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From PDHengineer. com-Decatur Professional Development, LLC
Introduction to Area Classification
...erties) that may be present (i.e. acetylene vs. propane). Article 505 of the NEC is similar to Article 500, but it uses Zones instead of Divisions to designate the likelihood that a flammable substance may be present. Additionally, Article 505 uses different character designations (Roman numerals combined with alphabetic letters) for Groups relative to Article 500, which uses Alphabetic
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...erties) that may be present (i.e. acetylene vs. propane). Article 505 of the NEC is similar to Article 500, but it uses Zones instead of Divisions to designate the likelihood that a flammable substance may be present. Additionally, Article 505 uses different character designations (Roman numerals combined with alphabetic letters) for Groups relative to Article 500, which uses Alphabetic
more...
