A fuse box in a house must be 100amps?
Answers:
The National Electrical Code (NEC) article 230.79 states "Rating of Service Disconnecting Means. The service disconnecting means shall have a rating of not less than the load to be carried, determined in accordance with Article 220. In no case shall the rating be lower than specified in 230.79(A), (B), (C) or (D)."
(A) Discusses one-circuit installation, not applicable here.
(B) Discusses two-circuit installation, not applicable here.
(C) States "One-Family Dwelling. For a one-family dwelling, the service disconnecting means shall have a load rating of not less than 100 amperes, 3-wire."
(D) Discusses all others, not applicable here.
100 amps is the minimum and 200 amps is typical. If you are going to upgrade your service, I recommend 200 amps.
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