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Thread: Fiber optic cable in Class 1 Division 1 area

  1. #11
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    Re: Fiber optic cable in Class 1 Division 1 area

    from 2005 NEC
    514.8 Underground Wiring.
    Underground wiring shall be installed in threaded rigid metal conduit or threaded steel intermediate metal conduit. Any portion of electrical wiring that is below the surface of a Class I, Division 1, or a Class I, Division 2, location [as classified in Table 514.3(B)(1) and Table 514.3(B)(2)] shall be sealed within 3.05 m (10 ft) of the point of emergence above grade. Except for listed explosionproof reducers at the conduit seal, there shall be no union, coupling, box, or fitting between the conduit seal and the point of emergence above grade. Refer to Table 300.5.
    Exception No. 1: Type MI cable shall be permitted where it is installed in accordance with Article 332.
    Exception No. 2: Rigid nonmetallic conduit shall be permitted where buried under not less than 600 mm (2 ft) of cover. Where rigid nonmetallic conduit is used, threaded rigid metal conduit or threaded steel intermediate metal conduit shall be used for the last 600 mm (2 ft) of the underground run to emergence or to the point of connection to the aboveground raceway, and an equipment grounding conductor shall be included to provide electrical continuity of the raceway system and for grounding of non–current-carrying metal parts.

  2. #12
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    Re: Fiber optic cable in Class 1 Division 1 area

    "I don’t know what the alphanumeric “08956M” means"


    Just a guess, but maybe it's a sequential length marking in meters? ie 8,956 meters... That would be a large spool of cable, but given the range of fiber optics, it's possible.

  3. #13
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    Re: Fiber optic cable in Class 1 Division 1 area

    the numbers on the cable may be the type of cable also. Was a manufacturer listed on outside of cable also - if yes call manufacturer and find out what numbers indicate

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