210.19 Conductors - Minimum Ampacity and Size.

Branch circuits are the circuit conductors between the final overcurrent device protecting the circuit and the outlet.
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Branch circuits are the circuit conductors between the final overcurrent device protecting the circuit and the outlet.

Code Change Summary: Previous conductor requirements have been revised based on voltage.

In the 2023 NEC®, restructuring of Section 210.19 was needed to align with the relocation of the rules for branch circuits over 1000V ac and 1500V dc to new Article 235.

Branch Circuits are defined as “The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)”.

In the 2020 NEC®, Section 210.19(A) applied to branch circuits not more than 600 volts, while Section 210.19(B) applied to branch circuits over 600 volts.

In the 2023 NEC®, all of Section 210.19 now applies to branch-circuit conductors for circuits not exceeding 1000 volts ac or 1500 volts dc.

In the 2023 NEC®, the previous heading of Section 210.19(A) specifying the voltage limitation of 600V has been removed, and the previous requirements in Section 210.19(B) were reworded and moved to Article 235.

The parent text in Section 210.19 now specifies that branch-circuit conductors for circuits not exceeding 1000 volts ac or 1500 volts dc shall be sized in accordance with 210.19(A) through (D). Items (A) through (D) basically remain the same with a few editorial changes.

Below is a preview of the NEC®. See the actual NEC® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2023 NEC® edition of NFPA 70.

2020 Code Language:

210.19 Conductors — Minimum Ampacity and Size.

(A) Branch Circuits Not More Than 600 Volts.

(B) Branch Circuits Over 600 Volts.

2023 Code Language:

210.19 Conductors — Minimum Ampacity and Size. Branch-circuit conductors for circuits not exceeding 1000 volts ac or 1500 volts dc shall be sized in accordance with 210.19(A) through (D).

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210.19 Conductors - Minimum Ampacity and Size.

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

Based on the 2023 NEC, which of the following is true?

A: In the 2023 NEC, all of Section 210.19 now applies to branch-circuit conductors for circuits not exceeding 1000 volts ac or 1500 volts dc.
B: In the 2023 NEC, Section 210.19 applies to branch-circuit conductors for circuits not exceeding 600V.
C: In the 2023 NEC, Section 210.19(B) applies to branch-circuit conductors for circuits over 600V.
D: Branch circuits are the circuit conductors between the service overcurrent device and the branch circuit overcurrent device.
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