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Supply requirement for heaters

whjohnson

Been asked to look at provision of a new supply for  a 72KW TPN blow heater. Am getting current per phase coming in at over 100A with a cable size of 35mm 4 core. Having taken this as correct, am now looking at a 36KW option instead. Current is coming in at around 52A with a cable size of either 10mm 4 core or 16mm 4 core. I don't know anything else at the moment until I visit the site next week, but am not confident that these valuses are correct for the KW ratings.

Have assumed a pf of 1 for resistive load. Don't know how the elements are configured in the heater and am guessing the neutral is required for the fan motor and controls.

Input gratefiully recieved..

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    I urge not calculating with too much precision. If the heater is designed 220 volts, and is connected to 250 volt supply, it will draw significantly more current then calculation suggests.

    I urge the use of OCPD and cable rated for 125 amps. Also consider that the heater may be replaced with another of a similar NOMINAL rating, but slightly higher actual  loading, within the lifetime of the electrical installation.

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  • 0

    I urge not calculating with too much precision. If the heater is designed 220 volts, and is connected to 250 volt supply, it will draw significantly more current then calculation suggests.

    I urge the use of OCPD and cable rated for 125 amps. Also consider that the heater may be replaced with another of a similar NOMINAL rating, but slightly higher actual  loading, within the lifetime of the electrical installation.

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