Milnor MWF18J8, Installation Manual, Page: 16 / 35

14
Pellerin Milnor Corporation
2 Important Installation Precautions
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External Fuse/Breaker, Wiring, and Disconnect
Requirements
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An external fuse
or
circuit breaker and a disconnect switch must be provided in the facility for
(and dedicated to) the machine. These may be in the same or separate, permanently mounted
electric boxes. Electric power and ground connections will be made between the incoming power
junction box on the machine and this external box (or one of the boxes).
Fuse or Circuit Breaker Size
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Refer to the “External Fuse and Wire Sizes...” document for your machine model. This document
will be found in the machine's installation manual, available from the parts department. Choose
the fuse or circuit breaker from the appropriate column of the table provided, as follows:
If a fuse is used
— Match the fuse listed in the “Fuse” column for your machine's voltage.
The specified fuse sizes are consistent with the USA National Electric Code (NEC), section 430-
52, exception No. 2, Part B, which states: “The rating of a time-delay (dual-element) fuse shall be
permitted to be increased, but shall in no case exceed 225 percent of the full-load current.”
If a standard circuit breaker is used
— Match the amperage rating listed in the
“Breaker” column for your machine's voltage.
If an inverse time circuit breaker is used
— Match the characteristics (amperage
rating) of the fuse listed in the “Fuse” column for your machine's voltage. When applied to an in-
verse time circuit breaker, the specified fuse sizes are consistent with the USA National Electric
Code (NEC), section 430-52, exception No. 2, Part C, which states: “The rating of an inverse time
circuit breaker shall be permitted to be increased, but shall in no case exceed 400 percent for full-
load currents of 100 amperes or less.”
Wire Size
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Use wiring no smaller than that listed for your machine's voltage in the “Wire size... ”column in
the “External Fuse and Wire Sizes...” document. The table value applies to runs up to 50 feet (15
meters). Use the next larger size for runs 50 to 100 feet (15 to 30 meters). Use wire two sizes larg-
er for runs greater than 100 feet (30 meters). If an inverse time circuit breaker is used and local
codes require a larger wire size than that specified by Milnor, abide by the local code.