Discuss 100A DP Isolator Installation Between Meter and CU in the UK Electrical Forum area at ElectriciansForums.net
D MCBs would normally only used with Direct on Line electric motors.Hi guys,
When installing a new CU does anyone ever install a 100A double pole isolator switch between the meter and the consumer unit?
Very often I come across 16mm tails which need to be upgraded to 25mm so I join the old tails to new in a Henley block and get the DNO to come and upgrade their side at their convenience.
Instead of using a henley block could I use an isolator instead?
In anyones opinion would there be any disadvantages to this?
I wouldhave thought having an isolator would be very handy but the meter guys hardly ever bother putting one in, even now.
They're also relatively inexpensive. Another thing, I cannot seem to finda 2-module metal enclosure so would this would be okay in a plastic enclosure? That to me seems like a bit of grey area.
Any help appreciated. Thanks
Similar switchgear assemblies
The phrase ‘similar switchgear assemblies’ in Regulation 421.1.201 means those assemblies used for the same fundamental application as a consumer unit. A consumer unit is defined in Part 2 of BS 7671:
‘Consumer unit (may also be known as a consumer control unit or electricity control unit). A particular type of distribution board comprising a type-tested co-ordinated assembly for the control and distribution of electrical energy, principally in domestic premises, incorporating manual means of double-pole isolation on the incoming circuit(s) and an assembly of one or more fuses, circuit-breakers, residual current operated devices or signalling and other devices proven during the type-test of the assembly as suitable for such use.’
Consumer units - IET Electrical - http://electrical.------.org/wiring-matters/55/consumer-units/index.cfm
As long as you can find one that complies with BS EN 61439-3, you’ll be fine.You'll notice the Wylex Switched fuse's do comply, that's because they incorporate a fuse.
That's how I'm reading it?
My meter is finger tip to cleavage.I'm shocked. I'm always very careful measuring the run of the tails. Fingertip to opposite --- (1metre).
My meter is finger tip to cleavage.
I'm on a diet. Lost 10 pounds since Xmas. Hopefully I won't have a cleavage soon.You have a cleavage Pete??
Any local spark can do this.Has any got a recommendation for a company in S. Wales that fits 100A DP Isolator Installation Between Meter and CU or is only the DNO that do?
Only if they are graced with seal fairies. ?Any local spark can do this.
It depends on the DNO's policy really.Has any got a recommendation for a company in S. Wales that fits 100A DP Isolator Installation Between Meter and CU or is only the DNO that do?
Local sparks can't isolate the DNO fuseAny local spark can do this.
This is why I've asked, if I get a local sparky who hasn't permission to remove the DNO fuse it could end up a bit nasty.It depends on the DNO's policy really.
Strictly speaking the sealed equipment is owned by the DNO or the billing company so only they should make changes there, but many DNO are OK with registered electricians doing it and some even provide temporary seals, etc.
What the DNO is really concerned with is folk trying to bypass meters to seal the supply, and the danger of pulling the main fuse to isolate if there is anything dodgy about the cut-out condition as shorting the incoming supply is going to end your day very badly. This is the sort of example to show the danger of working on a live supply:
They had proper PPE and probably were OK, their underpants probably less so.
So ask local electricians about it, they ought to know if the DNO is agreeable and/or if they already have permission to do that.
This has been over complicated for you, albeit all the comments after mine are all correct.This is why I've asked, if I get a local sparky who hasn't permission to remove the DNO fuse it could end up a bit nasty.
Depends on the DNO. The DNO here (SSE) permit registered electricians to do this, with a load of provisos.Local sparks can't isolate the DNO fuse
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