acerfootball
Member
- Location
- Madison, WI, US
First off, I'm am extremely impressed with the content on this forum. This will definitely be my go to with electrical safety questions in the future.
With that said, I'm still learning the ins and outs of 70E and have a question regarding the maintenance with drive and PLC panels. We build custom automated machinery that always have multiple drive panels and at least one plc panel. Our technicians often are opening these panels and connecting via Ethernet to make changes to the code. These machines are meant to run continuously so shutting down these panels is never preferred. But my thinking is that according to 70E they need to be since once the panel door is open the technician will be exposed to live bus bar or live dim rails. The PLC usually run on 24 VDC so we might be good there but the drive panels have 480. Am I reading the code correctly when I say that unless an energized work permit is obtained those panels need to be put in a safe working condition (or denergized) in order for anyone to open them up?
Thanks in advance!
With that said, I'm still learning the ins and outs of 70E and have a question regarding the maintenance with drive and PLC panels. We build custom automated machinery that always have multiple drive panels and at least one plc panel. Our technicians often are opening these panels and connecting via Ethernet to make changes to the code. These machines are meant to run continuously so shutting down these panels is never preferred. But my thinking is that according to 70E they need to be since once the panel door is open the technician will be exposed to live bus bar or live dim rails. The PLC usually run on 24 VDC so we might be good there but the drive panels have 480. Am I reading the code correctly when I say that unless an energized work permit is obtained those panels need to be put in a safe working condition (or denergized) in order for anyone to open them up?
Thanks in advance!