⚡ Electrics & Lighting

14 calculators

Cable sizing, circuits, consumer units, EV chargers and solar PV.

Cable size selection to BS 7671 — current capacity, voltage drop, grouping.

Socket count per room type to BS 7671 recommendations.

Circuit load, cable sizing and MCB selection for lighting.

Ways required, RCD and RCBO selection for consumer units.

7kW and 22kW cable sizing, earthing and EICR requirements.

Lux levels, duration, battery backup and spacing.

Panel count, kWp, annual yield and roof area for solar installations.

Detector count, spacing and grades to BS 5839.

Fill rates, bend allowance and fixings for conduit and trunking.

Phase balancing, cable sizing and diversity for 3-phase systems.

Earth electrode sizing and bonding conductor requirements.

Spacing-to-height ratio and uniformity for LED downlights.

Required lux levels by room type and fixture selection.

Tray width and fill capacity for cable containment.

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