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

Zone Classification

Seals in Zone-Classified Areas


The purpose of seals and the sealing requirements for zone-classified areas are very similar to the requirements for division-classified areas. There are a few significant differences, however. For example, since only intrinsically safe circuits and equipment are permitted in Class I, Zone 0 areas, the seals that are required to limit gas or vapor movement to other areas are not required to be flameproof or explosionproof not required to be flameproof or explosionproof:
The intrinsically safe circuit is not capable of igniting the explosive atmosphere, so there is no need for the seals to be capable of halting flames or explosions. They must, however minimize the flow of gas or vapor across the seal.. Also, flameproof or increased safety enclosures must be sealed if conduit is used, but where cable is used seals are not required at increased safety equipment. The cable and conduit seals that may be used and the installation requirements installation requirements:
For example, thickness of seals must be as shown in the diagram, no splices or taps are permitted in the seals, and conductor fill at the seal is limited to 25 percent. for the seals are the same as those used for division-classified areas, but the fittings must be listed for the specific location.

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

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