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GENERAL INFORMATION
120 VOLT
Ungrounded
Grounded
(Neutral)
Grounding
BLACK
WHITE
GREEN
120
0
120
240 VOLT
Ungrounded
Ungrounded
Grounding
BLACK
RED
GREEN
240 120
120
120
ABCNeutral
RED BLACK RED
120
120 208
208 208
208 3Ph
277
ABCNeutral
RED BLACK RED
277
277 480
480 480
480 3Ph/277 1 Ph
120
ABCNeutral
RED BLACK RED
120
120 240
240 240
240 3Ph
Common Service Wire Configurations
Amps = Watts (for single phase units) Example 4500W/240V = 18.75A
Volts
Amps = Watts (for balanced 3 phase units) Example 4500W/240V x 1.732 = 10.82A
Volts x 1.732
Watts = Amps x Volts Example 18.75A x 240V = 4500W
Ohms = Volts Example (240V) / 4500W = 12.8 Ohms
Watts
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2
Commonly Used Formulas
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