Charles R. Miller

Code Contributor

Charles R. Miller, owner of Lighthouse Educational Services, teaches classes and seminars on the electrical industry. He is the author of “Illustrated Guide to the National Electrical Code” and NFPA’s “Electrical Reference.” He can be reached at 615.333.3336, charles@charlesRmiller.com or www.charlsRmiller.com

Articles by Charles R. Miller

August 2012
Table 310.15(B)(16) in the National Electrical Code (NEC) provides allowable or maximum ampacities for insulated conductors rated up to and including 2,000 volts (V). When sizing conductors, more is involved than just looking in Table 310.15(B)(16) and selecting a conductor based on the ampacity shown. READ MORE
July 2012
Ambient temperature and the number of current-carrying conductors installed in a raceway or cable are two factors to consider when sizing conductors. In accordance with 310.15(A)(3) in the National Electrical Code (NEC), no conductor shall be used in such a manner that its operating temperature exceeds the limit designated for the type of insulated conductor involved. READ MORE
June 2012
When sizing conductors, more is involved than just looking at Table 310.15(B)(16) in the National Electrical Code (NEC) and selecting a copper or aluminum conductor with the right ampacity. Of all the tables in Article 310, Table 310.15(B)(16) is referenced the most. READ MORE
May 2012
As stated in 90.1(A) of the National Electrical Code (NEC), the purpose of the Code is the practical safeguarding of people and property from hazards arising from the use of electricity. Because improperly sized conductors can create electrical hazards, it is crucial to understand how to select the correct size conductor. READ MORE
April 2012
One of the most-referenced tables in the National Electrical Code (NEC) is Table 310.15(B)(16), formerly Table 310.16. It contains allowable ampacities of insulated copper and aluminum (or copper-clad aluminum) conductors rated up to and including 2,000 volts (V). The temperature ratings of conductors include 60°C (140°F), 75°C (167°F) and 90°C (194°F). READ MORE
March 2012
Selecting the correct size conductor is not a difficult task, but there is more to it than just picking a conductor from Table 310.15(B)(16) in the National Electrical Code (NEC). The conductor must be selected and installed in accordance with all applicable provisions pertaining to conductors. READ MORE
February 2012
When sizing conductors, the number of current-carrying conductors installed in a raceway or cable must be considered. No conductor shall be used in such a manner that its operating temperature exceeds that which is designated for the type of insulated conductor involved [310.15(A)(3)]. READ MORE
January 2012
Table 310.15(B)(16) (formerly Table 310.16) in the National Electrical Code (NEC) provides allowable (or maximum) ampacities for insulated conductors rated up to and including 2,000 volts (V). The allowable ampacities in this table are based on two stipulations: adjacent load-carrying (current-carrying) conductors and ambient temperature. READ MORE
December 2011
Allowable ampacities for insulated conductors rated up to and including 2,000 volts (V) are in Table 310.15(B)(16). This table underwent a number change in the 2011 edition of the National Electrical Code (NEC). Before, this table was numbered 310.16. READ MORE

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