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Topic Title: 2 ring mains in one room
Topic Summary: is it OK?
Created On: 03 May 2013 12:19 PM
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 03 May 2013 12:19 PM
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burke3

Posts: 24
Joined: 12 January 2006

Hello Gents,

we are manufacturing & installing a large all-steel enclosure (approx 6m x 8m x 3m(H)). It will be installed in a factory floor space. The enclosure is divided into 2 rooms. There is a request for 12 double sockets per room, to be supplied by 2 ring mains, that is each room to have 2 ring mains. I am locating an industrial DB unit on the side of the enclosure & a 3PN+E 63A supply will be run to the DB. For each room, it is my intention to run each ring main from the same phase (eg.. room #1 all from Black phase, room #2 all from Brown phase). The reason I am using 3 phase is because the client cannot say what the max socket loads will be, so I can dedicate the normal maximum 32A (or so) per ring-main, and leave one phase free for the auxiliary equipment load of 25amps that will be required besides the sockets.

The question is...

An NICEIC certificate will be produced against BS7671 to certifiy the enclosure, but is there any rule that would preclude the install of 2 ring mains in one room.


sorry about any unecessary detail, thanks for your comments.
 03 May 2013 12:23 PM
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AJJewsbury

Posts: 11547
Joined: 13 August 2003

Nope - you can have as many rings as you want. The only requirement is to be able to identify which sockets are fed from which protective device.

You can even have them on different phases if you want - the requirement not to have a difference of more than 250V in a room went long long ago and even the requirement to label (415V between enclosures) disappeared several versions of the regs ago.

- Andy.
 03 May 2013 12:33 PM
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burke3

Posts: 24
Joined: 12 January 2006

Thanks Andy.!!
 03 May 2013 03:44 PM
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DOUGIE1000

Posts: 4168
Joined: 13 August 2005

a good example of this is we wired a commercial kitchen few weeks past, ring main for each side of the kitchen counters. single phase provided.

D

-------------------------
Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 03 May 2013 05:50 PM
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alanblaby

Posts: 389
Joined: 09 March 2012

Terminology please Gents.
Ring final circuit.
 07 May 2013 05:00 PM
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Martynduerden

Posts: 3211
Joined: 13 July 2008

Originally posted by: alanblaby

Terminology please Gents.

Ring final circuit.


Don't you like the look of the RMU's next to the sofa Alan?

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Regards

Martyn.

Only a mediocre person is always at their best



www.electrical contractors uk.com
 07 May 2013 09:15 PM
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ebee

Posts: 5727
Joined: 02 December 2004

Ring finals (or radials) you can have as many as you want in any area/location .

Just make sure any labelling/schedule makes it all clear

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Regards,
Ebee (M I S P N)

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