N.E.M.A. Handbook of Appartus StandardsNational electrical manufacturers association, 1928 - 348 páginas |
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N.E.M.A. Handbook of Appartus Standards National Electrical Manufacturers Association Visualização integral - 1928 |
Palavras e frases frequentes
60 cycles A. I. E. E. Rule Additive Polarity Adopted Standard Revised alternating current ambient temperature American Standard-Approved 7-9-1925 AMMETER amperes apparatus is ap applied armature battery brush cent Class A insulation coils COMMUTATING POLES Contactor Continued designed device diameter dielectric tests direct current full load fuse H2 Additive H2 Subtractive Polarity high voltage horsepower incl indicating INDUCTION MOTOR instrument Kv-a limits machine machine diagram Manufacturers Manufacturing Practice maximum nameplate NOTE I-See Rule NOTE I-The oil circuit breakers operation overload panel paratus so constructed Polarity X1 X2 Proof Apparatus purpose motors rated load rated voltage Reactance Recommended Practice relay REPULSION MOTOR resistor RHEOSTAT rotor shaft specified split phase Standard voltages subscript numerals Subtractive Polarity X1 switchboard switching equipment taps temperature guarantees temperature rise terminal test voltage three phase tight apparatus tion torque trans Volt-ampere Voltage Ratings volts Wattmeter wire
Passagens conhecidas
Página 103 - Points of Application of Voltage. The test voltage shall be successively applied between each electric circuit and all other electric circuits and metal parts grounded.
Página 46 - Adjustable-speed motors, in which the speed can be varied gradually over a considerable range, but when once adjusted remains practically unaffected by the load, such as shunt motors designed for a considerable range of speed variation.
Página 131 - A waterproof machine is a totally enclosed machine so constructed that a stream of water from a hose (not less than 1 in.
Página 88 - The Standard Test for All Classes of Apparatus, Except as Otherwise Specified, Shall be Twice the Normal Voltage of the Circuit to Which the Apparatus is Connected, Plus 1000 Volts.
Página 166 - Controller: A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.
Página 168 - Overload protection (overcurrent protection). Overload protection is the effect of a device operative on excessive current, but not necessarily on short circuit, to cause and maintain the interruption of current flow to the device governed.
Página 160 - A device which serves to govern the operation of contactors and auxiliary devices of an electric controller (American Standard).
Página 234 - A master switch is a switch which serves to govern the operation of contactors and auxiliary devices of an electric controller.
Página 168 - Undervoltage or lowvoltage protection is the effect of a device operative on the reduction or failure of voltage to cause and maintain the interruption of power in the main circuit.
Página 172 - An insulation is considered to be "impregnated" when a suitable substance replaces the air between its fibers, even if this substance does not completely fill the spaces between the insulated conductors. The impregnating substances in order to be considered suitable, must have good insulating properties; must entirely cover the fibers and render them adherent to each other and to the conductor; must not produce interstices within itself as a consequence of evaporation of the solvent or through any...