Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Electrical Metal Tubing (EMT) - Conduits

Trade sizes and max. distance between conduit supports.

Sponsored Links

Electrical Metallic Tubing (EMT) - Thinwall Conduit

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

Electrical Metal Tubing (EMT) - Conduits
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 to 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
Sponsored Links

Related Topics

  • Electrical

    Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.

Related Documents

Sponsored Links

Search

Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

Citation

This page can be cited as

  • The Engineering ToolBox (2010). Electrical Metal Tubing (EMT) - Conduits. [online] Available at: https://www.engineeringtoolbox.com/conduit-size-d_1738.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter

















































2.19.10

Sponsored Links
.