National Electrical Installation Standards

Standards as High as Your Own

Tuesday, November 19, 2019


Outside at weather heads I typically see what is called an H-tap type of splice, where conductor transition from overhead outside wiring to a raceway or other chapter 3 wiring methods. I've been looking for a code rule that allows this type of splice without using a junction box, can you help me out Charlie? Thanks in advance for what you do each day.

Chloe R.


Hey Chloe thanks for your question. Typically, the overhead conductors supplying buildings are messenger-supported wiring such as triplex or quadruplex as defined in 396.2. Conductor splices and taps are allowed if made by approved methods as stated in 396.56.

If the overhead conductors are service drop conductors as the term Service Drop is defined in Article 100 they are owned by the utility and the NEC does not apply as stated in 90.2(B)(5).

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CHARLIE TROUT: 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. Even though Charlie passed away in October of 2015, his work continues in spirit. NECA continues to maintain this question forum for its many subscribers in memory and recognition of all his significant contributions to making the NEC what it is today.

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