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This standard covers definite purpose switching devices for use in metal-enclosed low-voltage power circuit breaker switchgear. The switching devices shall be fused, drawout type, three-pole construction, with one or more rated maximum ac voltages of 600 V, 508 V, and 254 V for application on systems having nominal ac voltages of 600 V, 480 V, and 240 V. The switching devices are power operated with integral or separately mounted overcurrent protective devices. This standard addresses service conditions, ratings, functional components, temperature limitations and classifications of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application. The switching devices are normally used in applications that require frequency of operation greater than normal operations expected of low-voltage power circuit breakers.

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This document provides in compact form recommendations and technical reasons for the selection, design and application of aircraft electric power systems and electrically-actuated load equipment, without going into specific detailed designs. The standard was originally published in 1960 as AIEE 750. Sections of this guide are: introduction; criteria for the electric system; characteristics of alternating-current generators affecting their application; distribution system design; symmetrical components; principal subdivisions of electric system; selection of the system; installation practices; equipment characteristics; and electric system design procedures.

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Metal-enclosed interrupter (MEI) switchgear assemblies containing, but not limited to, such devices as interrupter switches; selector switches; power fuses; circuit breakers; control, instrumentation and metering devices; and protective equipment are included in this standard. It includes, but is not specifically limited to, equipment for the control and protection of apparatus used for distribution of electrical power.

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This standard is a revision of American National Standard Specifications for Distribution Fuse Disconnecting Switches, Fuse Supports, and Current Limiting Fuses, ANSI C37.47-1969, to bring it up to date and in line with present requirements for high-voltage fuses and switches.

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Electric filters --- Power electronics. --- Switching power supplies. --- Design and construction.