The National electrical code (NEC®) requires a separate disconnect means within sight of all motor loads. The NEC requires the disconnecting means in a motor circuit be listed as "Suitable as motor disconnect if the motor is rated greater than 2 hp. Hubbell’s revolutionary Circuit-Lock interlock incorporates the disconnect switch and receptacle in one compact, non-metallic and economical unit. Removing the plug and locking it out provides a visual means of verifying equipment has been disconnected. all Circuit-Lock mechanical interlocks can be locked out as a method of compliance with the OSHA lockout/tagout regulation. The switch cannot be turned on until the plug is completely engaged, and the plug cannot be removed until the switch is turned off. at the same time, it eliminates the possibility of making or breaking the circuit under load or making a casual or "lazy" connection. The non-metallic enclosure can be connected to the metallic conduit and not interfere with the ground continuity. In addition, These horsepower rated units are durable, watertight and easy to install. and they are compatible with IEC 60309-2 plugs. These Circuit-Lock units are available in 20, 30, 60 and 100A models, and in 3, 4 and 5-wire configurations that are designed to the IEC 60309-1 and 60309-2 standards. Hubbell’s Circuit-Lock mechanical interlocks are also available in "Reverse service versions. These units incorporate the disconnect switch and reverse service receptacle (inlet) in one compact, non-metallic and economical unit. These units are available in 30, 60 and 100A models, 4 wire configurations.