The capacity of single spot welder is 160KVA, which is six units. How much cable should be selected for main circuit?
Enough, because the spot welder is working instantaneously,
KVA is the power unit of capacity is the apparent power, apparent power is equal to the square = active power (KW) of the square + reactive power (KVar) of the square. You said KW is equal to KVA* active power and power factor. The general power factor at about 0.9.160*0.9=144KW*6 =864KW3 x 240 - + 1 * 120 - Cable safe carrying capacity is 448A, rated cable 900KW 1800A, so the total power 900KW minimum for 4 3 x 240 - + 1 * 120 - Cable
Single phase, 380 volt power supply, 160KVA, according to the temporary load rate of 40% (the actual temporary load rate is generally not higher than 25%), the average current strength of single Taiwan is:(160000/380) *0.4=168 ANNSix triangle connection, the average line current is 336,Select 4*150 cable, current density of 336/150=2.24, safe.3*100's copper core cable is enough, too.
