Based on the 2011 NEC. See the actual NEC text at NFPA.ORG for the complete code section. This article is not a substitute for the NEC.

Current Edition: 2020. Based on the 2017 NEC.

2014 Code Language: 310.15(B)(3)(c) Raceways and Cables Exposed to Sunlight on Rooftops. Code Quiz: Article 310, Part 1. The requirements for single phase dwelling services and feeders was moved from its current home of 310.15(B)(7) to a new 310… When using conductor ampacity Table 310.15(B)(16), it is important to understand why some conductor sizes have a double asterisk (**). This is a portion of NEC Table 310.15(B)(16). The ampacity tables in Article 310 will simply be titled as Table 310.16 through Table 310.21. As an example, Table 310.15(B)(16) will revert back to its original numbering of Table 310.16. Please note, we do quote from copyrighted material. At the bottom of the table is the following note: **Refer to 240.4(D) for conductor overcurrent protection limitations.

Conductor Ampacity Based on the 2011 National Electrical Code® Ampacity based on NEC Table 310.15(B)(16) (Formerly Table 310.16) – Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 60° Through 90°C (140° Through 194°F), Not More Than Three Below is a preview of Article 310. Once there, click on their link to free access to the 2017 NEC edition of NFPA 70. by Mark Lamendola.

Free NEC 2014: Table 310.15(B)(16) Allowable Ampacities of Insulated Conductors (no more than 3 current carrying conductors in raceway, cable, or Earth) based on Ambient Temperature of 30C. View Document Scope.

Submit a Public Input for the Next Edition. Mark is an IEEE Senior Member, and the Code article author for Codebookcity.com. While the NFPA does allow such quotes, it does so only for the purposes of education regarding the National Electrical Code. National Electrical Code Top Ten Tips: Article 310 -- Conductors for General Wiring. Adopted in all 50 states, NFPA 70, National Electrical Code (NEC) is the benchmark for safe electrical design, installation, and inspection to protect people and property from electrical hazards.

Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer.