

Hi everyone,

I have just got back from my friends place, he is doing a loft conversion. i noticed that he has run the new wiring for the lights and ring main out. but my concern is that he has run it under the new joist and on top of the insulation. For the lighting circuit it is between the insulation and the eves of the roof.
I thought you had to run the cable clipped to the joist and drill a hole through where required and to keep it away from the insulation.

i thought i should just check before he got to the point of no return.

Thanks

 

[somersetsparks]

As long as cables are of the correct size to cope with being immersed in insulation then fine, on the point of clipping, some might argue that if you clip it to every joist, A- You can't use them as draw wires in future and B- they are more likely to be hit when plasterboarding. I woulde go with the general rule of making sure they are secure enough to be not drooping all over the place.

 

[trev]

As Somerset says, as long as the cables have been correctly selected then it should never be a problem. Is your man a spark? If so then he should have a common sense approach to his cable routes, if he isn't well I hope he's lucky.

 

[shiner]

The cables were 2.5 and 1.5. he has done a short course as far as i'm aware.
The cable aren't dropping. The 2.5 is under the new floor and obviously the 1.5 is in the roof space.

 

[trev]

In your position I think I'd leave my "friend" to it. Why does the word bang spring to mind

 

[GLENNSPARK]

Hi everyone,

I have just got back from my friends place, he is doing a loft conversion. i noticed that he has run the new wiring for the lights and ring main out. but my concern is that he has run it under the new joist and on top of the insulation. For the lighting circuit it is between the insulation and the eves of the roof.
I thought you had to run the cable clipped to the joist and drill a hole through where required and to keep it away from the insulation.

i thought i should just check before he got to the point of no return.

Thanks

look in the OSG for cables run in more than 500mm of insulation....
then de-rate the cable accordingly....
seemples...

 

[shiner]

the cable is only sitting on top of 100mm insualtion

 

[Outspoken]

Could I also point out that you are NOT ALLOWED to drill holes in any beams that support roofs, and that includes the rafters...

 

[odawire]

Could I also point out that you are NOT ALLOWED to drill holes in any beams that support roofs, and that includes the rafters...

is that in the regs?

 

[GLENNSPARK]

the cable is only sitting on top of 100mm insualtion

put it down as method 100....
you should still be OK with this.....

 

[trev]

Another millimetre and it would have been method 101. There's a room named after that you know

 

[Outspoken]

is that in the regs?

I can't remember if it is specifically in the Regs, will check, but I do know it's in the Building Regs!!

 

[Knobhead]

is that in the regs?

How about common sense. If you draw out the beams in a roof you will find some are under tension.

That's not covered by the regs though.

 

[odawire]

How about common sense. If you draw out the beams in a roof you will find some are under tension.

That's not covered by the regs though.

Well obviously you need to make sure you won't compromise the strength of the structure.

 

[Stroppy]

That's a building regs thing, not electrical regs. The IET don't care if the roof caves in, as long as the cables are safe!

 

[Rockingit]

Could I also point out that you are NOT ALLOWED to drill holes in any beams that support roofs, and that includes the rafters...

Not saying you're wrong, but can't say that I've ever seen that on paper anywhere. As others have said, its all down to common sense.

 

[Stroppy]