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(work in progress)

Diversity in this context is all about how one establishes the maximum demand for an electrical installation or an electrical circuit. The guidelines shown here are some of those as presented in the On Site Guide. Note however that these are just that - guidelines. They are based on statistical probabilities and typical usage. As a circuit or installation designer you may choose to make less flexible assessments of current demand based on your knowledge of the actual installation.

Note also that the figures presented here are for domestic properties only.

Allowances for Diversity

Table 4B1

Purpose of circuit Diversity applicable (domestic) Notes
Lighting 66% of total current
Heating and Power 100% of total demand up to 10A, + 50% of the remainder. Where space heating is connected to a general purpose power circuit.
Cooking appliances 100% of total demand up to 10A, + 30% of the remainder. Add a further 5A if a socket is fitted to the cooker point.
Water heaters (instant) 100% of first appliance, 100% of second, and 25% of any remaining appliances.
Water heaters (storage) No diversity allowable
Under floor heating No diversity allowable
Storage Heaters No diversity allowable
Standard Circuits 100% of current demand of largest circuit. + 40% of demand for every other circuit.

Allowances at point of use

See Also