Abstract
Sealing fittings in a conduit are only required in Class II hazardous locations, if the conduit enters a dust-ignition proof enclosure that is connected to a non dust-ignition proof enclosure, to prevent dust from entering the dust-ignition proof enclosure. This can be achieved by suitable means— such as, sufficient conduit length, or seals or other means of protection. For instance, when a conduit is entering the dust-ignition proof enclosure from the top, the entrance of dust can be prevented with a sealing fitting. However, when the conduit is entering from the side, it must be at least 10 feet. The 5 feet and 10 feet requirements are based on the traveling capability of dust in conduits. Unions, boxes, condoles, etc. in the 5 feet or 10 feet length of conduit are considered to reduce the safe length of the 5 feet and 10 feet. The purpose of condulets and small boxes is to have access to the conduit system. If they are opened during inspection or maintenance, the cover plates of the condulets and small boxes may not be reinstalled properly. Therefore, no condulets, boxes, unions, or other similar fittings should be allowed in the 5 feet and 10 feet safe conduit runs.
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