Re: CALCULATION OF KVA RATING OF WELDING T/F WITHOUT NAME PLATE Home › Electrical Engineering Forum › General Discussion › CALCULATION OF KVA RATING OF WELDING T/F WITHOUT NAME PLATE › Re: CALCULATION OF KVA RATING OF WELDING T/F WITHOUT NAME PLATE 2011/10/08 at 1:53 pm #12547 adminKeymaster Welding Machine commonly rated in amperes. And most of welding machine have 50V secondary winding or use a volt meter to measure it exactly. To calculate the kVA=(ampere rating x secondary voltage) / 1000.
