Service Manual

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