There are a number of various appropriate methods for disconnecting the appliance, including a unit switch with a clearly designated "off" position, a snap switch with a horsepower rating, or even the branch circuit breaker.
The branch-circuit switch or circuit breaker must be able to be locked in the open position in accordance with 110.25 in order to be used as the disconnecting mechanism for permanently connected appliances rated over 300 volt-amperes when the switch or circuit breaker is within sight of the appliance.
Electrical disconnects are switches that cut off the power to all the wiring in a house or other structure, usually the utility power service. This is the initial disconnect device after the utility meter and is also known as the service disconnect.
Disconnecting means refers to a device, a collection of devices, or any method that enables the conductors of a circuit to be cut off from their power source.
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