Figure 2-3 - Package Maximum Current Consumption Summary - Gardner Denver VST110 Operating And Service Manual

Gardner Denver Guidelines for proper wiring, grounding and feed power conditioning - This
compressor package is provided with variable speed drives (VFD's) to control compressors and cooling
fan motors. The indicated Gardner Denver guidelines for proper wiring, grounding, and feed power
conditioning must be followed in order to protect the VFD electronics. Failure to do so will void your
warranty.
Electrical Wire Sizing – A certified electrician familiar with National Electric Codes and applicable local
codes shall size the electrical power wires serving the compressor package. Refer to Figure 2-3, for a
summary of maximum package current consumption values.
460 VOLT VST110A VST150A and VST180A MINIMUM COPPER SUPPLY WIRE
Package
Model Input Amps
Voltage (Estimated)
VST 110 460 239.23
VST 150 460 325.23
VST 180 460 365.23
The NEC requires that wire sizes be determined by using the appropriate multiplier for the conductor temperature rating at
ambient temperatures other than 30ºC and then selecting the wire that has sufficient ampacity, after correction, to meet the
load requirements shown in the "NEC Package Amps @ 30ºC" column above. Wire ampacity is to be corrected, not "Package
Amps". Additional correction multipliers apply based on more than three conductors in one conduit. The appropriate
installation and use of 75ºC and 90ºC wire is the responsibility of the electrical professional(s) performing the installation and
must be per NEC, local and state regulations as allowed. All of the above recommended minimum wire sizes are based on all
terminal connections being rated at 75ºC minimum temperature rating and copper wire run lengths of 100 feet or less. Please
note that all UL-508A listed control panels are rated for 40ºC ambient conditions.
Figure 2-3 – PACKAGE MAXIMUM CURRENT CONSUMPTION SUMMARY
RECOMMENDATIONS
Minimum
75ºC wire
NEC Package Copper Wire
Amps at
30ºC Sized at 40ºC
297.33 500 or 4/0 (2)
404.83 350 (2)
454.83 400 (2)
13-17-605
Minimum
90ºC wire
Copper Wire
Sized at 40ºC
Single set of 500kcm or two parallel sets of
350 or 3/0 (2)
4/0AWG conductors in a single conduit.
Two parallel sets of conductors in single
250 (2)
conduit.
Two parallel sets of conductors in single
300 (2)
conduit.
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NOTES