For a task on a fixed circuit part at 480 V nominal, what is the correct limited approach boundary distance?

For a task on a fixed circuit part at 480 V nominal, what is the correct limited approach boundary distance?

• A. 2 ft 6 in
• B. 3 ft 6 in
• C. 4 ft 0 in
• D. 5 ft 0 in

Answer: (B)

The distance is set by the voltage level and the safety boundary you’re using to protect against shock. For a fixed circuit part operating at 480 V nominal, the standard boundary that defines the limited approach distance is 3 ft 6 in (about 1.07 meters). This value comes from the electrical safety tables that map voltages to corresponding approach boundaries, and 480 V falls into the category that requires 3 ft 6 in for the limited approach boundary. The other distances would correspond to different voltage categories or different boundaries, so 3 ft 6 in is the correct, standard distance to maintain for this voltage when working near exposed live parts.

The distance is set by the voltage level and the safety boundary you’re using to protect against shock. For a fixed circuit part operating at 480 V nominal, the standard boundary that defines the limited approach distance is 3 ft 6 in (about 1.07 meters). This value comes from the electrical safety tables that map voltages to corresponding approach boundaries, and 480 V falls into the category that requires 3 ft 6 in for the limited approach boundary. The other distances would correspond to different voltage categories or different boundaries, so 3 ft 6 in is the correct, standard distance to maintain for this voltage when working near exposed live parts.