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Doug Miller

In article , wrote:
On Mon, 13 Jul 2009 11:33:43 -0700 (PDT), stryped
wrote:

What do you mean if I installed it the same as the main panel it is
wrong? I put a (rated) 100 am sub panel right next to the main panel.
There is a 100 amp breaker in the main panel feeding the sub panel and
also a 100 amp main breaker in the sub panel. the ground in the sub
runs to the grounding bus in the main panel.

One of the 100 amp breakers is redundant. Won't hurt anything but not
required if the panels are side by side.

Specifically the 100A breaker in the subpanel is redundant. The 100A breaker
in the main panel is required, to provide overcurrent protection for the
feeder to the subpanel.

In his new building, he needs both: one whichever panel the feeder is taken
from (to protect the feeder), and one in the subpanel in the new building (to
provide a disconnect for that building).