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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..

  • 0 in reply to mapj1

    Upper level LUCY box looks to have a seperate earth run from the neutral termina into the panel board so most liklely TNC-S. Not seen inside the lower LUCY box where the incoming supply cable pops in from the road but there are only 4 x TPN tails conductors leaving this box which rise to the second LUCY box on the 1st floor so bottom box must be TNC. Am guessing tails size is either 35mm or 50mm. Must have a look at size stamped on cable lugs to find out.

    Am assuming they are now shopping round for a competitive supplier/meter company or whatever. Supply is de-enrgised at bottom LUCY box with 200A fuses remaining in their packing until someone comes out to fit.

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