Electric Switch Definitions - NEC Article 100




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:







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


Switch, General-Use: see fig.1

 
fig (1): 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: 
see fig.2



fig (2):  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: 
see fig.3



fig (3) :  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: 
see fig.4



fig (4):  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: 
see fig.5


fig (5):  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: 
see fig.6



fig (6):  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) 
see fig.7



fig (7):  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.


I think that each term definition and its photo be able to explain the term precisely. but if any one have still have a confusion about these terms, please contact me directly by posting a comment with your question and I will reply immediately.


In the next topic , new definitions from NEC Code Article 100 will be highlighted.



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