Sir, i want to calculate the total load in current (ampere) for the following voltages supply. In our place we have two different types of voltage supply namely: 1) is the 3 phase 380v which has a line to neutral or ground voltage of 220v and a phase to phase voltages of 380v. and 2) is the 3 phase 220v which has a line to neutral of 110v and phase to phase of 220v. They told me that the formula of getting the total current in amp is I= total watts x power factor divided by square root of 3 x 220v.. my question is where did 220v came from.. and how do you apply this formula to what i said 3 phase 380v and 3 phase 220v power supply 60hz. please advise me with the correct formula or are there any formula in computing total current to get the main amp. (i.e main breaker supply of a load)

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