I did an install in a fuel facility where I had to install a bolt-in, molded case breaker in a 208 volt panel. The plant electrician helped me follow company policy.
- my voltmeter was tested
- power to the panel was locked out at the main switch for the building
- power to the building was locked at the main switch for the plant transformer. We took down the entire plant.
- I had to wear rated cover-alls, hot gloves and a shield
- A look-out man made sure I was okay and ran a flashlight.
- when the panel was open we tested for power, but I kept the gloves and shield in case it was re-energized while I was working. This is where the flashlight was needed because I couldn't see in the dark to test for power.
- an independent safety inspector monitored the operation and stopped me in the middle to discuss possible hazards (pinched fingers, etc).
Even then, I didn't have to use insulated tools.
