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My experience regarding the length of the ‘tails’ with the DNO is basically “we don’t care”
I'm shocked. I'm always very careful measuring the run of the tails. Fingertip to opposite --- (1metre).
Discuss 100A DP Isolator Installation Between Meter and CU in the UK Electrical Forum area at ElectriciansForums.net
My experience regarding the length of the ‘tails’ with the DNO is basically “we don’t care”
Murdoch, does it not specify in BS7671 that all supplies must now be 25mm regardless?
May have to re-calibrate for "Moob-droop" !.......careful measuring the run of the tails. Fingertip to opposite --- (1metre).
Domestic consumer unit Main switches are rated upto a maximum rating of 100amp , does not mean you have to be using 100amp as your maximum demand.Working for dno, meter tails governed by rating of cu, NOT supply fuse. 100amp cu=25mm tails.
Domestic consumer unit main switches are rated upto a maximum rating of 100amp , does not mean you have to be using 100amp as your maximum demand.Working for dno, meter tails governed by rating of cu, NOT supply fuse. 100amp cu=25mm tails.
Should point out, that the previous post only applies if you believe DP 100A isolators and switchfuses are similar to CUs.
If you don’t believe they are similar, then you can still install them and they can be plastic, metal or whatever.
Working for dno, meter tails governed by rating of cu, NOT supply fuse. 100amp cu=25mm tails.
an isolator does not have auxiliary switching equipment, so is not "similar switchgear".421.1.201 refers to consumer units and similar switchgear. In BS7671 Switchgear is defined as 'an assembly of main & auxiliary switching equipment for operation, regulation, protection or other control of an electrical installation'. That's sounds like an isolator to me?
an isolator does not have auxiliary switching equipment, so is not "similar switchgear".
101 posts - congratulations MM!just getting my post count up
101 posts - congratulations MM!
(Just getting my post count up!)
I needed tom upgrade my DNO fuse to 100A so needed to increase my tails to 25mm.
Contacted DNO and they agreed to replace tails and increase fuse to 100A
I ordered a 100A isolator (in a plastic enclosure)
When the DNO arrived I asked if they would fit supplied isolator. They were happy to and even added their seals to it. I asked about it needing to be a metal enclosure and they said it was part of their installation so outside the requirement.
It’s not a question of whether it’s metal or plastic, the Regulation allows for either.
It can be metal, or it can be plastic inside a metal box.
The question is whether the item (whether it’s a CU or similar) meets the standard of BS EN 61439-3.
Reply to 100A DP Isolator Installation Between Meter and CU in the UK Electrical Forum area at ElectriciansForums.net
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