Max number of conductors in 3/8 FMC

Discussion in 'Electrical Forum discussion & Blog' started by WorthFlorida, Oct 19, 2016.

  1. WorthFlorida

    WorthFlorida The wife is still training me.

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    I'm doing wiring job in my garage to add one outlet for a refrigerator (17 Cu Ft) and a ceiling outlet for 2 LED shop lights at 35 watts each. Today, I ran 4 conductors (THHN) inside a 3/8" FMC and it was quite a chore. One of each, Grn, Wht, Blk, Red. The FMC is only about 6 ft long from a wire mold channel to a 4" octagon juncture box. The refrigerator will be on its own 15 amp breaker (red wire) and the ceiling outlet (about 9 ft off the garage floor) will be a switch circuit from a recently added breaker for extra outlets over the work bench.

    Question: The chart below reads 3 or 4 conductors depending on internal or external connectors. What is defined as internal or external connectors?


    upload_2016-10-19_22-17-58.png
     
  2. Stuff

    Stuff Well-Known Member

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    Pennsylvania
    Never dealt with that as always have MC cable but guess is internal connector is one of those that screws into the end of the FMC. External would be normal clamp type connector.
     
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  4. WorthFlorida

    WorthFlorida The wife is still training me.

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    Location:
    Orlando, Florida
    My assumption is these are external connectors and internal would be the clamp type inside electrical boxes? I used the one on the left side of the image.

    Connectors.png
     
  5. Reach4

    Reach4 Well-Known Member

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  6. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    Got it. Never seen that type of internal connector. Thanks
     
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