dsvinson1
Member
- Location
- Radford, VA USA
Performing an arc flash study for an industrial facility. I would like to know the labeling requirement or best practice for labeling of the following types of equipment:
1) Non-fused 3ph disconnect switch that is just used as a lock out / tag out point. I have been told before that since it was just a 'LOTO' point, it doesn't require labeling. However, I would think it would if there is any chance personnel could open it for any reason while line side still supplied with power.
2) 3ph 480V receptacles available for portable welding or other electrical equipment. In one case, I have several of these receptacles fed by one circuit breaker. Obviously, anyone inserting a plug in one of these receptacles is well inside arc flash boundary. To what extent are these receptacles arc resistant?
1) Non-fused 3ph disconnect switch that is just used as a lock out / tag out point. I have been told before that since it was just a 'LOTO' point, it doesn't require labeling. However, I would think it would if there is any chance personnel could open it for any reason while line side still supplied with power.
2) 3ph 480V receptacles available for portable welding or other electrical equipment. In one case, I have several of these receptacles fed by one circuit breaker. Obviously, anyone inserting a plug in one of these receptacles is well inside arc flash boundary. To what extent are these receptacles arc resistant?