Final answer:
The wire size for a 100 amp sub panel should be at least 3 AWG for copper wire or 1 AWG for aluminum wire, according to guidelines in the National Electrical Code (NEC). It's important to consult the NEC and a licensed electrician for accurate specifications.
Step-by-step explanation:
In order to determine the wire size for a 100 amp sub panel, you need to consider the maximum current that the wire can safely carry. The wire size is determined by the ampacity rating, which is the maximum current that a wire can continuously carry without overheating.
For a 100 amp sub panel, the wire size should be at least 3 AWG (American Wire Gauge) for copper wire or 1 AWG for aluminum wire.
It's important to consult the National Electrical Code (NEC) regulations and consider factors such as the length of the wire run and the type of insulation used. You may also need to consult a licensed electrician for specific recommendations.
Keep in mind that this is a general guideline, and it's always best to consult the appropriate electrical code and a professional electrician for accurate specifications.