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Paragraph 2 Electric motors

Original text. Later amendments are not shown.

(1)

The difference between the output mechanical power and the input electrical power due to losses occurring in the motor must be determined using the following methods, based on a 25 °C reference ambient temperature—

(a)

in the case of single-phase motors, by direct measurement of input minus output;

(b)

in the case of three-phase motors, by measuring the losses through the “summation of losses” test procedure set out in British Standard BS EN 60034.

(2)

For the eight operating points referred to in paragraph 8(3)(a) of Schedule 16, the losses must be determined by either direct input-output measurement or by calculation.