Article 338.

For clarity, MA has made it a point to mention that Section 338.10(B)(4) includes service entrance cables with a round configuration commonly known as SER cable.
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For clarity, MA has made it a point to mention that Section 338.10(B)(4) includes service entrance cables with a round configuration commonly known as SER cable.

MA amendments.

338.10(B)(4). Insert an informational note as follows:

Informational Note:  This section includes service entrance cables with a round configuration commonly known as SER cable. The interior installation of this cable is governed by the same rules as apply to nonmetallic sheathed cable.

338.10(B)(4)(a)(3). Revise to read as follows:

Where installed in thermal insulation, the ampacity shall be in accordance with the 60°C (140°F) conductor temperature rating. The maximum conductor temperature rating shall be permitted to be used for ampacity adjustment and correction purposes, if the final derated ampacity does not exceed that for a 60°C (140°F) rated conductor.

Click here to see the Massachusetts amendments to the 2023 NEC®.

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Article 338.

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

Which of the following is true regarding SE cable as amended in Massachusetts?

A: Only Type SE cable sizes 10 AWG and smaller in contact with thermal insulation must have the ampacity adjusted in accordance with 60°C (140°F) conductor temperature rating.
B: Only Type SE cable sizes 12 AWG and smaller in contact with thermal insulation must have the ampacity adjusted in accordance with 60°C conductor temperature rating.
C: Where installed in thermal insulation, the ampacity shall be in accordance with the 60°C (140°F) conductor temperature rating.
D: The maximum conductor temperature rating shall NOT be permitted to be used for ampacity adjustment and correction purposes.
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