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ELECTRICAL DATA
WIRING DIAGRAMS
L1
e
L2
L1
120V, 240V
480V AC OR
DC SINGLE PHASE
L2
120V, 240V AC
OR DC SINGLE
PHASE
i
r
I
E
ACB
One or more heaters in parallel, single phase.
ACB
i
4
2 3
1L
SINGLE POLE 3 HEAT
SWITCH
Single phase, single pole, three heat switch.
e
r
I
240V OR
480V AC
THREE PHASE
L1
L1
120V, 240V
AC OR DC
SINGLE
PHASE
L2
190 Detroit Street • Cary, Illinois 60013 • Phone: 847-639-5600 • Fax: 847-639-2199 • Web: www.durexindustries.com • TOLL FREE: 800-762-3468
L2
L3
I = I
r e = E
1.73I
r
r
e = E
ACB
r e = E
WYE OR STAR CONNECTION DELTA CONNECTION 3-PHASE OPEN DELTA 2-PHASE 4 WIRE 2-PHASE 3 WIRE
The energy put out by a heating unit is measured in watts.
The power factor is always unity.
Single phase, W = I²R = EI
Three Phase Delta, W = 3EI = 1.73 EI
Three Phase Wye, W = 3EI = 1.73 EI
Two Phase 4 Wire, W = 2I²R = 2 EI
Two Phase 3 Wire, W = 2I²R = 2 EI
(Voltage between outside wires = 1.41e)
W
Amps = I = =
E
E
R
ACB
e = E
I I
I = I
1 Phase Amps = I =
W
E x PF
W
A.C., 3 Phase Amps = I =
1.73 E x PF
Three phase Delta.
DOUBLE POLE 3 HEAT SWITCH
4
L2
3
L1 5
Single phase, double pole, three heat switch.
r
r
I = I
E = 1.41e
I = 1.41
A.C., 2 Phase 3 Wire: Middle Wire Amps = Amps in outside
Wires x 1.41
W = Power, Watts
E = E.M.F. Volts
I = Current, Amperes
R = Resistance, Ohms
PF = Power Factor
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