1. Class I, Division 1
What characterizes Class I, Division 1 hazardous locations according to NEC and CEC?
Explanation: Class I, Division 1 locations are hazardous due to the continuous presence of flammable gases or vapors in sufficient quantities to produce an ignitable mixture.
2. Class II, Division 1
What defines Class II, Division 1 hazardous locations according to NEC and CEC?
Explanation: Class II, Division 1 locations are hazardous due to the presence of combustible dusts in sufficient quantities to produce an ignitable mixture.
3. Class III, Division 1
What characterizes Class III, Division 1 hazardous locations according to NEC and CEC?
Explanation: Class III, Division 1 locations are hazardous due to the presence of easily ignitable fibers produced during the processing of materials such as textiles.
4. Class I, Division 2
What defines Class I, Division 2 hazardous locations according to NEC and CEC?
Explanation: Class I, Division 2 locations are hazardous due to the presence of flammable gases or vapors that may frequently exist due to leakage or maintenance repair.
5. Class II, Division 2 (Confined Spaces)
What characterizes Class II, Division 2 hazardous locations in confined spaces according to NEC and CEC?
Explanation: Class II, Division 2 locations in confined spaces are not normally hazardous but may become hazardous due to the presence of combustible dusts in sufficient quantities.
6. Group F Atmosphere
Which material is associated with Group F atmospheric mixtures according to NEC and CEC?
Explanation: Group F atmospheric mixtures include carbon black and coal dust.
7. Additional Resources
Where can you find more information on the NEC and CEC classification of hazardous locations?
Explanation: For more information on the NEC and CEC classification of hazardous locations, you can refer to the National Electrical Code website and the Canadian Electrical Code website.
Short Article on Classification of Hazardous Locations
Classification of Hazardous Locations
National Electrical Code (NEC) and the Canadian Electrical Code (CEC) classification of hazardous locations:
Class I Locations
- Class I, Division 1: These locations are hazardous due to the presence of flammable gases or vapors that are continuously, intermittently, or periodically present in sufficient quantities to produce an ignitable mixture.
- Class I, Division 2: These locations are hazardous due to the presence of flammable gases or vapors that may frequently exist due to leakage or maintenance repair.
- Class I, Division 3: These locations are hazardous due to the breakdown of equipment that may release concentrations of flammable gases or vapors that could cause simultaneous failure of electrical equipment.
Class II Locations
- Class II, Division 1: These locations are hazardous due to the presence of combustible dusts that are suspended in the air in sufficient quantities to produce an ignitable mixture.
- Class II, Division 2: These locations are hazardous due to the presence of combustible dusts that may be present in dangerous quantities in confined spaces or during abnormal operations.
- Class II, Division 2: These locations are not normally hazardous, but may become hazardous due to the accumulation of dust during normal operations.
Class III Locations
- Class III, Division 1: These locations are hazardous due to the presence of easily ignitable fibers or flyings that are produced during the processing of materials such as textiles.
- Class III, Division 2: These locations are hazardous due to the presence of easily ignitable fibers or flyings that may accumulate in quantities sufficient to produce an ignitable mixture.
Atmospheric Mixtures
For purposes of testing, classification, and approval of electrical equipment, atmospheric mixtures are classified into seven groups (A through G) depending on the kind of material involved. The following is a table of the atmospheric mixture groups:
| Group | Material |
|---|---|
| A | Hydrogen |
| B | Gasoline, hexane, naphtha |
| C | Ethanol, methanol |
| D | Methane, propane |
| E | Metal dust |
| F | Carbon black, coal dust |
| G | Grain dust, sugar dust |
Additional Information
For more information on the NEC and CEC classification of hazardous locations, please refer to the following resources:
- National Electrical Code: https://www.nfpa.org/codes-and-standards/7/0/nfpa-70
- Canadian Electrical Code: https://www.csagroup.org/store/canadian-electrical-code-products/
You can also contact Harrington’s Technical Services department for assistance with testing, classification, and approval of electrical equipment.
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