NEC Table 310.15(B)(16).

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Maine has additional state-specific resources including laws, rules, and most common electrical law violations based on the 2020 National electrical Code (NEC).

See below section or click on the following link to view all of the most common electrical violations in Maine: Common Law Violations

Common 2020 National Electrical Code Violations:

  1. A commercial service supplied with 2 AWG aluminum service-entrance conductors is protected at 100 amps. [Table 310.15(B)(16)]

For conductor types rated at 75°C, Table 310.15(B)(16) lists the ampacity of AWG 2 aluminum as 90 amps. According to 240.6(A), a 90 amp overcurrent device is a standard size. It is rare that the ampacity in the 90°C column can be used, since all circuit terminations, conductors and equipment would have to be rated for 90°C [see 110.14(C)]. For a residential service section 310.15(B)(7) permits 2 AWG aluminum to be protected at 100 amps.

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NEC Table 310.15(B)(16).

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true of a service supplied with 2 AWG aluminum service-entrance conductors?

A: For a residential service, section 310.15(B)(7) permits 2 AWG aluminum to be protected at 100 amps.
B: For a commercial service, section 310.15(B)(7) permits 2 AWG aluminum to be protected at 100 amps.
C: For any service, section 310.15(B)(7) permits 2 AWG aluminum to be protected at 100 amps.
D: 2 AWG aluminum Type THW conductors are not permitted in Maine.
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