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2-7
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 VST225A and VST260A MINIMUM COPPER SUPPLY WIRE RECOMMENDATIONS
460 V
VST-225 through VST 260
Minimum Copper Supply Wire Recommendations
Model
Minimum Supply
Conductor
Ampacity
Minimum 75°C
Copper Wire
Sized @ 30°C
Minimum 75°C
Copper Wire
Sized @ 40°C
Minimum 75°C
Copper Wire
Sized @ 45°C
Notes
VST 225
488
250 (2)
300 (2)
350 (2)
[3]
VST 260
561
300 (2)
400 (2)
500 (2)
[3]
Notes: Wire sizes are per Table 310.15(B)(16) in the National Electrical Code (NEC)
[3]
Wires sized for 2 parallel sets of conductors in 2 conduits (1 set in each conduit).
Figure 2-3 – PACKAGE MAXIMUM CURRENT CONSUMPTION SUMMARY
The appropriate installation and use of 75ºC 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.