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NOTE: This is an unformatted excerpt from our online fire protection training library.

Zone Classification

Seals in Zone-Classified Areas

Enclosure Seals - Conduits

Because the only protection method permitted in Zone 0 areas is intrinsic safety, enclosures in such areas are not required to be sealed. In Zone 1 and 2 areas, seals are required at enclosures where the protection method used is flameproof flameproof:
Seals are not required if the flameproof enclosure is marked to indicate that a seal is not required (factory sealed). or encapsulation encapsulation:
Seals are required to complete the encapsulation where the enclosure is penetrated by a conduit.
. Seals are also required required:
In Zone 1 areas, seals are required where flameproof or encapsulated equipment is used in order to complete the enclosures, but in Zone 2 areas the seals are required only where equipment is required to be flameproof or explosionproof (it is required to be flameproof or explosionproof if it contains ignition sources). where explosionproof equipment explosionproof equipment:
According to Section 505.20, explosionproof equipment (equipment identified for use in Class I, Division 1 or 2 areas) is permitted in lieu of equipment identified for Zone use. is used. In addition, conduits must be sealed if they are trade size 2 or larger and they enter explosionproof enclosures that contain terminals, splices, or tapscontain terminals, splices, or taps:
These would not normally be ignition sources, but the larger conduits must be sealed to reduce the possible effects of pressure piling.. Seals must also be provided for conduit entries to pressurized enclosures if the conduit is not included in the pressurized protection system. Generally, the seal should be as close as possible close as possible:
For explosionproof enclosures, the seal must be within 18 inches of the enclosure. to the enclosure.

Special Cases
NOTE: This is an unformatted excerpt from our online fire protection training library.

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