Once there, click on their link to free access to the 2020 NEC ® edition of NFPA 70. 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. See the actual NEC ® text at NFPA.ORG for the complete code section. See code language below.īelow is a preview of the NEC ®. In addition, the notes under the table have been reworded for usability and the title of the table has been shortened up significantly. In the 2020 NEC ®, with the restructuring that occurred from moving the medium voltage conductor requirements from Article 310 to new Article 311, ampacity Table 310.15(B)(16) has been given its old title back and is now, once again, Table 310.16. Table 310.16 was so well known before the 2011 code change that every code cycle since, including the 2017 NEC ®, there has been the following reminder at the top of the table: “Table 310.15(B)(16) (formerly Table 310.16) ”. With restructuring that occurred in the 2011 NEC ®, Table 310.16 was retitled “Table 310.15(B)(16)”. Going back to the power circuits, it is also mandatory to use conductors that can withstand 90☌, but they cannot exceed 75☌ in temperatura: that means their ampacity. Back in the 2008 NEC ® and before, the most commonly used ampacity table was Table 310.16. Section 310.15(B) shall be referenced for ampacity correction factors where the ambient temperature is other than 30 C (86 F). In general, conductor ampacities of power circuits, inside control panels, are stated in Table 28.1 of UL 508A, while for c ontrol circuits the table to be used is Table 38.1. Code Change Summary: Restructuring of Article 310 results in restoring the most commonly used ampacity table’s beloved title.įor 9 years now the electrical community has had a mouthful every time the most commonly used ampacity table was mentioned in conversation or spoken of during a seminar.
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