Article 503 covers requirements for electrical equipment and wiring in Class III locations due to ignitible what?

Article 503 specifically addresses locations classified as Class III, which are environments where ignitible fibers or flyings may be present. These locations are often found in industries like textiles, wood processing, and agriculture, where materials such as dust or shredded materials can create hazardous conditions when combined with electrical equipment and wiring.

Understanding this classification is crucial for ensuring safety in environments where these materials might accumulate. Proper installation and equipment choice can significantly reduce the risk of ignition that could lead to fire or explosion.

The other options do not apply to Class III locations. Gases and liquids are associated with Class I and Class II locations, respectively, while particulate matter refers to finer particles that may not necessarily be classified under the specific provisions of Article 503. This distinction underscores the importance of recognizing the nature of potential hazards in different classified locations when implementing safety measures.