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Maximum demand, and a use for the On-Site GuideWhich book does maximum demand simply?
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Maximum demand — what it actually is
How much current the installation will really draw, as opposed to the sum of everything that could theoretically be switched on at once.
It matters for two reasons: it decides the size of the supply, and — on a periodic — it is how you check that years of added circuits have not quietly overloaded the DNO's fuse.
At last, a use for the On-Site Guide
They are not in BS 7671 and not in Guidance Note 3. These are working tables for when you are installing, and the On-Site Guide is the site book.
| Table | Does |
|---|---|
| Table A1 | Assumed current demand — what a point is taken to draw |
| Table A2 · pp.151–152 | Diversity — the allowance applied to get maximum demand |
| Appendix H | Standard final circuits — the arrangements Table A2 item 9 refers to |
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