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
Christel Hunter is vice president of engineering for Cerro Wire. Chris is a senior associate member of IAEI and 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 Certified Standards Professional, Master Electrician, and LEED Accredited Professional.