Free Hazardous Location Tools
Interactive tools for engineers, facility managers, and procurement teams working with NEC hazardous location classifications and explosion-proof equipment. Everything here is free to use — no signup required.
Industrial Cooling Load Calculator
Calculate the cooling load (BTU/hr and tons) required for an industrial enclosure, control room, equipment shelter, or MCC building. Uses standard ASHRAE methodology with every calculation shown — engineers can verify the math step by step. Exportable to PDF, copyable, and shareable via URL.
- ASHRAE-standard heat transfer methodology
- 30+ US city design temperatures built in
- Transparent math — every formula and number shown
- Print to PDF, copy as report, or share by URL
Hazardous Location Classification Wizard
Don't know what classification your facility needs? Answer a few plain-English questions and this tool will identify the likely NEC Class, Division, and Group for the area you're trying to specify. Built for engineers AND non-engineers — every question explained, every result accompanied by reasoning.
- Determines Class, Division, and Group
- Plain-English explanations at every step
- Handles "I don't know" answers gracefully
- Surfaces ambiguity instead of hiding it
NEC 500 ↔ Zone Classification Converter
Translate hazardous location classifications between the US system (NEC Article 500 — Class/Division/Group) and the international Zone system (NEC 505 / IEC / ATEX / IECEx). Handles the edge cases — Division 1 mapping to Zone 0 OR 1, IEC Group IIC covering US Groups A AND B — that simple tables hide.
- Two-way translation between US and international
- Plain-English explanation of every marking
- Materials and example facilities for each combo
- Full reference tables for Class I, II, III
Need help specifying explosion-proof HVAC?
We design and modify explosion-proof air conditioning for every hazardous location classification. Most simple quotes back to you within 24–48 hours.