Superseded Standard

AIEE 1B-1944

AIEE Report on Guiding Principles for the Specification of Service Conditions in Electrical Standards

In the various standards there will be found a number of different situations regarding Usual Service Conditions. The following three are typical. 1. The group where the maximum ambient temper­ature is specified. The Standards for Bushings, Fuses, Lightning Arresters, Protector Tubes and Potential Devices where 40 C ambient is used and Marine Equipment where 50 C ambient is used are typical of this group. 2. The group where both the maximum and daily average temperatures of the cooling medium are specified. Standards for Transformers, Regulators and Neutral Grounding Devices are typical of this group. 3. The group where a higher ambient temperature is specified for silver contacts than for copper con­tacts. Standards for Circuit Breakers, Air Switches and Switchgear Assemblies are typical of this group. It is suggested that a selection of one of the fol­lowing groups can be made for the statement of Usual Service Conditions in most of the standards for specific equipment.

Status
Superseded Standard
Board Approval
1944-05-23
History
Published:
1943-11-30

Working Group Details

No Active Projects
No Active Standards
No Superseded Standards
No Inactive-Withdrawn Standards
No Inactive-Reserved Standards
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