Lockout

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Common sense says that the supply should be locked out IF someone else could accidently or mailicously turn it on and endanger the person changing the ballast.
If however the means of isolation is within sight of the ballast being changed, then I see no need for locking out.

Here in the UK I certainly dont bother with locking out to change ballasts if the light switch is within sight. If however the power could be turned on remotely then I either lock it out or take other precautions.

Most office and industrial light fittings are plugged into special outlets, and may be safely unplugged whilst energised, thereby ensuring safety in repair or replacement.
 
I thought the whole point of the new code requirement - that there be a disconnecting means at the fixture (meaning: those little snap-connects)- was so that we didn't need to kill the circuit.
 
It's also because working a retail site you never really know how it got wired. Maybe the panel's marked wrong. Maybe it's backfed. Nothing like having a circuit that gets turned off by the marked breaker only to be turned back on when someone turns the light on in the freezer department.
 
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