Code Hunter — Clearance (2017 NEC)


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. For battery racks, there shall be a minimum clearance of __________ between a cell container and any wall or structure on the side not requiring access for maintenance.
2. Overhead service conductors, where not in excess of 600 volts, nominal, shall have the following minimum clearance from final grade:
3. Electrical equipment provided with _________ openings shall be installed so that walls or other obstructions do not prevent the free circulation of air through the equipment.
4. Overhead spans of _________ conductors and _________ multiconductor cables shall have a vertical clearance of not less than 2.7 m (8 ft 6 in.) above the roof surface.
5. Boxes that enclose devices or utilization equipment that projects more than __________ rearward from the mounting plane of the box shall have a depth that is not less than the depth of the equipment plus 6 mm (¼ in.).
6. For other than a totally enclosed switchboard or switchgear, a space not less than __________ shall be provided between the top of the switchboard or switchgear and any combustible ceiling, unless a noncombustible shield is provided between the switchboard or switchgear and the ceiling.
7. Luminaires installed in exposed or concealed locations under metal-corrugated sheet roof decking shall be installed and supported so there is not less than 38 mm (1 ½ in.) measured from the __________ of the roof decking to the top of the luminaire.
8. In a concealed knob-and-tube wiring system, a minimum clearance of 3 inches must be maintained between conductors.
9. Transformers with ventilating openings are required to be installed so that the openings are not blocked by walls or other obstructions.
10. Wiring located above heated ceilings shall be spaced not less than 100 mm (4 in.) above the heated ceiling.


Bonus Question

[mlw_quizmaster quiz=7]

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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.