310.1 Scope.
Code Change Summary: Revised scope of Article 310.
In the 2020 NEC®, Article 310 was completely reorganized beginning with the relocation of all medium voltage requirements into a new Article 311. Now, Article 310 only applies to conductors rated up to and including 2000 volts This change also resulted in the renumbering of sections and tables in Article 310.
- Section 310.15(B)(7), pertaining to single-phase dwelling services and feeders, is now Section 310.12 and the associated table has returned but can only be used if no adjustment or correction factors are required.
- Previous ampacity Table 310.15(B)(16) is now good old Table 310.16 like it was prior to the 2011 NEC® code cycle.
- The notes under Table 310.16 have been restructured and are easier to follow.
- Table 310.104(A) which provides conductor applications and insulation properties has been moved from the back of the article to the front and is now Table 310.4(A).
- The conductor marking requirements in 310.120 have been moved to the front of the article and are now found in 310.8.
- Parallel conductor requirements were moved from 310.10(H) to 310.10(G).
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 2020 NEC® edition of NFPA 70.
2017 Code Language:
310.1 Scope. This article covers general requirements for conductors and their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses. These requirements do not apply to conductors that form an integral part of equipment, such as motors, motor controllers, and similar equipment, or to conductors specifically provided for elsewhere in this Code.
2020 Code Language:
310.1 Scope. This article covers general requirements for conductors rated up to and including 2000 volts and their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses. These requirements do not apply to conductors that form an integral part of equipment, such as motors, motor controllers, and similar equipment, or to conductors specifically provided for elsewhere in this Code.