• Minimum circuit ampacity (MCA) is based on 125% of the rated load amps for
the largest motor plus 100% of the rated load amps for all other loads included
in the circuit, per N.E.C. Article 430-24.
• The recommended disconnect switch is based on a minimum of 115% of the
summation rated load amps of all the loads included in the circuit, per N.E.C.
440 - 12A1.
• Minimum fuse size is based on 150% of the largest motor RLA plus 100% of
the remaining RLAs (U.L. Standard 1995, Section 36.1).
Minimum fuse rating = (1.5 x largest compressor RLA) + other compressor
RLAs + (# fans x each fan motor FLA).
• Maximum dual element fuse size is based on 225% maximum plus 100% of the
rated load amps for all other loads included in the circuit, per N.E.C.440-22.
Maximum fuse rating = (2.25 x largest compressor RLA) + other compressor
RLAs + (# fans x each fan motor FLA)
• Minimum circuit breaker is 150% maximum plus 100% of rated load amps
included in the circuit, per circuit per U.L. 1995 Fig. 36.2.
Minimum circuit breaker rating = (1.5 x largest compressor RLA) + other
compressor RLAs + (# fans x each fan motor FLA)
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