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

gullanedave

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.

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  • 0

    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

  • 0 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 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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