scope:

This specification covers the general requirements for electrically operated non-hermetically sealed meters that automatically measure, and cumulatively register the total operating or idle time of the circuit, machine or system to which connected.

Time totalizing meters covered by this specification shall be of the following types and grades:

Type I - Direct Current, Total Capacity: 10,000 hours

Type II - Alternating Current, Total Capacity, As Follows:

Class 1. 120V, 60Hz - 100,000 hours

Class 2. 120V, 60Hz - 10,000 hours

Grade A - With Electromagnetic Compatibility

Grade B - Without Electromagnetic Compatibility

intended Use:

The time totalizing meters covered by this specification are intended for accurately recording equipment operating hours.