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Topic Title: Reference method
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Created On: 18 December 2012 09:39 PM
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 18 December 2012 09:39 PM
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chunk522

Posts: 126
Joined: 12 December 2010

Hi people
Whats the reference method for T+E in trunking on a wall ? as its not on the table 4D5
Im wiring a 9kw electric boiler and hoping to get away with 10mm
but after checking im unsure now, the boiler is only 2m away from the dist board and cliped direct 10mm will carry 64 amps
I was installing in trunking for neatness in the cupboard and couldnt find the reference so any thoughts/ help would be great

Many Thanks
 18 December 2012 10:11 PM
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daveparry1

Posts: 6113
Joined: 04 July 2007

Same as clipped direct, C. (I think!)
 18 December 2012 10:14 PM
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chunk522

Posts: 126
Joined: 12 December 2010

Thats what I thought dave !
 18 December 2012 10:36 PM
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daveparry1

Posts: 6113
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That's what I always use anyway Chunk, no ones ever questioned it on assessments!
 18 December 2012 10:44 PM
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chunk522

Posts: 126
Joined: 12 December 2010

Thanks Dave I will go with that, I have to travel 200miles to do this job, didnt really want any mistakes to go back and change so thanks for the help on this
 18 December 2012 11:03 PM
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aargeitakis

Posts: 141
Joined: 14 July 2005

Hi Chunk,

T+E in trunking on a wall is method B
have a look at the regs page 317, table 4A2, number 8+9 (third of the bottom), multicore cable in cable trunking on a wooden or masonry wall


Regards

Paul
 18 December 2012 11:29 PM
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aargeitakis

Posts: 141
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as you said there is no method B on table 4D5 but the current carrying capacity in trunking it is always less than clipped on the wall
 19 December 2012 01:32 PM
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GB

Posts: 357
Joined: 04 September 2002

Reference B
Then use table 4D2A
 21 December 2012 10:01 PM
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aargeitakis

Posts: 141
Joined: 14 July 2005

Hi Chuck,

just remember you said the boiler is 9KW so is 39A. So 10mm cable is ok so you don' t have to worry for 64A.


Regards

Paul
 21 December 2012 11:35 PM
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chunk522

Posts: 126
Joined: 12 December 2010

The boiler had 3 supplies when I evetually got there a 45 amp main supply and 2 immersion heater supplys one 24 hour and one off peak, the 24 hour also controlled the boiler pump via a circuit board, a nice peace of kit to be honest but another leason learnt as the plumber says its only a LNE 45 amp supply.
The building also had no off peak meter so I had to use my own timer from the main dist board.
Thanks for the replies
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