A quick qu on extending ringing main...

[Theboynick]

Hi,
I've looked up every thread on this and not managed to find what I'm after!
My task is to supply an individual socket to an under-pavement cupboard.
In my kitchen there is an unused spur running into an unfused junction box under the cabinets (2.5mm).
Through the wall next to this is the boiler room.
Through the boiler room (about 1.5m across) is the under-pavement vent.

My questions are:
1)is this extension something I'm allowed to do?
2) either way I need to get the materials... The boiler room is well vented but still gets warm, say 30-35 degrees. What's the safest way to cable through here? Could I save time by using SWA for the cabling and thus leave it exposed?

Any help appreciated!
Nick

 

[chivers67]

My first thoughts were SWA before getting to the end of your post.

I take it the overall load won't be very high on this circuit? What will it be used for?

 

[Theboynick]

Probably for vacuum/pressure washer/occasionally a dehumidifier.
Only one socket so never more than one of these at a time...
Thank you very much,
Nick

 

[ban-all-sheds]

My task is to supply an individual socket to an under-pavement cupboard.

A cupboard under a pavement?

Is this just a house/flat with or in a basement which extends under the pavement outside?

Through the wall next to this is the boiler room.

People don't usually refer to the room where their 30-50kW-ish domestic boiler lives as a "boiler room" - that seems larger scale, somehow, and the high ambient temperature hints at that too.

What is the location/building/environment?

Through the boiler room (about 1.5m across) is the under-pavement vent.

Venting what to where?

1)is this extension something I'm allowed to do?

Don't know yet.

2) either way I need to get the materials...

If you're not going to be doing it, don't get the materials.

The boiler room is well vented but still gets warm, say 30-35 degrees. What's the safest way to cable through here? Could I save time by using SWA for the cabling and thus leave it exposed?

The concern is ambient temperature - using SWA makes no difference at all.

 

[Theboynick]

Thank you very much for taking the time to help.
I've tried to make things a little clearer below but it sounds like I need a more accurate idea of the ambient temperature the wiring will pass through?
Nick

My task is to supply an individual socket to an under-pavement cupboard.

A cupboard under a pavement?

Is this just a house/flat with or in a basement which extends under the pavement outside?

Yes exactly - but the kitchen is the end of the living area. The "boiler room" is adjacent to the kitchen but is accessed from outside. The under-pavement cupboards are also accessed from outside. So the wiring would be in existing structures and pass through walls into them.

Through the wall next to this is the boiler room.

People don't usually refer to the room where their 30-50kW-ish domestic boiler lives as a "boiler room" - that seems larger scale, somehow, and the high ambient temperature hints at that too.

What is the location/building/environment?
Boiler cupboard? It just has a boiler, hot water tank and heating controls in it, is accessed from outside and is well vented as the door has two letterbox size holes in it. Ambient temperature is a guess but I can check... What would be feasible/infeasible?

Through the boiler room (about 1.5m across) is the under-pavement vent.

Venting what to where?
Open vents to outside

1)is this extension something I'm allowed to do?

Don't know yet.

2) either way I need to get the materials...

If you're not going to be doing it, don't get the materials.

The boiler room is well vented but still gets warm, say 30-35 degrees. What's the safest way to cable through here? Could I save time by using SWA for the cabling and thus leave it exposed?

The concern is ambient temperature - using SWA makes no difference at all.

 

[ban-all-sheds]

<A big mis-quoted block of text which I can't be bothered spending my time trying to decipher.>

 

[Chri5]

Use this

http://www.tlc-direct.co.uk/Products/NY1dot5slash3.html

1.5 mm is rated to 15 amp, which since the fused spur will limit the load to 13 amp will be fine.

Operating spec:-

Temperature Rating
Fixed: -40°C to +70°C
Flexing: -5°C to +50°C

Now what isn't clear is the environment the socket will go in, is it likely to be exposed to weathering, water, damp?

If so use a ip rated socket such as mk master seal.

 

[Theboynick]

Thank you!
That looks like it's exactly what I need.
Yep I have ip rated socket ready to go!
Thanks again,
Nick