Fast Calc is an easy-to-use, comprehensive electrical calculator created specifically for Mac. It includes a prospective current calculator, lux level calculator to calculate the amount of luminaires needed for a room/lux level, BTU to watts converter, 3 phase volt drop calculator, kW to amps calculator, resistance Ω calculator, kW to HP converter, solar energy output estimator, and a cable calculator that calculates the minimum cable size required, volt drop, percentage drop and load for cables up to 400mm SWA.
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