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SP - single-pole, DP - double pole. What does this mean?


 
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doh.....

from United Kingdom

Joined: 12 May 2007
Posts: 6
Location: United Kingdom

PostPosted: Mon May 14, 2007 1:41 pm Reply with quote

I am about to replace some sockets and switches in my house. I have noticed that they come either SP or DP. What does this mean? Which one is better?

Please advise

Many thanks
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afswift

from United Kingdom

Joined: 31 Mar 2006
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Location: Yorkshire,
United Kingdom

PostPosted: Mon May 14, 2007 1:45 pm Reply with quote

Refers to the switching,

single pole just switches live

double pole switches both live and neutral
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davy_owen_88

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PostPosted: Mon May 14, 2007 1:45 pm Reply with quote

Single pole switches disconnect the phase conductor only, while double pole disconnects both phase and neutral.

There is not requirement that you use DP switches but I would recommend it anyway.

*bah!*
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afswift

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PostPosted: Mon May 14, 2007 1:46 pm Reply with quote

beat me to it!!
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JohnD

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PostPosted: Mon May 14, 2007 1:48 pm Reply with quote

yes, DP is preferable

However, more important still is buying a decent brand.

Crabtree, MK, MEM are all good.

Cheap ones are usually cheap for a reason.

What do you have in mind, and how many? Electrical wholesalers are often cheaper if you are buying a bunch.

Fancy brass and chrome ones are always a lot more more expensive than white.
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doh.....

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PostPosted: Mon May 14, 2007 1:59 pm Reply with quote

Was looking at Crabtree or MK. Screwfix seem reasonable. I prefer white because there cheaper but my partner would prefer brushed stainless. Let the battle commence.

Thanks for the help
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festa

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PostPosted: Mon May 14, 2007 2:44 pm Reply with quote

T.T earthing systems?
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Adam_151

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PostPosted: Mon May 14, 2007 3:28 pm Reply with quote

festa wrote:
T.T earthing systems?


I understand why you should say that, but you're wrong, removeing the plug is allowed as isolation and breaks both poles, the switch is just a functional switch (although some of the newer ones might be approved as isolators... 3mm separatation and all that)
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festa

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Location: Cheshire,
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PostPosted: Tue May 15, 2007 9:37 am Reply with quote

Hi Adam..
Yes a socket outlet can be isolated by switching off and removing the plug but when you have an FCU inline how can you disconnect the neutral then?
Just check OSG page 34 note(ii) for me and let me know im not misunderstanding it as whenever i carry out work on an installation forming part of a T.T earthing system i always replace/install double pole switchgear.
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JohnD

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PostPosted: Tue May 15, 2007 9:48 am Reply with quote

festa wrote:
.when you have an FCU inline how can you disconnect the neutral then?.


DP FCU of course

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festa

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PostPosted: Tue May 15, 2007 10:04 am Reply with quote

Hiya John..
So your saying in a T.T earthing system DP switches are to be used?
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JohnD

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PostPosted: Tue May 15, 2007 10:07 am Reply with quote

dunno.

I was just saying, if you want to use an FCU, it can be a DP one.
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