Wiring a power socket in celotex

[Para1961]

Hi
I am doing a loft conversion in a bungalow

The question being is I am insulating the walls with 100mm celotex as per BC.
What I need to know is how to fix power sockets in this stuff?

There will be of cause plasterboard used

Will it be ok to use dry lining boxes?

Thanks

 

[PrenticeBoyofDerry]

Dry lining boxes will be okay or depending on wall type, you could fix back boxes to solid walls or make provisions in walls with cross timber (noggins) to screw boxes on to.
As the cables are routed in walls that contain thermal insulation, you will require to use the correct reference method correction factor for cables, and also make yourself aware of permitted safe zones for cables in floors and walls, and the requirements of 30mA RCD protecting for buried cables and socket outlets.

Useful links:
floors
walls
thermal insulation cable correction
RCDs

 

[ban-all-sheds]

Hi
I am doing a loft conversion in a bungalow

The question being is I am insulating the walls with 100mm celotex as per BC.
What I need to know is how to fix power sockets in this stuff?

When you applied for Building Regulations approval for the conversion, what did you say would be the way you would ensure that the electrical work would comply with Part P?

 

[Scoby_Beasley]

If you are worried about compromising the integrity (love that phrase!!) of the insulation, I know you can get dry line boxes that come with a fire rated, and I assume, sound/insulation, stuck to them. Can also get K/O boxes.
I think the dry liners are by Appleby, can't be sure as its been a year since I last used them in a similar situation (loft conversion). What I do know is they aint cheap! But if they help you to comply with the regs, what price money?? (does that last bit sound wrong?)

 

[NHS]

It states that you can do the electrics yourself if you are competent and get it signed off by a registered electrician who is part P

 

[NHS]

Many thanks Scoby.. i have brought the dry lining boxes so all is good

 

[ban-all-sheds]

It states that you can do the electrics yourself if you are competent and get it signed off by a registered electrician who is part P

No it doesn't.

 

[bhm1712]

It states that you can do the electrics yourself if you are competent and get it signed off by a registered electrician who is part P

No it doesn't.

Agreed.

That would mean anybody could do DIY electrics, and get a sparky to sign it off. As we all know, thats not allowed.

 

[parauk]

QUOTE

Where work is being carried out by an uregisistered electrician or on a DIY basis you will need to subit a part P notice to BC.
This will incure a charge of employing a competent electrician on your behalf
The electrician will carry out the relevent testing and issue a certificate where the work id found to be in compliance.

End Quote

 

[bernardgreen]

Or maybe the building control will accept the test results supplied by the DIYer if the DIY can show competance in design, install and testing. It can happen but discuss with the building contro firstl.

It has to be genuine competance and not over confidence.

 

[Chri5]

Most lofts will have a void behind the stud work, run cables in void away from insulation and fit 3" bits of conduit to the back of the dry line box.

Thus the cable isn't in the celotex, the celotex will need a 40mm dig out for the dry line box footprint.

If also makes sense to stop the conduit after the cables are in to prevent cold air blowing through the void to the socket, mastic or a blob of putty does the job.

 

[PrenticeBoyofDerry]

Is this a competition, on how many differing user names of the same person can be used on the same thread?
So to which ever alter ego this applies to:
If routing cable through thermal insulation and/or conduit, appropriate cable calculation will be required. This is because routing cable within thermal insulation and/or conduit will reduce the safe current carry capacity of the cable.

 

[bhm1712]

There is a difference between notifying BC of doing the electrics yourself and then BC sending a registered electrician to test the installation, than doing the work DIY and getting a sparky to test it in order to provide a certificate which in effect is saying that the sparky has done the installation as well as the testing.

It's not as easy as saying that 'it states that I can do the work myself and get somebody to test it afterwards'

Designing and installing electrics is not as easy as a DIYer thinks and if he is having to ask about stuff like this then He is obviously not a competent domestic electrical installer.

 

[Para1961]

Forgot to say but interesting thoughts that all I am doing is running the wires as any DIY jobber can do and a qualified sparky will connect and check the wiring.

Thanks

 

[EFLImpudence]

Forgot to say but interesting thoughts that all I am doing is running the wires as any DIY jobber can do and a qualified sparky will connect and check the wiring.

Wrong again - unless the 'qualified sparky' is supervising you throughout the work.