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On the basis the board is only mounted an inch or so from the wall the IP is irrelevant ...
So its inaccessible ................ not ideal
I still don't think thats acceptable unless you make it big enough to be able to use spanners to check the tightness of the SWA gland
I would have run the SWA up to the bottom of the CU and glanded it directly to it - less parts, accessible .
I didn't question the rear entry, just the large size of it and the combustible material it's sat on. Potential fire containment is surely a consideration when choosing installation methods regardless of whether it's acceptable in BS7671?
There is no issue with creating an entry as you describe. Although I do think it could be done a bit better than the way it has been done in the photo.
This is a secondary board. This is a private meter just for this building. Mains supply branches off to 5 buildings, each with a private meter so the landlord can meter each building separately
I did suggest that kit to the customer before I started. He said he wanted to use the meter he already had.
What does CCC stand for, I do not know what the abbreviations you lot use. Is it Cable Capacity Chart?
All the circuits from the board i installed will be RCBO protected
Discuss Rear entry three phase board in the Commercial Electrical Advice area at ElectriciansForums.net
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Yes I don't see why not. Those red, yellow, blue and black conductors at the meter don't appear to be suitably enclosed.
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They are still not enclosed behind the meter.
O
Octopus
On the basis the board is only mounted an inch or so from the wall the IP is irrelevant ...
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I am not sure wood boarding provides suitable containment in accordance with BS7671.
Will either use expanding fire proof foam foam or intumescent lining
The SWA is terminated to a metal box just behind the wooden board and the armour is earthed
It does there are many threads confirming that
O
Octopus
So its inaccessible ................ not ideal
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Why did the rear entry hole have to be butchered so big and would it not made sense to consider a fire rated material as a backing board/entry grommet such as Paxolin?
I can cut a hole in the wood boad maybe. Thank you I will make it accessible
There is no issue with the wooden board and there is no issue with a rear entry tho. It all conforms to BS7671
There is noting to bond in this building. No gas and plastic water pipes.
There will be no exposed cable what so ever
O
Octopus
I still don't think thats acceptable unless you make it big enough to be able to use spanners to check the tightness of the SWA gland
I would have run the SWA up to the bottom of the CU and glanded it directly to it - less parts, accessible .
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That is not the issue, you have single insulated conductors exposed to a combustible surface.
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Rear entry, no problem, done it many times, also side entry. The top and bottom gland plates run out of room very fast . Does the building not have any steelwork to bond ?
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I didn't question the rear entry, just the large size of it and the combustible material it's sat on. Potential fire containment is surely a consideration when choosing installation methods regardless of whether it's acceptable in BS7671?
N
Nigel
There is no issue with creating an entry as you describe. Although I do think it could be done a bit better than the way it has been done in the photo.
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To be constructive, a much better solution would be to
A) use the 3phase meter kit that Wylex make for this board that fits neatly inside utilizing the front bottom left knockout for the screen.
B) gland that armoured straight into the bottom.
C) If you wish cables to enter the rear a id drill a few 50mm holes rather than 1 huge one as sealing up is going to be untidy, you dont want a mouse in there!, i recently fitted one of these boards and went for rear entry for the swa incomer, but i could walk down an access behind the board so glanded in the rear properly
A) use the 3phase meter kit that Wylex make for this board that fits neatly inside utilizing the front bottom left knockout for the screen.
B) gland that armoured straight into the bottom.
C) If you wish cables to enter the rear a id drill a few 50mm holes rather than 1 huge one as sealing up is going to be untidy, you dont want a mouse in there!, i recently fitted one of these boards and went for rear entry for the swa incomer, but i could walk down an access behind the board so glanded in the rear properly
D
Deleted member 26818
I wouldn’t really worry about the back board being flammable, it’s probably less so than the plastic DB.
Not sure what the small CSA conductors are for?
Not sure what the small CSA conductors are for?
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Is it a plastic DB or metal one?
A
Adam W
I would have brought the cables into a bit of 100x100 trunking below the DB, removed the plate at the bottom of the board and taken the cables up through a slot in the top of the trunking protected by a bit of paxolin or even rubber edging, maybe even grommet strip 
I'd have glanded the SWA into the bottom of the trunking.
I'd have glanded the SWA into the bottom of the trunking.
T
Toneyz
Why could the meter not be at the supply end?
This is a secondary board. This is a private meter just for this building. Mains supply branches off to 5 buildings, each with a private meter so the landlord can meter each building separately
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https://www.NoLinkingToThis/p/wylex...gclsrc=aw.ds&dclid=CKO3xb2Cjt0CFWwW0wodkFMJIw
Buy that.... Gland your swa in the top of the board properly, jobs a gooden...
Have you factored in the ccc for those tails in the trunking?
Buy that.... Gland your swa in the top of the board properly, jobs a gooden...
Have you factored in the ccc for those tails in the trunking?
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I did suggest that kit to the customer before I started. He said he wanted to use the meter he already had.
What does CCC stand for, I do not know what the abbreviations you lot use. Is it Cable Capacity Chart?
T
Toneyz
What is at the supply end?
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Should have taken a step back and thought what is the best way to do this.
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T
Toneyz
Usually, you would have an MCCB board with meters in the outgoing all in the landlord's cupboard.
I didn't design that installation. Thank you for the heads up tho
T
Toneyz
Are all the outgoing circuit RCBO protected?
All the circuits from the board i installed will be RCBO protected
T
Toneyz
Are all the outgoing circuit RCBO protected?
I would of done as Adam posted with the incoming SWA if you have to have that meter at that position would have been a trunking down the RHS SWA made off at top end cap then T off like you have done for the meter.
An MCCB is not needed as the design current is not greater than 63A per phase.
You would have made off the SWA to the end cap of the trunking?
T
Toneyz
If there is a fault on one of the final circuits you would want the MCB to trip faster than the MCCB. A practical example of this I recall was one of the final circuits we installed the chippy put a nail through the cable now as we had a low ELI it took out the RCBO as well as the existing 50A MCB protecting this D.B. bad discrimination ( sorry selectivity new word)
Reply to Rear entry three phase board in the Commercial Electrical Advice area at ElectriciansForums.net
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