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The recent focus on NFPA70E requirements is good, but it’s not enough. That standard, though excellent, doesn’t address all the safety issues that arise when accessing a panel. Here are some more:
And obviously, NFPA70E isn’t intended to address breaker replacement. To avoid disaster:
If you don’t know the available fault current at the location, and are just adding to an existing panel of breakers look at the KAIC of the other breakers. Install one of the same or higher rating. This assumes the original installer didn’t err in breaker selection and won’t make the situation worse if he did. Verify soon.
Source: Mark Lamendola | Mindconnection