IEEE - ANSI C37.47
High Voltage Current-Limiting Type Distribution Class Fuses and Fuse Disconnecting Switches
|Publication Date:||3 May 2000|
This standard establishes specifications for high voltage (above 1000 volts) distribution class current limiting type fuses and associated accessories. All of these devices are intended for use on alternating current systems. These specifications apply to the following specific types of equipment:
a) Distribution class current limiting type fuses and fuse units.
b) Distribution class current-limiting fuse disconnecting switches.
c) Items (a) thru (b) used in fuse enclosure packages (FEP) (see types listed in Clause 1.1 below)
d) Fuse supports, fuse units, refill units and fuse mountings of the type used exclusively with distribution class current limiting type fuses, and fuse disconnecting switches.
e) Removable switch blades of the type used exclusively with distribution class current limiting type fuses, and fuse disconnecting switches.
Note: Some of the distribution class current-limiting type fuses listed above are similar to those now covered in IEC Standard 60282-1. This ANSI standard contains specific requirements for more types of current-limiting fuses than IEC 60282-1. Use caution if devices specified and tested per ANSI/IEEE standards are compared to those specified and tested per IEC standards as they may or may not be the same.
In the headings and the text of this document there will be some areas where information is included in brackets . The information in the brackets is a term used in IEC standards that may be similar to the term we are using, a term that is common in some parts of the world, or is a term that has been used previously in ANSI and IEEE standards. Caution is again advised when making comparisons.
Description of Fuse Enclosure Packages Using Current-Limiting Type Indoor Distribution Class Fuses
Type 1C A fuse mounted in an enclosure with relatively free air circulation within the enclosure. (Examples - A current-limiting type fuse mounted in a live front pad mounted transformer or in a vault.)
Type 2C A fuse mounted in a container with restricted air flow surrounding the fuse, but relatively free air circulation within the enclosure on the outside surfaces of the container. (Example - a current-limiting type fuse inside a canister in a vault.)
Type 3C A fuse mounted in a container with restricted air flow surrounding the fuse, but relatively free liquid circulation within the enclosure on the outside surfaces of the container. (Example - a current-limiting type fuse inside a canister immersed in transformer oil.)
Type 4C A combination of types 2 and 3, where the container is partially in air and partially in liquid. (Example - a current-limiting type fuse inside a transformer bushing.)
Type 5C A fuse mounted in an enclosure, directly immersed in liquid, with relatively free liquid circulation around the fuse. (Example - an oil immersible current-limiting type fuse in a transformer or switchgear enclosure.)