-----wishing everyone on this great forum a very happy christmas
and super new year.
much new stuff coming up so looking forward to lots of strong
debates.

Regards.

The same to you UKPN you never know we may meet as a client of mine is having a new supply to one of her houses. Overhead from a pole then underground. Not far from Epping?

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John Peckham

http://www.astutetechnicalservices.co.uk/

Right back at you, have a good one

UKPN
Only out of interest, what is this new standard from your company all about ? (Small extract below this post), the extract says for over 100amps you supply an MCCB, is that in place of the cut-out fuses?, Just wondering in a multi - occupancy building be it one phase go overloaded or unlikely, short to neutral or earth, surly all supplies would then go off. Is the MET now your boundary Extend PME inwards will the DNO or IDNOs still have an interest in internal earthing sizes or nothing to do with us attitude . As you are, the biggest and other networks may follow, that is why am asking New regulations (Maybe only internal to your area) questions are "Interest only", Is the MCCB fully adjustable , overload, short circuit and earth fault protection type.

The new standards will be published on the UK Power Networks websitein November 2012 and both standards will become effective for all new connection quotations from 1 January 2013. Existing quotes prior to this date will be honoured.
The new multi-occupancy buildings standard will mean that UK Power Networks will no longer install or maintain any new rising and lateral sub-main cabling networks within a building. The PME earthing will only extend as far as the service intake cut out and with provision for metering of the individual properties within the building. This will impact many new build or renovation projects of flats, office buildings, shopping centres and any multi-use buildings sharing a common intake service.
In the future the responsibility for the design, installation and maintenance of new rising and lateral sub-main cabling networks within buildings will rest with the building landlord or building owners' nominated Building Network Operator (BNO).
For new service connections above 100A there will be the introduction of Air Circuit Breakers (ACBs) across the three regions, including the introduction of metering CTs within the service cut out equipment rather than a separate chamber. UK Power Networks will provide clear information on the requirements of the intake location or switch room size.

Same to you
Prosperous and accident free new year.
Regards
jcm

Impartial view for professional intrest, I do not represent UKPN.....

The ACB services will be for large services fed from subs, along the lines of what is offered on the London Network of UKPN. The ACB will be in a sub, it will not replace a cut out for smaller services.

Simon

Another dull day always overcast or raining. Yes thanks for that reply, that post was from information on an ECA circular.
Only asking because nowadays the main breaker at the switchboard over 100amps is usually a ACB,
Therefore would duplication be necessary. I think it best leave this inquiry for clarification at rest.
Thanks
jcm


http://www.eca.co.uk/training-...ections-above-100amps/

Happy new year UKPN.

All the best

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Lack of planning on your part doesn't make it an emergency on mine....

Every man has to know his limitations- Dirty Harry

Here is the standard, it is in the public domain:

http://library.ukpowernetworks...upplies+Above+100A.pdf

Thanks for that, I see the picture now with this extract:

The customer's electrical LV cable design for connection to the UK Power Networks ACB shall include the following criteria:
. Compliance with the current edition of BS7671.
. That an LV fault at any point up to the customer's first circuit breaker or fuse will trip the UK Power Networks owned Air Circuit Breaker within five seconds.

(My own thoughts, could be to comply with Short-circuit protection of conductors in parallel Fig 10E- Linked protective devices page 420) However, there again they do not need to comply with BS7671, but the customer does so wither relevant or not do not know. They are invisible anyhow, so I will stop posting, but thanks for reply and information.

http://www.peppercorp.com/CaseStudy.aspx?t=UKPN