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" if two phases are used then it would become 240v " You are correct to this extent.
".......and if 3 phases are used it would be 360v. " You are wrong about this. You are drawing your power from TWO points only as a single phase, either between any phase and a neutral (120V), or between TWO different phases (240V) .
".......and if 3 phases are used it would be 360v. " You are wrong about this. You are drawing your power from TWO points only as a single phase, either between any phase and a neutral (120V), or between TWO different phases (240V) .
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The 4 wires of the transformer(s) secondary, if configured in a wye configuration (4 wires), is actually a 208Y / 120v system.
This means the voltage from each phase to the neutral is 120 volts. The voltage between two phase wires is 208 volts. You can calculate the voltage using trigonometry. If you need help calculating the phase to phase voltage, e mail me.
You need to know the transformer rating to determine the amps available for each phase. Normally the use of a 208 y / 120 v system is for homes or businesses requiring a larger system than is normally furnished with a 120 /240 V split-phase system. As such, the norm for these systems is an unbalanced load in each phase. This is the result of the 120 volts being used for lights, which usually are not balanced in loads.
The downside of this system is there are fewer appliances available for 208 volts. And resistance heaters (stove element and electric dryer elements) operate at a substantial reduction in watts, therefore heat.
Any 3-phase device must be rated for 208 volts.
TexMav
This means the voltage from each phase to the neutral is 120 volts. The voltage between two phase wires is 208 volts. You can calculate the voltage using trigonometry. If you need help calculating the phase to phase voltage, e mail me.
You need to know the transformer rating to determine the amps available for each phase. Normally the use of a 208 y / 120 v system is for homes or businesses requiring a larger system than is normally furnished with a 120 /240 V split-phase system. As such, the norm for these systems is an unbalanced load in each phase. This is the result of the 120 volts being used for lights, which usually are not balanced in loads.
The downside of this system is there are fewer appliances available for 208 volts. And resistance heaters (stove element and electric dryer elements) operate at a substantial reduction in watts, therefore heat.
Any 3-phase device must be rated for 208 volts.
TexMav