Demand Factor (used to be in The Electricians Guide by John Whitfield)

Hello,

Handy old book I have, The Electricians Guide (5th Edition) by John Whitfield, lists out typical Demand Factors grouped by building or area type.

e.g. 40% for office or school, 70% for restaurants, 60% for a bank, etc.

Is there any other document that lists these factors?

I am doing some very high level preliminary space calcs for a client, based on BG_86 2024 W/m2 rates, but want to apply a diversity factor that has a solid/respected reference and not just my feel for it.

Normally I would have went with referencing The Electricians Guide mentioned above, but it appears to be discontinued, so I am wary of citing it.

Thanks.

0 Mike Mln 3 hours ago

Unless I have misunderstood.

The closest thing would be Appendix A of the onsite guide.

"Maximum demand and diversity"

The locations are a bit more restrictive, and the diversity is split into circuit types.

Hopefully it is the type of thing you are looking for.

Mike
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0 gullanedave 3 hours ago in reply to Mike Mln

Hi Mike,

Yeah its more high level building area type diversity/demand factor info I am looking for.

I know the OSG lists out the diversity allowed per circuit type, but I am looking for more holistic values that can be applied way before you are the stage where you know how many lighting or heating circuits you have, and what their respective max demand is.

See image below as example from The Electricians Guide I was talking about in original post.
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0 mapj1 1 hour ago in reply to gullanedave

you may not have seen that the DNOs have 'After Diversity Max demand' figures they use for planning how many transformers per shopping mall or housing estate, now that is probably too course for what you need, but is worth realising that a house with a 100A fuse is only worth a couple of kW, so long as there are enough of them on the same substation that the load peaks smooth out...

Examples.

https://www.spenergynetworks.co.uk/pages/admd_calculator.aspx

network planning.

https://www.nationalgrid.co.uk/downloads/3127

https://www.spenergynetworks.co.uk/userfiles/file/ESDD-02-012.pdf

Mike
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Demand Factor (used to be in The Electricians Guide by John Whitfield)

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