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EXAMPLE: Supply voltage is 240-3-60.
AB = 243 v
BC = 236 v
AC = 238 v
Average Voltage =
243 + 236 + 238
3
= 239 v
Determine maximum deviation from average voltage:
(AB) 243 – 239 = 4 v
(BC) 239 – 236 = 3 v
(AC) 239 – 238 = 1 v
Maximum deviation is 4 v.
Determine percent voltage imbalance:
% Voltage Imbalance = 100 x
4
239
=1.7%
This amount of phase imbalance is satisfactory as it is below
the maximum allowable 2%.
Table 3 — Electrical Data — 30MPA,MPW Units
LEGEND
*Supply Range — Units are suitable for use on electrical systems
where voltage supplied to the unit terminals is not below or above
the listed range limits.
NOTES:
1. All units have one field power terminal block.
2. Maximum incoming wire size is as follows:
For units with terminal block:
350 kcmil for unit sizes 030-045; 208/230-3-60 voltages.
2/0 for all other unit sizes; all voltages.
For units with optional non-fused disconnect:
350 kcmil for unit sizes:
030-045; 208/230-3-60 voltages.
045; 380-3-60 voltage.
3/0 for unit sizes:
015,020; 208/230-3-60 voltages.
020-040; 380-3-60 voltage.
030-045; 460-3-60 and 575-3-60 voltages.
2 AWG for unit sizes:
015; 380-3-60 voltage.
015-020; 460-3-60 and 575-3-60 voltages.
3. Additional control circuit power is not required.
4. Any field modification of factory wiring must be in compliance
with all applicable codes. Field-installed power wires must be
rated 75 C minimum.
5. Use copper conductors only.
6. Control circuit power supply is 24-v single phase. Control
power is supplied by the factory-installed control transformer.
IMPORTANT: If the supply voltage phase imbalance
is more than 2%, contact your local utility company
immediately.
UNIT SIZE
30MPA,MPW
VOLTS
NAMEPLATE
(3 ph, 60 Hz)
VOLTAGE* COMPRESSOR UNIT
Quantity
LRA
(ea.)
MCA ICF MOCP
Rec
Fuse
Min Max
015
208/230 187253
2
195 66.4 224.5 90 80
380 342 418 123 37.6 139.7 50 45
460 414 508 95 33.1 109.7 45 40
575 518 632 80 27.5 92.2 35 35
020
208/230 187253
2
239 80.6 274.8 110 90
380 342 418 145 53.4 168.7 70 60
460 414 508 125 40.3 142.9 50 45
575 518 632 80 32.2 94.3 45 40
030
208/230 187253
2
340 125.6 395.8 175 150
380 342 418 196 76.5 230.0 110 90
460 414 508 179 60.5 205.9 8070
575 518 632 132 53.3 155.7 70 60
040
208/230 187253
3
300 166.7 402.6 200 200
380 342 418 139 87.4 192.
8 110 100
460 414 508 150 75.1 196.2 90 90
575 518 632 109 64.7 148.88070
045
208/230 187253
3
340 181.4 451.6 225 200
380 342 418 196 110.5 264.0 125 125
460 414 508 179 87.4 232.8 110 100
575 518 632 132 77.0 179.4 100 90
ICF — Maximum instantaneous current flow during starting.
kcmil — Thousand circular mils
LRA — Locked rotor amps.
MCA — Minimum circuit amps (for wire sizing). Complies with
NEC, Section 430-24.
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code (U.S.A.)
Rec
Fuse
— Recommended dual element fuse amps (150% of com-
pressor RLA). Size up to the next standard fuse size.