An air conditioner rated at 3 phase 400V, 7.2 kW is to be installed using a 4
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An air conditioner rated at 3 phase 400V, 7.2 kW is to be installed using a 4 core-and-earth, general purpose PVC. The efficiency is 85 % and power factor of the unit is 0.88. The supply will be taken from an existing spare way in a consumer’s unit containing semi-enclosed (rewirable) fuse BS3036. The supply cable will run for much of its 24 m length in a roof space which is thermally insulated with glass fibre. The roof space ambient temperature is expected to be 45°C and, the cable will be bunched and clipped direct to a non- metallic surface with five other 2 core and earth cables.
Calculate the design current.
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