does anyone know the history of the 4 11/16 box

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i think its something like when nigel tufnel said, "these go to 11".


just needed a little bit more.
 
4-11/16" fits and maximizes the use of the space inside of a 6" steel I-beam column (4-3/4" wide at the base of the taper). You could run the conduit inside the I-beam and it would be more protected in a factory environment, so they made a j-box size that fit inside too. It probably ended up in commercial and residential use simply because it had, as Ahnold Gropenator once said (in a commercial for jeans), "a schoach more room".
 
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4-11/16" fits and maximizes the use of the space inside of a 6" steel I-beam column (4-3/4" wide at the base of the taper).
I don't know if that's true, but it sure sounds plausible.





Why couldn't they have made it rectangular?
 
Why couldn't they have made it rectangular?

I don't know, I wasn't there... ;)

I did a lot of my apprenticeship at a steel mill in the late '70s. My foreman explained that to me once when I was the grunt running conduit. He felt it necessary to explain everything to me. Some of it was really good and useful, most of it was drivel. Unfortunately for me I retained almost all of the drivel...
 
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