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

Zone Classification

Cables in Conduit

Sealing requirements for cables in conduit depend on whether or not the cables are "gas-blocked," that is, whether or not they will allow gas or vapor to be transmitted through the interior spaces in the cables. Cables that are gas-blocked are allowed to be treated as individual conductors within the conduit and sealing fittings, which means the outer jacket need not be removed for sealing.

Generally, cables that are not gas-blocked (that are capable of transmitting gas or vapor) are required to have the outer jacket removed so the sealing compound can surround the individual conductors to seal the entire cable assembly. Where shielded cables or twisted-pair cables are used, removing the jacket and shield or separating the twisted pairs could destroy the function of the cables. In such cases, the shield or twisted pairs may be left intact if the cable ends are sealed to minimize the entrance of gas or vapor into the cable core.

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

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