Standards as High as Your Own
NECA Online Help Desk Please leave a message
Pursuant to the current NEC, what size breaker and gauge wire are needed for a 50 foot run for a 14.5kw range being installed in a home?
Hey Jeff thanks for your questions. Note 4 to Table 220.55 allows Table 220.55 to be used for determining the load of a single household range. Note 1 to that table requires the values in Column C to be increased by 5 % for each kW or major fraction thereof for ranges above 12kW.
Your example of a 14.5 kW range would be 14.5 - 12 kW = 2.5 kW (rounded up to 3) results in 3 X 5% or 15 % is added to the column C value. 8 kW plus 1.2 kW (15% X 8kW) = 9.2 kW.
9.2 kW x 1000 = 9200 divided by 240 volts = 38.33 amperes. Based on termination ratings of 60 degrees C (110.14(C)) using Table 310.15(B)(16) the minimum conductor size is 8AWG copper or 6 AWG aluminum in the 60 degree columns.
ABOUT CQD: NECA’s Code Question of the Day (CQD) is a leading National Electrical Code® forum for NECA and the industry. The CQD generates a lively dialogue and relative practical and Code-based responses to an ever-increasing and interactive audience.
IMPORTANT NOTICE: All answers are based on the latest edition of the National Electrical Code®, unless the question requests a response based on a specific edition. This correspondence is not a formal interpretation of the NEC®. Any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, or any technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services.
ABOUT CHARLIE: Charles M. Trout, better known as Charlie, was a nationally known NEC® expert and author. He served on several NEC® technical committees and is past chairman of CMP-12. In 2006 Charlie was awarded the prestigious Coggeshall Award for outstanding contributions to the electrical contracting industry, codes and standards development, and technical training. Charlie was also a member of NECA’s Academy of Electrical Contracting. Charlie’s experienced team of industry experts keep the CQD dialogue and discussions active and informative in the spirit of the man himself, as he wanted.
NECA STANDARDS: NECA publishes the National Electrical Installation Standards™ (NEIS™), a series of ANSI-approved performance and quality standards for electrical construction. Visit NECA-NEIS.org for more information. NEISÃ” can be purchased in three formats: as paper books, on CD, or as electronic downloads.
NECA SAFETY PRODUCTS: NECA publishes valuable electrical safety books and CDs for the industry. Visit necanet.org/store to view or purchase NECA safety products.
CONTACT US: To submit a Code question, subscribe, or unsubscribe from this list, please e-mail: email@example.com.
© 1999 – 2014 National Electrical Installation Standards. All rights reserved.
Brought to you by NECA. NECA is the voice of the electrical contracting industry NATIONAL ELECTRICAL INSTALLATION STANDARDS, NEIS and the NEIS logo are registered trademarks of the National Electrical Contractors Association.
Created by Matrix Group International, Inc.