Hazardous (Classified) Locations, 2023 NEC

Code Hunter
Code Hunter

To play this game, you need a sharp eye, a quick mind and a 2023 National Electrical Code book. The NEC can be accessed for free at nfpa.org/70. (Fill-in-the-blank questions are looking for the exact word(s) used in the NEC.)

1. A location where ignitible concentrations of flammable gases exist under normal operating conditions is a __________ location.


2. Equipment listed and marked for use in Zone 0 locations is permitted in a __________ location.


3. Article 512 convers cannabis oil preparatory equipment, extraction equipment, booths, and systems using __________ materials.


4. Which of these wiring methods are allowed in a Class II, Division 1 location?


5. Dusttight equipment is a protection technique allowed in _________ locations.


6. Protection techniques for hazardous (classified) locations can be found in Table __________ of Chapter 9.


7. At a motor fuel dispensing facility, a location may be unclassified if the AHJ can determine that liquids with a flash point lower than __________ will not be handled.


8. Any wiring method permitted in a(n) __________ location may be used for intrinsically safe apparatus.


9. In a Class I, Division 1 location, a conduit seal is required for an enclosure containing splices if the raceway entry it is trade size __________ or larger.


10. In Class III, Division 1 locations, Type MC cable is permitted if it uses __________ fittings.


11. For listed explosionproof equipment, joints with factory-threaded NPT entries must be made up with how threads fully engaged?


Christel Hunter and Randy Hunter
Christel Hunter is vice president of standards for Cerro Wire. Chris serves as President for the Southern Nevada Chapter of IAEI. Chris also serves on NEC CMP-6 and CMP-13, NFPA 921, NFPA 70B, NFPA 73 and UL STPs 62, 83, 719 and 4703. Chris is a Professional Safety and Health Officer, Certified Standards Professional, Master Electrician, and LEED Accredited Professional. Randy Hunter is an instructor and consultant specializing in electrical code and installations, and co-owner of Hunter Technical Services. He holds ten inspections certifications from IAEI and ICC. He has been a master electrician since 1988.