Help with Meter Breaker Combo
Snapping in the sixth throw (the new breaker), or clamping on a new subfeed on to an existing feed wire or bus, does not mandate pulling of the meter. However only an experienced person should be doing it because the exposes busses can deliver over a thousand amps for more than just a brief interval in the event of a slip of the hand and a short circuit because there is no breaker between there and the pole transformer. Metal parts would not just melt; they could vaporize and this makes for an explosion.
If you needed to disconnect a feed wire, say to upgrade the feed to 200 amps, you need to have the meter pulled.
Even 200 amps for a brief interval can cause a scary spark if your hands slip and a short circuit happens. So even with a panel with a main breaker, only experienced persons should do work inside. And there are some parts inside that are still alive even when the main breaker is off.
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Last edited by AllanJ; 08-01-2011 at 07:37 AM.