EMT

I believe you will find EMT raintight fittings are far more expensive than standard compression fittings. You can search "raintight" on the Forum and find much discussion on the topic
 
There is no provision in UL 797, the product standard for EMT, for hot dipped EMT. The provision is for a zinc coating which is not close to being the same as hot dipped.
 
The Allied EMT that is mentioned in the spec uses "hot galvanized Flo-Coat™ process". Is that a form of hot dipping?

EZ-Pull® EMT​

EZ-Pull® EMT is a line of high-quality electrical metallic tubing with the E-Z Pull® interior coating. Our hot galvanized steel uses a patented inline Flo-Coat™ process for long lasting exterior protection.

Features:​

  • E-Z Pull® interior coating provides a smooth surface for faster wire pulling
  • Excellent mechanical protection for conductors
  • Ductile steel for faster and easier bending
  • High grade mild strip steel for durability and longer life
  • Listed to Underwriters Laboratories Safety Standard UL 797
  • Manufactured in accordance with ANSI C80.3
  • Available in 45°, 90°, and Large Radius 90° Elbows
  • Available in trade sizes ½" (16mm) – 4" (103mm)
  • Environmental Product Declaration (EPD) Available
Click to expand...
 
don_resqcapt19 said:
I don't know. Real hot-dipped is never smooth like the surface of EMT is
Click to expand...
Here is a link that covers the different processes, confirming what Don said about the roughness of hot dipped.
mlpiping.com

Hot Galvanized vs Hot Dipped Galvanized: A Beginner’s Guide - Metleader

In the metal protection area, galvanization is a commonly used to prevent rust or corrosion. Beginners are often confuse two galvanizing processes, which are hot galvanized and hot dipped galvanized.
mlpiping.com
 
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