Section 505.7(A) requires that the "classification of areas, engineering and design, and selection of equipment and wiring methods, installation, and inspection shall be preformed by qualified Qualified is intended to mean experienced and competent in area classification by zone and in wiring and protection methods in zone-classified areas. The qualified person is not necessarily required to be an electrical engineer. For example, a process engineer, a chemical engineer, or perhaps a fire-protection engineer, even someone who is not an engineer, may be experienced and qualified to do area classification and select methods without necessarily being qualified to do the design of the electrical distribution or circuitry. persons."

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