IEEE C37.41-2008 pdf free download – IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses, Fuse and Disconnecting Cutouts, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Fuse Links and Accessories Used with These Devices.
1.5 Description of FEPs using current-limiting type indoor distribution and power class fuses
Type 1CL: A fuse mounted in a large enclosure with relatively free air circulation within the enclosure (e.g., a fuse mounted in a live-front pad-mounted transformer or in a vault). The relevant fuse rated maximum application temperature (RMAT) is based on that of the air that is cooling the fuse. It may be noted that if a fuse were mounted outdoors but in an ambient temperature above 40 ºC, conditions on the fuse would be the same.
Type 2CL: A fuse mounted in a fuse container. This is a relatively small enclosure, defined as one supporting the fuse and restricting the air, gas, or liquid flow surrounding the fuse (e.g., a fuse inside a canister in a transformer or a vault). However, the fluid flow (gas, liquid, or a combination of the two) that cools the outside surface of the container has relatively free circulation. The relevant fuse RMAT is based on that of the fluid that is cooling the container. Fuses tested in accordance with 6.6 (i.e., tested for use in air no hotter than 40 ºC), which are encapsulated with solid insulation (e.g., rubber or epoxy), can be considered to be this type of FEP when so encapsulated. In this case, the relevant fuse RMAT is based on that of the fluid that is cooling the encapsulated fuse.
Type 3CL: A fuse directly immersed in liquid and mounted in an enclosure with relatively free liquid circulation around the fuse (e.g., an oil-immersed fuse in a transformer or switchgear enclosure). The relevant RMAT is based on that of the liquid that is cooling the fuse.
NOTE—In IEEE Std C37.41 TM -2000 and the versions of ANSI C37.46, ANSI C37.47, and IEEE Std C37.48 TM approved before this standard, FEPs using current-limiting fuses are designated as being of types 1C through 5C. In order to simplify FEP types, include additional types, and align with IEC practice, these types have been rationalized into three categories. Type 2CL includes the former types 2C, 3C, and 4C, whereas type 3CL is the same as type 5C. The new classifications will be introduced into the other standards when they are revised.
3 2. Normative references The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so that each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies. ANSI C37.42, American National Standard Specifications for High Voltage Expulsion Type Distribution Class Fuses, Cutouts, Fuse Disconnecting Switches and Fuse Links.
4 ANSI C37.46, American National Standard for High Voltage Expulsion and Current-Limiting Type Distribution Class Fuses and Fuse Disconnecting Switches. ANSI C37.47, American National Standard for High Voltage Current-Limiting Type Distribution Class Fuses and Fuse Disconnecting Switches. ANSI C63.2-1987, American National Standard for Electromagnetic Noise and Field Strength Instrumentation, 10 kHz to 1 GHz
—Specifications. IEC 60282-1, High Voltage Fuses
—Part 1, Current-Limiting Fuses. IEEE C37.41 pdf download.