Three Phase Electrical Wiring Installation In Home Nec Iec The motor will run fine. its going to see the 240 phase to phase. the voltage you are seeing on the high leg should be closer to 208 (120 x 1.73) than 240. the industry standard for metering 4 wire services call for the high leg to go on the right, or "c" phase while the code calls for the high leg to go on "b" phase on customers equipment. High leg delta wiring 240v, 208v & 120v, 1 & 3 phase.
High Leg Delta Wiring 240v 208v 120v 1 3 Phase Panel The wiring diagram for a 3 phase motor shows how the motor’s three windings are connected to the power supply and control circuits. each winding corresponds to one phase of the electrical system, and the proper phasing and sequencing of these windings is crucial for the motor’s operation. the wiring diagram typically includes information. Aug 16, 2018. #1. i have a guy on a job 3phase 240 120v high leg. they are burning up 3 phase motors. here are the readings on the incoming lines, before the main. these have also been checked with a load (compressor, no difference) a to ground 122v b to ground 121v c to ground 206v (little low) a to b 243v a to c 242v b to c 230v. Jan 22, 2011. messages. 8,031. mar 23, 2014. #2. 3 phase machines with low voltage controls require that you identify the high leg and make sure it is not feeding the control transformer. connect either of the low legs to the transformer, and note the tap. some are tapped for 208, 277, 120, etc. Take a closer look this is a delta not a y. same thing as a 120 240 3 phase 4 wire service except double the voltage. instead of a high leg of 208 volt you have a high leg of 416 volt. used to be very common in some areas for things like oil wells, irrigation pumps, etc.
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