Well, except for the potentially significant convenience of not having to turn the power off and verify exposed terminals are dead before unbolting things - as with signal cables, bonding can be removed and re-fitted, as soon as the jumbo mains plug is removed from the supply
As long as you're not importing protective conductor currents from elsewhere.
Yes you can have local isolation switches one per rack, but these in the heat of battle such things can be another source of accidentally switching off the wrong thing.
Same with plug and socket-outlet. They're all just isolators. And many racks will have two feeds (or more) - multiple points of isolation. In terms of accidentally switching off the wrong thing in the heat of the moment, let's also consider Regulation 12 of the Electricity at Work Regulations 1989 which definitely requires "... where appropriate, methods of identifying circuits ...": if it's operationally so important not to "flip the wrong switches", make sure they are properly identified, because this is required for safety in any case.
Well, except for the potentially significant convenience of not having to turn the power off and verify exposed terminals are dead before unbolting things - as with signal cables, bonding can be removed and re-fitted, as soon as the jumbo mains plug is removed from the supply
As long as you're not importing protective conductor currents from elsewhere.
Yes you can have local isolation switches one per rack, but these in the heat of battle such things can be another source of accidentally switching off the wrong thing.
Same with plug and socket-outlet. They're all just isolators. And many racks will have two feeds (or more) - multiple points of isolation. In terms of accidentally switching off the wrong thing in the heat of the moment, let's also consider Regulation 12 of the Electricity at Work Regulations 1989 which definitely requires "... where appropriate, methods of identifying circuits ...": if it's operationally so important not to "flip the wrong switches", make sure they are properly identified, because this is required for safety in any case.
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