Hazardous Location Classification Guide
Class/Division, group, T-code, scenario, and source-boundary planning prompts for hazardous classified location review
Free hazardous location planning screen for electricians, plant engineers, and safety professionals who need a structured review prompt before the real classification work starts. Select the hazard type, material row or custom autoignition temperature, and Division basis to see local Class, Group, T-code, Zone-context, wiring-reminder, source-warning, and scenario outputs. Local material groups, AIT rows, scenario boundaries, and wiring rows are source-gap fixtures, not current NEC, NFPA 497, NFPA 499, API RP 500, API RP 505, equipment-listing, or AHJ proof.
Calculate conduit fill for hazardous location wiring
Conduit Fill Calculator →Size transformers for classified area power distribution
Transformer Sizing Calculator →Look up NEMA plug and receptacle configurations for hazloc equipment
NEMA Configuration Reference →How It Works
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Select Hazard Type
Choose from flammable gases and vapors (Class I), combustible dusts (Class II), or ignitable fibers and flyings (Class III).
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Identify the Material
Select a local material row or enter a custom autoignition temperature and group. Verify the row against current standards, SDS data, tested dust data, and project documents.
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Specify Hazard Frequency
Enter a Division 1 or Division 2 planning basis, then confirm the actual release grade, ventilation, process conditions, and area extent with qualified review.
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Review Source Boundaries
Review the local Class/Division/Group, Zone-context, T-code, and wiring-reminder screen with the warnings that keep it separate from a final classification study.