IEEE C37.20.4-2013 pdf download IEEE Standard for Indoor AC Switches (1 kV to 38 kV) for Use in Metal-Enclosed Switchgear
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE StandardsDictionary: Glossary ofTerms & Definitions should be referenced for terms not defined in this clause.
bypass switch: A nonload break switch used in parallel with another device such that closing the bypassswitch will commutate current flow in the parallel device and allow it to be removed from the circuit.Example: This switch is used in switchgear for bypass feeders and in transfer bus schemes.
integral switch and fuse: A switch in combination with fuses. The fuses may be attached to or in closcproximity (series connected) to the switch.
production tests: Tests made for quality control by the manufacturer on every device or on representativesamples, or on parts or materials as are required to verify during production that the product meets thedesign specifications and applicable industry standards.
Certain quality assurance tests on identifed critical parts of repetitive high-production devices may betested on a planned statistical sampling basis.
NOTE–Production tests are sometimes called “routine tests.”!。
switch: A device designed to close or open, or both, one or more electric circuits.
In this standard, the term “switch” does not imply that the device has interrupting capability. A switch maynot be capable of making or breaking current.
tin-coated or equivalent: Metallic materials having satisfactory long-term performance that operate withinthe limits established for tin-surfaced electrical contact parts and conducting mechanical joints.
4.Service conditions
Clause 2 of IEEE Std C37.100.1-2007 does not apply.
Usual service conditions–Switches conforming to this standard are intended to be used in metal-enclosedswitchgear and shall be subject to the normal service conditions in accordance with IEEE Std C37.20.2% orIEEE Std C37.20.3.