National Electrical Installation Standards

Standards as High as Your Own

Wednesday, May 25, 2022



If a worker is installing medium voltage splices for a pad-mounted transformer, does he or she need to be qualified? How are qualifications determined?

Thanks for the help.

Mike Reed



Hello Mike,

Good question. The answer to the first part is yes. Sections 328.14 (2017 NEC) and 311.30 (2020 NEC) have a requirement that indicates Type MV cable shall be installed, terminated, and tested by qualified persons. There is also an informational note about accepted industry practices and installation procedures for medium-voltage cable are described in ANSI/NECA/NCSCB 600-2014, Standard for Installing and Maintaining Medium-Voltage Cable and in IEEE 576-2000, Recommended Practice for Installation, Termination, and Testing of Insulated Power Cables as Used in Industrial and Commercial Applications. The second part of the question is a bit more involved, but minimum qualifications are typically demonstrated by licensing or certification. Also good to remember that achieving minimum credentials does not necessarily mean a person is qualified. The other important aspects of qualifications are training and experience. Hope this is useful.

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