UL 1004-4

Description / Abstract: This Standard is intended to be read together with the Standard for Rotating Electrical Machines – General Requirements, UL 1004-1. The requirements in this Standard supplement or amend the requirements in UL 1004-1. The requirements of UL 1004-1 apply unless modified by this Standard.

This Standard covers electric generators, sometimes referred to as generator heads, which, when coupled with prime movers, such as engines or electric motors, are used to produce electricity. This Standard covers generators (DC machines) and alternators (AC machines) rated 7,200 volts or less.

This Standard does not cover stationary or portable generator assemblies, which are respectively covered under the Standard for Stationary Engine Generator Assemblies, UL 2200, and the Standard for Portable Engine-Generator Assemblies, UL 2201.

This Standard does not cover generators intended for use in hazardous locations as defined in the National Electrical Code ®, NFPA 70.

The National Electrical Code® and NEC® are registered trademarks of the National Fire Protection Association, Inc., Quincy, MA 02169.

In the context of this document, the term generators shall be understood to apply to both AC and DC machines.