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    Fiber optic cable in Class 1 Division 1 area

    [ January 19, 2005, 04:38 PM: Message edited by: rbalex ]

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

    I think that is a stretch. Possible if the fiber has a metalic stregnth member, shield, or locating wire built into it. Sorry do not know any specific NEC rule.

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

      I ran into this one time. It seems there is some concern that vapors might be transmitted from a hazardous area to a non-hazradous area through the sheath.

      I seem to recall that you can get FO cable that is made so vapors cannot be transmitted in this way.
      Bob

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        #4
        Re: Fiber optic cable in Class 1 Division 1 area

        500.8(E) Fiber Optic Cable Assembly. Where a fiber optic cable assembly contains conductors that are capable of carrying current, the fiber optic cable assembly shall be installed in accordance with the requirements of Articles 500, 501, 502, or 503, as applicable.
        Above is the "basic" rule. Table 770.53 lists cables suitable for classified locations.

        The contractor is probably referring to 514.8; however, there are still too many open questions in your description to give a more definitive response. Ask the contractor what the specific violation is.
        [COLOR=black]"Bob"[/COLOR]
        Robert B. Alexander, P.E.
        Answers based on 2017 NEC unless otherwise noted.

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          #5

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            #6
            Re: Fiber optic cable in Class 1 Division 1 area

            Steve, if he is concerned about fiber optic cable, then why wouldn't he be concerned about the interstices in the power conductors?
            Charlie Eldridge, Indianapolis, Utility Power Guy[COLOR=red][/COLOR]

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              #7
              Re: Fiber optic cable in Class 1 Division 1 area

              Originally posted by charlie:
              Steve, if he is concerned about fiber optic cable, then why wouldn't he be concerned about the interstices in the power conductors?
              In theory he should be - see my favorite FPN (not) :
              501.5...FPN No. 2: Gas or vapor leakage and propagation of flames may occur through the interstices between the strands of standard stranded conductors larger than 2 AWG. Special conductor constructions, for example, compacted strands or sealing of the individual strands, are means of reducing leakage and preventing the propagation of flames.
              [COLOR=black]"Bob"[/COLOR]
              Robert B. Alexander, P.E.
              Answers based on 2017 NEC unless otherwise noted.

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                #8
                Re: Fiber optic cable in Class 1 Division 1 area

                Bob, how do address the second sentence in 514.8?
                Charlie Eldridge, Indianapolis, Utility Power Guy[COLOR=red][/COLOR]

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                  #9
                  Re: Fiber optic cable in Class 1 Division 1 area

                  Originally posted by charlie:
                  ...Bob, how do [you] address the second sentence in 514.8?
                  [COLOR=black]"Bob"[/COLOR]
                  Robert B. Alexander, P.E.
                  Answers based on 2017 NEC unless otherwise noted.

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                    #10
                    Re: Fiber optic cable in Class 1 Division 1 area

                    Bob, you write such good essays.
                    Charlie Eldridge, Indianapolis, Utility Power Guy[COLOR=red][/COLOR]

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

                      from 2005 NEC

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                        #12

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                          #13
                          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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