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Dead Front |
Without live parts exposed to a person on the operating side of the equipment.
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Demand Factor |
The ratio of the maximum demand of a system, or
part of a system, to the total connected load of a system or the
part of the system under consideration.
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Device |
A unit of an electrical system that is intended
to carry but not utilize electric energy.
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Dielectric |
The insulating material between the plates of a
capacitor.
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Diode |
Any two-electrode device that conducts in only
one direction.
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Direct Current |
A current is a continuous flow of electric
current from positive to negative poles.
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Disconnecting Means |
A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.
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Diversity Factor |
The
ratio of the sum of the maximum power demands of the
subdivisions, or parts of a system, to the maxi-mum demand of
the whole system or of part of the system under consideration.
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Dry Location |
A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction.
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Dustproof |
Constructed or protected so that dust will not
interfere with its successful operation.
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Dusttight |
Constructed so that dust will not enter the
enclosing case under specified test conditions.
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Dwelling |
Dwelling Unit. One or more rooms for the use of one or more persons as a housekeeping unit with space for eating, living, and sleeping, and permanent provisions for cooking and sanitation.
Dwelling, One-Family. A building that consists solely of one dwelling unit.
Dwelling, Two-Family. A building that consists solely of two dwelling units.
Dwelling, Multifamily. A building that contains three or more dwelling units.
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Dynamotor |
A
converter with both motor and generator in one magnetic field,
either with two armatures, or with one armature having two
separate windings.
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