National Electrical Installation Standards

Standards as High as Your Own

Friday, March 17, 2017


Re: CQD answer published Friday, March 10, 2017 -Barn Feeder

Charlie, in the question about the barn supplied by a feeder you said that two ground rods are needed unless the 25 ohm rule is met. Is that enough or are other electrodes required.

Thank you, Taylor



Hey Taylor thanks for your follow up question. Buildings and structures supplied by feeders must have a grounding electrode system that complies with Part III of Article 250 as stated in 250.32(A). Any and all of the grounding electrodes in 250.52(A)(1) through (A)(7) that exist must be bonded together and used as the grounding electrode system as stated in 250.50. If no grounding electrodes exist then one or more of the ones in 250.52(A)(4) through (A)(8) must be installed such as two ground rods or a single ground rod that meets the 25 ohm resistance value.


Leave a comment
  1. jennifer | Mar 29, 2017

    Hi I think you did not understand the exact values of the two rods which should be used for feeder. You must know that the electrodes should same of 25ohms each. For better clarity I ask you look into   top writing service blog where you can get tutorial on this topic which will be very much helpful to you.

  2. Jasmine Power | Mar 22, 2017
    An electrode with an invariant potential. In electrochemical techniques, where it is important to watch, measure, or control the capability of another electrode (meant pointer, test, or working electrode), it is important to utilize a reference terminal, Essay writing service which keeps up a potential that remaining parts essentially unaltered over the span of an electrochemical estimation. Possibilities of marker or working terminals are measured or communicated with respect to reference electrode. One such electrode, the ordinary hydrogen electrode, has been picked as a kind of perspective standard, in respect to which possibilities of different electrodes and those of oxidation-decrease couples are regularly communicated. By keeping up a consistent weight of hydrogen gas the capability of a hydrogen electrode can be utilized for assurance of the movement of hydrogen particles in the tried arrangement.
  3. Philip Alderson | Mar 20, 2017
    The GT made a name for itself in the 1960s, and the nameplate returned to Ford for the 2005 and 2006 models. Since then, the vehicle has truly evolved into a supercar, evident by it’s $100,000+ price tag.The company has made some changes to the third-generation GT, prioritizing handling and track capabilities in their 2017 model. The result? Not only one of Ford’s most impressive cars ever, but perhaps one of the most innovative cars to ever be released.For more information about the 2017 Ford GT Release Date checkout.
  4. sign in | Mar 18, 2017 Sign in using an iPhone or iPad, you can access all the functions of including a very important feature ‘find my iPhone’ that helps an individual look for their lost or misplaced devices, even if their battery is dead

    Leave a comment

    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 for more information. NEISÔ 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 to view or purchase NECA safety products.

     CONTACT US: To submit a Code question, subscribe, or unsubscribe from this list, please e-mail: