scope:

Foreword 

(This Foreword is not part of American National Standard C37.42-1996)

This standard is a revision of ANSI C37.42-1989, to bring it up to date and in line with present day requirements for high-voltage fuses, fuse links and fuse disconnecting switches.

This standard was prepared by the NEMA High Voltage Fuse Technical Committee with cooperation from the IEEE Subcommittee on High Voltage Fuses. Liaison was maintained with Edison Electric Institute (EEI) and International Electrotechnical Commission (IEC) during the development of the revisions in order to incorporate the latest thinking up to the time of publication.

This standard is one of a series of complementary standards covering various types of high-voltage fuses and switches, arranged so that certain standards apply to all devices while other standards provide additional specifications for a particular device. For any device, ANSI/IEEE C37.40-1993, ANSI/IEEE C37.41-1994, plus the additional standard covering that device, constitute a complete standard for the device. In addition, ANSI/IEEE C37.48-1987 (R1992) is an application, operation, and maintenance guide for all the devices.

The following standards make up this series:

ANSI/IEEE C37.40-1993, Service Conditions and Definitions for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories

ANSI/IEEE C37.41-1994, Design Tests for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories

ANSI C37.42-1996, Specifications for High Voltage Expulsion Type Distribution Class Fuses, Cutouts, Fuse Disconnecting Switches and Fuse Links

ANSI C37.44-1981 (R 1992), Specifications for High Voltage Distribution Class Oil Cutouts and Fuse Links

ANSI C37.45-1981 (R 1992), Specifications for High Voltage Distribution Class Enclosed Single-Pole Air Switches

ANSI C37.46-1981 (R 1992), Specifications for High Voltage Expulsion and Current-Limiting Type Power Class Fuses and Fuse Disconnecting Switches

ANSI C37.47-1981 (R 1992), Specifications for High Voltage Current-Limiting Type Distribution Class Fuses and Fuse Disconnecting Switches

ANSI/IEEE C37.48-1987 (R1992), Guide for Application, Operation, and Maintenance of High Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories

Suggestions for improvement of this standard will be welcomed. They should be sent to the National Electrical Manufacturers Association, 1300 North 17th Street, Rosslyn, VA 22209.

Scope 

This standard establishes specifications for high voltage (above 1000 volts) expulsion type distribution class fuses, cutouts, fuse disconnecting switches, fuse links and associated accessories. All of these devices are intended for use on alternating current distribution systems. These specifications apply to the following specific types of equipment:

a) Open, enclosed, and open link types of fuses and cutouts.

b) Open and enclosed fuse disconnecting switches

c) Fuse supports, fuse mountings and fuse hooks of the type used exclusively with distribution class fuses, cutouts, and fuse disconnecting switches.

d) Removable switch blades of the type used exclusively with distribution class fuses, cutouts, and fuse disconnecting switches.

e) Fuse links of the type used exclusively with distribution class fuses, cutouts, and fuse disconnecting switches.

The fuses listed above are the same as those covered in IEC 282-2. The open and enclosed types of "distribution" class fuses and cutouts are the same as the class "A" fuses and cutouts covered in that document.