Code Hunter — Corrosion, NEC-2017


To play this game, you need a sharp eye, a quick mind, and a 2017 National Electrical Code book.

(Fill-in-the-blank questions are looking for the exact words) used in the NEC).

1. Internal parts of electrical equipment, including busbars, wiring terminals, insulators, and other surfaces, shall not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or____________________.
2. One type of enclosure permitted for use in outdoor corrosive environments is:
3. The grounding electrode conductor shall be of copper, aluminum, copper-clad aluminum, or the items permitted in 250.68(C).  The material selected shall be resistant to any ____________ condition existing at the installation or shall be protected against corrosion.
4. Type AC cable shall not be used as follows:

Ventilating pipes for motors, generators, or other rotating electrical machinery, or for enclosures for electrical equipment, shall be of metal not less than 0.53 mm (0.021 in.) in thickness or of equally substantial noncombustible material and shall comply with which one of the following:

6. Rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride conduit and reinforced thermosetting resin conduit shall be considered to be resistant to the corrosive environment specified in _________.
7. Grounding and bonding terminals shall be __________ for use in wet and corrosive environments.
8. Backfill that contains large rocks, paving materials, cinders, large or sharply angular substances, or corrosive material shall not be placed in an excavation where materials may damage raceways, cables, conductors, or other structures or prevent adequate compaction of fill or contribute to corrosion of raceways, cables, or other substructures.
9. Ferrous raceways and fittings protected from corrosion solely by galvanization shall be permitted only indoors and in occupancies not subject to severe corrosive influences.
10. Motors and other rotating electrical machinery shall be totally enclosed or designed so as to minimize the entrance of dust, moisture or insects.

Bonus Question

Aluminum EMT shall be provided with approved supplementary corrosion protection where encased in concrete or in direct contact with the earth.


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Christel Hunter is director of codes and standards for Cerro Wire. Chris is a senior associate member of IAEI and serves as a board member for the Southern Nevada Chapter of IAEI and the Las Vegas Section of IEEE. Chris also serves on NEC CMP-6 and CMP-7, the CE Code Part I committee and Sections 4 and 12 subcommittees, and many other industry committees. She is a certified standards professional, master electrician, and LEED accredited professional. Randy Hunter has over thirty years’ experience in the electrical industry including working in the government, contracting and manufacturing sectors. He is an instructor and consultant specializing in electrical code and installations, and co-owner of Hunter Technical Services. He holds twelve inspections certifications from IAEI, ICC and IAPMO. He is the IAEI Southwestern Section secretary, Southern Nevada IAEI Chapter president, former principal member on NEC CMP-6 and CMP-17, voting member of UL 1563 (Electric Spas, Equipment Assemblies, and Associated Equipment), and a former member of the IAPMO Product Certification Committee and Standards Review Committee. Randy has served on several Southern Nevada local code committees and electrical licensing committees and has been a master electrician since 1988. Prior to that, he designed and built computer numerically controlled (CNC) machine tools.