Wiring – n advantage to using EMT over Plastic Flexible Conduit for Low Voltage runs

low-voltagewiring

I am planning a structured wiring project. As AV wiring is always changing, I think it would be pertinent to run the low voltage wire in conduit. While discussing the idea with a friend (and hardware store salesmen), he told me that in his personal project he installed all the low voltage in standard EMT.

To me, this seems like a bit of overkill. Working with EMT in a crawlspace doesn't seem fun, and for pulling AV cable, it seems like the sharp bends might actually be harder to work with. Then again, "smurf tube" has ribbing inside that could also cause snags.

So, is there any advantage to using EMT instead of flexible conduit (Carlon, smurf tube, etc) for running low voltage structured wiring runs?

Best Answer

Electrical Metallic Tubing (Type EMT)

Pros

  • Protection from physical damage
  • Larger internal area (1/2" EMT = 0.622 in. ID)
  • Available in sizes over 2"
  • Easy to push through closed walls and bored holes.
  • Can be used as equipment grounding conductor

Cons

  • Requires fittings
  • Costs slightly more ($0.256/ft.)
  • More difficult to cut
  • More difficult to bend

Electrical Nonmetallic Tubing (Type ENT)

Pros

  • Easy to cut
  • Easy to bend
  • Long runs without fittings
  • Slightly cheaper ($0.24/ft.)

Cons

  • More difficult to pull through closed walls and bored holes
  • Only available in sizes 1/2" to 2"
  • Smaller internal area (1/2" ENT = 0.560 in. ID)
  • Releases toxic fumes when burned
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