120v operator station labeling?
120v operator station labeling?
I have arc flash labels on 480v machines throughout the plant that show the PPE requirements and boundaries for both shock and arc flash hazards. A detailed analysis was performed to determine the incident energy using SKM program. I don't have many complaints regarding ratings and requirements for switchgears and industrial control panels from my personnel; they seem to understand that big panels may require extensive PPE. The problems are how to address the small stuff: such as remote operator interface panels on machinery, small 240/120v receptacle panels, etc.
I've done detailed analysis to 480v industrial control panel and determined it to be <1.2 cals. Panel contains 10kva transformer for 120v control power.
1. What labeling is required for remote operator stations that have 120v pushbuttons and selector switches?
2. Should the label have the full-blown shock data?
3. If I put a 1.2 cal arc flash rating on it, doesn't the machine operator have to wear cat 0 PPE which would have to be provided by the company? This could become very costly as everyone is a machine operator.
Where does 70E address this very low energy issue?