UL 1004-9

Please note: All interim revisions for this edition available at time of your purchase will be included.

UL 1004-9 is intended to be read together with the Standard for Rotating Electrical Machines - General Requirements, UL 1004-1. For machines covered by UL 1004-9, only the following Sections of UL 1004-1 are applicable: Components; Mechanical Assembly; Frame and Enclosure; Grounding; Grounding Identification; Protection Against Corrosion; Factory Wiring Terminals and Leads; Spacings (when rated 1,000 V or less); and Current-Carrying Parts. For these Sections, the requirements of UL 1004-1 apply unless modified by this Standard.

For the purposes of this Standard, the term "machine" is representative of and equivalent to the terms rotating electrical machine and rotating machine, and is understood to mean all manner of electric motors and generators covered by the scope of this Standard. The term "machine" is understood to apply to both AC and DC machines.

These requirements apply to field-installed machines with form wound windings and rated for applications between 460 V and up to 34,000 V.

This standard also applies to field-installed machines employing random wound windings and rated for applications above 1,000 V and up to 7,200 V.

Machines intended for use in hazardous locations as defined in the National Electrical Code, NFPA 70, may have additional requirements to be met as specified in the National Electrical Code, NFPA 70.

These requirements do not cover sealed (hermetic type) motor-compressor parts, which are evaluated under the Standard for Hermetic Refrigerant Motor-Compressors, UL 984.

These requirements do not cover special generators (such as hydrogen cooled (turbo) generators) rated 10 MVA and above which are covered under IEEE C50.12, IEEE Standard for Salient-Pole 50 Hz and 60 Hz Synchronous Generators and Generator/Motors for Hydraulic Turbine Applications Rated 5 MVA and Above; IEEE C50.13, IEEE Standard for Cylindrical-Rotor 50 Hz and 60 Hz Synchronous Generators Rated 10 MVA and Above; or IEC 60034-3, Rotating electrical machines - Part 3: Specific requirements for synchronous generators driven by steam turbines or combustion gas turbines.