Electrical Metallic Tubing
( E M T )
 
  Galvanized Rigid Steel
Conduit ( R S C )
 
  Intermediate Metal
Conduit ( I M C )
 
  Fittings & Couplings
( F C )
   


*General

C80.3 - American National Standards; Institute; UL 797 - Underwriters Laboratories Standard; Article 348 - National Electric Code; WW-C-563A - Federal Specification
The above specs may still be referenced, however the federal government has canceled it and has adopted the UL 797 and ANSI C80.3 standards.

*Application

Galvanized Steel Electrical Metallic Tubing, National Electrical Code (NEC)® 2002 Article 358, can be installed indoors or outdoors, exposed or concealed, in all kinds of atmospheric conditions, and in hazardous locations, when in accordance with NEC® 502.4, 503.3 and 504.20 and providing it is not subject to sever physical damage during and after installation and is properly protected against corrosion.
Our EMT is manufactured from high-grade flat-rolled steel. Produced by the electric resistance welding process, the finished tube is uniform in OD size, wall thickness, a defect free interior surface and smoothly welded seams.

The 1/2''-1 1/2'' EMT are made from zinc coils. The 2''-4'' EMT are produced using an inline galvanizing process. The surface of all of them is thoroughly coated zinc, so that metal to metal contact and galvanic protection against corrosion are provided. Additionally, the exterior is protected by a clear zinc chromate coating. The good interior surface quality provides smooth continuous raceways for easy and fast wiring pulling. Its excellent ductility provides easy bending, cutting and joining while resisting flattening, kinking and splitting, creating smooth, continuous raceways for fast wire pulling to prevent waste of time and materials.

* Specification
 
EMT shall be mild steel, electrically welded, galvanized, and produced to the following specification:

Electrical Metallic Tubing (EMT) - Weights and Dimensions

All sizes furnished in 10' lengths. 20' lengths are available too.
Length = ¡À1/4''(¡À6.35mm).
Outside Diameter:
For trade sizes through 2: ¡À0.005 (¡À0.13mm)
For trade sizes 2-1/2: ¡À0.010 (¡À0.25mm)
For trade sizes 3: ¡À0.015 (¡À0.38mm)
For trade sizes 3-1/2 and 4: ¡À0.020 (¡À0.51mm)