Diversity
The design allowance for the fact that connected loads never all run flat-out at once. A kitchen's sockets, oven and kettle sum to a huge figure on paper, but the realistic simultaneous demand is far lower. Applying diversity turns the connected load into a sensible , keeping supplies, switchgear and cables from being absurdly oversized.
Where Diversity fits in the learning path
The Installation section covers these units:
- Wiring Systems & Enclosures
- Cable Selection & Circuit Design
- Earthing, Bonding & Consumer Units
Curriculum mapping: C&G 2365 Units 203/204/305.
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- Cable SizingInstallation
2. Try recalling, then explore practice
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- Cable Selection — quiz previewPlus · Installation
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The realistic peak current an installation will draw, worked out from the connected load with diversity applied. It is the figure the supply arrangements are sized against — tails, main switch, distribution equipment — and the first number a designer needs before any circuit-level decisions make sense.
Maximum demand
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Maximum demand
The realistic peak current an installation will draw, worked out from the connected load with diversity applied. It is the figure the supply arrangements are sized against — tails, main switch, distribution equipment — and the first number a designer needs before any circuit-level decisions make sense.
Read the Maximum demand entryCurrent-carrying capacity — Iz
The current a cable can carry continuously in its installed conditions without its insulation exceeding the temperature it was designed for. Tabulated values assume reference conditions; the real, installed capacity is what remains after correction factors for temperature, grouping and insulation have taken their share.
Read the Current-carrying capacity entryA definition is a start. Using it in a real question is where it sticks.