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2014 Edition, 2014

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Safety Standards for Construction and Guide for Selection, Installation, and Operation of Adjustable-Speed Drive Systems

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Description / Abstract:

These standards apply to all industrial equipment electrical components and wiring which are parts of the electrical drive system, commencing at the point of connection of input power to these components. They apply to open or enclosed electrical equipment for use on circuits which operate from an alternating-current supply voltage of 600 volts or less.

These standards are intended for industrial equipment which will be installed in accordance with the National Electrical Code® and the manufacturer’s instructions. They are not considered adequate for industrial equipment intended for use in locations which are designated as hazardous in the National Electrical Code®.

These standards are generally applicable, but there may be situations where a conflict with other safety measures or operational requirements will necessitate that these standards be modified.

Excluded from this publication are:

a. Portions, subassemblies, or parts of motors or controllers to be used in the manufacture of more complete controllers or drive systems

b. Main propulsion equipment for railroad and transit locomotive cars

c. Automotive equipment

d. Equipment for airborne or aerospace craft

e. Equipment for household use

f. Equipment built to military specifications which conflict with or override the provisions of this publication

g. Additional specific features required for use under unusual service conditions, in locations involving hazardous atmospheres and hazardous projects

h. Systems for processes using electricity for purposes other than supplying and controlling electric motors

i. Drive systems rated less than 1/4 horsepower

j. Drive systems for portable tools

k. Industrial electric trucks

l. Passenger elevators or moveable walkways or lifts

m. Marine equipment
ANSI/NEMA MW 1000, 2014