Cutler-Hammer® Window Disconnect Provides a Quick and Safe Lockout/Tagout Solution
 
The 2008 National Electric Code (NEC) Article 430.102 (B)(1) Separate Motor Disconnect reads, “A disconnecting means for the motor shall be located in sight from the motor location and the driven machinery location.” This code requirement is written to ensure zero electrical energy at the driven machinery by disconnecting the motor source. Conducting a voltage test is required before lockout/tagout; however, there is a flash-hazard risk involved in doing so.

A solution to this requirement is the Cutler-Hammer Window Disconnect, including a jog-off-auto selector and motor run indicating light. The window allows the operator to visually inspect all three blades before lockout, which provides a safe and easy solution for lockout/tagout while maintaining the requirements of the NEC. The selector switch and indicating light are used as a part of the “lock-tag-try” procedure outlined in the NFPA-70E Electrical Workplace Standard, assuring a safe lockout/tagout before equipment lockout and again before equipment is re-energized. The innovative window disconnect with local controls helps factories to improve safety and reduce down time that can be associated with the availability of an electrician to suit-up with appropriate PPE and lock out equipment at the motor control center (MCC).

Although NEC 430.102 includes fine print notes that allow for omission of a line of sight disconnecting means in industrial installations with “qualified persons,” this solution is so effective that most users in material handling industries such as wood products have subscribed to this approach. Electrical safe work practices are enhanced, plus an operator can perform lockout/tagout at the driven machinery instead of an electrician at the upstream LV MCC. To learn about the details of the lock-tag-try procedure, click here.