Quote:
Originally Posted by wa2ise
Be very careful poking around inside a circuit breaker or fuse panel. Not only is there the usual shock hazard, but another serious hazard called "Arc blast". You've seen sparks when a short happens, but most of those had limited small amounts of power behind them. But the feed from the power company to your house has a very large amount of power available to a short circuit. Enough to melt and vaporize say a screwdriver shaft. And you really don't want your face anywhere near that.
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you only should have to turn off the main breaker to clean your ground rod,and if its a newer home it should have second saftey box ground . if you messing around with your lead in wiring before the main breaker you bet youll get a arc blast or what blows the easyest, the screwdriver / meter / or if get enough load the pole fuse will open ,then your power company comes out to vist. if your updating your breaker panel from 100- 200 amp you will have to pull your meter, dont try to it any other way .