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Conduits Sizes

Electrical conduits trade sizes and max distance between supports

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Conduit Trade Size
(in)
Inside DiameterMax Distance Between Supports
Rigid Metal (PVC)
(ft, (m))
(inches)(mm)
1/2 0.622 15.8 10 (3)
3/4 0.824 20.9 10 (3)
1 1.049 26.6 12 (3)
1 1/4 1.380 35 14 (5)
1 1/2 1.610 40.9 14 (5)
2 2.067 52.5 16 (5)
2 1/2 2.469 62.7 16 (6)
3 3.068 77.9 20 (6)
3 1/2 3.548 90.1 20 (7)
4 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

According "National Electric Code (US NEC or NFPA 70) Section 344 for Rigid Metal Conduit":

  • 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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