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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.
© Hughes Associates,Inc. 2012