Yes, you can safely install a 100-amp subpanel fed from a 200-amp main electrical service panel, provided the main service load calculations support the additional power draw. According to the National Electrical Code, the total combined electrical load of both panels must not exceed the 200-amp service capacity of the main utility feed. The subpanel must be protected at the main panel by a dedicated 100-amp (or smaller) double-pole breaker and utilize correctly sized copper or aluminum conductors.
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