Also if you have multiple VFD's in one cabinet and you are changing one but the rest are powered up would a wok permit be required?
Good morning Kristopher, It seems that you may have two different situations that you are asking about. As to your first question, NFPA 70E (2018) 130.2(B)(2) would apply. In most MCC buckets that I have had the experience of working on the line side to the breaker or disconnect is guarded and there are no exposed energized conductors or circuit parts but that there would be an increased likelihood of exposure to an arc flash hazard.
In reference to your second question, if there are exposed energized conductors or circuit parts within the restricted approach boundary then an energized electrical work permit would be required. In motor control enclosure that contain multiple VFD's or other motor control equipment one of the potential hazards is "look-alike equipment".
I hope that this is helpful to you.
The question and Answer:
1. Is the worker exposed to live (energized) parts? Example troubleshooting power to bucket. If exposed, a permit is required unless the procedure has already been deemed routine.
2. Is this a routine application the worker has already been given authority to work on energized? If yes, no permit required
3. Are barriers or is a curtain available that prohibits the worker from being exposed once the door is open?
Hope this helps
Please provide references to what is deemed routine.
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