In a Class III, Division 1 location, where ignitable fibers or flyings are present in the air in quantities sufficient to produce ignitable mixtures, what is the minimum required conduit seal-off fitting requirement for a conduit entering an enclosure containing arcing or high-temperature devices, according to NEC 2026?
Seals are required in all conduits entering enclosures containing arcing or high-temperature devices.
Seals are not generally required in Class III locations, unless specified for specific equipment.
Seals are only required if the conduit contains intrinsically safe wiring.
Seals are required only if the enclosure is also located in a Class I area.
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