Electric Switch Definitions - NEC Article 100

[ali hassan]

in the previous Topics of course " Understanding NFPA 70 (National
electrical code) " , we explained a lot of definitions introduced in
Article 100 which were as follows:


Accessibility term definitions.
identified, listed and approved terms definitions.
Bonding term definitions.
Branch Circuit term definitions.
Grounding term definitions.
Circuit Breaker term definitions.

today, I will explain the term " Electric Switch " definitions as
follows:


Switch, General-Use:
A switch intended for use in general distribution and branch
circuits. It is rated in amperes, and it is capable of interrupting
its rated current at its rated voltage.

Switch, General-Use Snap:
A form of general-use switch constructed so that it can be installed
in device boxes or on box covers, or otherwise used in conjunction
with wiring systems recognized by this Code.

Switch, Isolating:
A switch intended for isolating an electric circuit from the source
of power. It has no interrupting rating, and it is intended to be
operated only after the circuit has been opened by some other means.

Switch, Motor-Circuit:
A switch rated in horsepower that is capable of interrupting the
maximum operating overload current of a motor of the same horsepower
rating as the switch at the rated voltage.

Switch, Transfer:
An automatic or non-automatic device for transferring one or more
load conductor connections from one power source to another

Switch, Bypass Isolation:
A manually operated device used in conjunction with a transfer switch
to provide a means of directly connecting load conductors to a power
source and of disconnecting the transfer switch.

Thermal Protector (as applied to motors)
A protective device for assembly as an integral part of a motor or
motor-compressor that, when properly applied, protects the motor
against dangerous overheating due to overload and failure to start.

FPN:The thermal protector may consist of one or more sensing elements
integral with the motor or motor-compressor and an external control
device.

Thermally protected (as applied to motors)
The words thermally protected appearing on the nameplate of a motor or
motor-compressor indicates that the motor is provided with a thermal
protector.


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