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Topic Title: can i plug a 20A electrical appliance into the wall socket
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Created On: 01 April 2013 04:17 PM
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 01 April 2013 04:17 PM
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neoth

Posts: 1
Joined: 01 April 2013

Hi all,

if I have a appliance that draws a max current of 20A, and I plug it into P4 as shown in the diagram,

will it cost any trip to my MCB or failure?

can my cable size/rating support my requirement?

and for the 13A S/S/O in ring circuit , is it fine for me to plug in a 20A appliance?



Thanks in advance.
 01 April 2013 04:47 PM
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peteTLM

Posts: 3359
Joined: 31 March 2005

No, im afraid not. A 13A socket is designed for a load of 13A, and the ring circuit is designed to supply 13A sockets.

I cant open the photo, but normally 20A appliances are supplied from their own circuit installed for that purpose.

Regards

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 01 April 2013 05:09 PM
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unshockable

Posts: 863
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http://i809.photobucket.com/al...20130327_11185904.jpg

Make of this what you will. I would like to understand but it is beyond me now.

It doesn't seem an inductive load. FWIK.

Thanks to Andy lewsbury for the technique.

Simon
 01 April 2013 05:30 PM
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rogersmith7671

Posts: 886
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Quote;
can i plug a 20A electrical appliance into the wall socket.

Yes provided the socket and final circuit are rated to cope with the expected current drawn by the appliance.

regards
 01 April 2013 05:35 PM
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peteTLM

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I see, you would be looking to treat your new 20A load in the same manner as the air con at AC9, with its own mcb.

As a guess, is this for a modular add on garden office building?

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Lack of planning on your part doesn't make it an emergency on mine....

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 02 April 2013 11:14 AM
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Legh

Posts: 3606
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It looks like a small office - with 25 socket outlets, air con unit, 13 lights, plus a large outside light.
I suppose B40A will do it but I would want to know a little more about how the demand was was being shared across all those circuits before I would add on an extra 20A.

Legh

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 02 April 2013 11:53 AM
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jcm256

Posts: 2012
Joined: 01 April 2006

No, you can't plug a 20 amp appliance into a 13amp socket, to save issuing an urgent defect notice I have cut off the plug-top on least three occasions on stm/HP washers at garages because of the nail or welding rod fitted in the plug- top fuse holder. Some HP washers could be rated at 16 amps and need backed up with a 20- amp fuse..


See 17th Edition for diagram of ring and radial circuit, you are limited by the 13amp fuse.
BS 7671:2008, Corrigendum (July 2008)

http://electrical.theiet.org/w...ions/updates/index.cfm
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