When preparing to install the circuit breaker and wiring for the fire alarm control panel, there is another person doing other work on the load side of the panel. They have the disconnect feeding the transformer deenergized and locked out. Which of the following is the correct method to proceed before doing your work?

When preparing to install the circuit breaker and wiring for the fire alarm control panel, there is another person doing other work on the load side of the panel. They have the disconnect feeding the transformer deenergized and locked out. Which of the following is the correct method to proceed before doing your work?

• A. The panel is locked out, so you can proceed
• B. Install your lock also
• C. Have the person remove their lock and put on your lock
• D. Wait until the other person is finished and proceed

Answer: (B)

When multiple workers are on the same equipment, each person must establish their own energy control. Even though the disconnect feeding the transformer is already deenergized and locked out by someone else, you must place your own lock (and tag) on that device. This creates a two-person lockout, so the circuit cannot be reenergized until both locks are removed by their respective owners. Do not remove another person’s lock or rely on their lock alone, and you don’t need to wait if you can safely proceed with your own lock in place.

When multiple workers are on the same equipment, each person must establish their own energy control. Even though the disconnect feeding the transformer is already deenergized and locked out by someone else, you must place your own lock (and tag) on that device. This creates a two-person lockout, so the circuit cannot be reenergized until both locks are removed by their respective owners. Do not remove another person’s lock or rely on their lock alone, and you don’t need to wait if you can safely proceed with your own lock in place.