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Electrical Metal Tubing - EMT - Conduits

Electrical Metal Tubing (EMT) conduits trade sizes and max distance between supports

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Electrical Metallic Tubing(EMT) - Thinwall Conduit

Electrical Metallic Tubing (EMT) is unthreaded with circular cross section dimensions:

Conduit Trade SizeOutside DiameterInside DiameterMax Distance Between Supports
Rigid Metal (PVC)
(in)(mm)(in)(mm)(in)(mm)(ft)(m)
1/2 16 0.706 17.9 0.622 15.8 10 3
3/4 21 0.922 23.4 0.824 20.9 10 3
1 27 1.163 29.5 1.049 26.6 12 3
1 1/4 35 1.510 38.4 1.380 35 14 5
1 1/2 41 1.740 44.2 1.610 40.9 14 5
2 53 2.197 55.8 2.067 52.5 16 5
2 1/2 63 2.875 73.0 2.469 62.7 16 6
3 78 3.500 88.9 3.068 77.9 20 6
3 1/2 91 4.000 101.6 3.548 90.1 20 7
4 103 4.500 114.3 4.026 102.3 20 7
5 5.047 128.2 20 7
6 6.093 154.8 20 8
  • 1 inch = 25.4 mm
  • 1 ft (foot) = 0.3048 m

The outside tube is galvanized for corrosion protection and the inside has corrosion-resistant coating.

According National Electric Code (US NEC or NFPA 70) Article 344 for Rigid Metal Conduit and Article 358 Electrical Metallic Tubing.

  • a conduit must be supported at intervals no longer than 3 m (10 ft) and fastened not more than 0.9 m (3 ft) from a box, fitting, etc.
  • the distance between supports for straight runs of conduit shall be permitted in accordance to the table above provided the conduit is made up with threaded couplings and such supports prevent transmission of stresses to termination where conduit is deflected between supports

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