How is a wire gland used in conjunction with a steel pipe?
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For example, for a galvanized welded steel pipe of DN20, a tee wire-passing box is required; what specific specifications should this wire-passing box have? What size should the thread be? G1/2" or G3/4"?
The thread size should be G3/4". Galvanized welded steel pipes with DN20 can have ZG3/4\" tapered threads tapped on them, and G3/4\" and ZG3/4\" work very well together
You can make a choice based on the type of wire gland you have available; welded steel pipes can be fitted with 4-inch or 6-inch joints using welding.
G3/4”, for DN20 use a threading machine to thread G3/4” external threads； DN15 with G1/2. I suggest you go to the workshop to see the actual products, and then look up the relevant standards.
But I see on page 327 of Volume 2 of the installation manual HG/T21581-2010 for self-control systems, how is it determined that the dust-proof tee wiring box should be of G1/2" size? G3/4" should be the choice.
The 4th floor is correct. Could the person on the 5th floor share the new book they have?
This post was last edited by LEECO1981 on 2010-6-2 20:26. “For example, for a galvanized welded steel pipe of DN20, a tee wiring box is required; what specific specifications should this wiring box have?” What size should the thread be? G1/2" or G3/4"? ” Answer: Wire conduit with DN15 galvanized pipe and G1/2\" thread specification, or (other standards with similar sizes such as M15X1.5, etc.) ； Wire conduit for DN20 galvanized pipe with G3/4" thread specification ； Wire conduit with DN25 galvanized pipe and G1" thread specification ； And so on! Does the brother on the 5th floor have an electronic version of “HG/T21581-2010” (in CAD format)? Our company has just purchased the paper version; it’s okay for reference purposes, but if we need to use it for drawing, we have to draw it by hand, which is quite troublesome.