cable rating (not another cooker one!)

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hello and thanks to all that answer,

after looking at many cable selection tables could somebody please confirm what a cable clipped direct to a wall and plastered over (no conduit) comes under. i'm assuming "clipped direct" is for surface mounted.

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If you go back a few pages (assuming that's from a regs book and not the OSG which I'm not familiar with) the methods of installation are explained.
 
thanks, i've got a computer copy of the regs its hard to use for reference!
looking at it, you use clipped to the wall (method one) for plastered over.

it doesn't make much sense to me would of thought a cable in a conduit would be capable of drawing more amps than one plastered over. does the conduit not provide an increased space for cooling? any thoughts?

P.S just printed off a copy of the osg, not much use?
 
The plaster/blocks in contact with the insulation will provide a better heat sink than the air in the conduit
 
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ashm said:
thanks, i've got a computer copy of the regs its hard to use for reference!
looking at it, you use clipped to the wall (method one) for plastered over.

No, you use;

Page 210 table 4A1, Cables Embedded Direct in Building Materials Method 1, sheathed cables embedded directly in masonry, brickwork, concrete, plaster or the like (other than thermally insulating material)
 
I'm getting confused - could someone tell me what size cable I need to install for a cooker radial circuit, 15m run from consumer unit, 13.7kw cooker.

Thanks
 
13700w / 230v = 60A

For full load:

Reference method C: 10mm²
Reference method B: 16mm²
Reference method A: 25mm²

Diversified load:

10A + 30% + 5A = 30A

Reference method C: 4mm²
Reference method B: 6mm²
Reference method A: 10mm²

A = enclosed in conduit in thermally insulating wall
B = Conduit on wall
C = Clipped directly to wall or embedded in plaster etc.
 
Thanks, could you tell me what size MCB I would need as well


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Moderator's note:

Use the "Reply" button (not the "Quote" button) and type your reply into the panel.

I have corrected this one for you.
Mod Rupert
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50A MCB and 10mm² cable* for close to full load.
40A MCB and 6mm² cable* for a healthy medium.
32A MCB and 4mm² cable* for diversified load.

*if clipped direct, see previous post otherwise.

Davy
 
Hmm. If you need these basic questions answering, do you have enough knowledge to do the work safely?
 

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