Summary
Highlights
General Use Switch00:00:09
A general use switch is rated in amperes and can interrupt its rated current at its rated voltage. These switches are commonly found in general distribution and branch circuits.
General Use Snap Switch00:00:47
A general use snap switch is a common type of general use switch typically found in homes. These are covered in Article 404 of the NEC, which specifies ratings and installation requirements, such as allowing a 15-amp switch on a 20-amp circuit if the current does not exceed 15 amps.
Motor Circuit Switch00:01:36
Unlike general use switches, a motor circuit switch is rated in horsepower. This rating is crucial because it indicates the switch's ability to interrupt the maximum overload current of a motor with the same horsepower rating as the switch itself. If a switch lacks a horsepower rating, it is not a motor circuit switch.
Transfer Switch00:02:47
A transfer switch is a device that transfers conductor connections from one power source to another, such as switching from utility power to a generator. Its primary purpose is safety, isolating the utility grid from backup power sources to prevent back-feeding, which can endanger utility workers. Transfer switches are required for emergency, legally required standby, and optional standby systems under Articles 700, 701, and 702 of the NEC.