Spacing between conduits when conduit enter wireway

[Fred B]

Don't forget bonding bushing size that is usually larger than the locknut.

 

[electrofelon]

Don't forget bonding bushing size that is usually larger than the locknut.

I wouldn't think a BB is larger than a locknut, but now I'll have to dig one up and measure it

 

[infinity]

I wouldn't think a BB is larger than a locknut, but now I'll have to dig one up and measure it

I don't think so either. Bonding bushings have removable lugs so that you can spin them on when they're close together. They should not be larger than the locknut.

 

[readydave8]

Lay 2 lock rings next to each other, measure outer edge to inner edge to find center to center, add 1/8"

 

[Strathead]

Yes, but that more of an issue for distance to opposite wall of the wireway than for distance between raceway entries.

Six times raceway diameter for angle or U pulls 8 times for straight pulls.

This is either incorrect or the wording is confusing. Your statement is about the size of the box, not the spacing between raceways containing the same conductor. 314.28(2) "The distance between raceway entries enclosing the same conductor shall not be less than six times the metric designator (trade size) of the larger raceway."

 

[Fred B]

This is either incorrect or the wording is confusing. Your statement is about the size of the box, not the spacing between raceways containing the same conductor. 314.28(2) "The distance between raceway entries enclosing the same conductor shall not be less than six times the metric designator (trade size) of the larger raceway."

That is reference related to wire bending, cable in cable out.

 

[4-20mA]

Yup, up to 2" the OD is EMT is smaller than RMC. 2½" and larger the OD is the same which is why the same strut straps fit both EMT and RMC.

What's even wackier is that RMC is 10' from end to end with a single coupling attached.

Let's just leave out RobRoy conduits and strut straps

 

[kwired]

Always remember the first rule of conduit: The ID must never exceed the OD.

if it does you lose containment.

 

[LarryFine]

if it does you lose containment.

In the warp core?

 

[kwired]

This is either incorrect or the wording is confusing. Your statement is about the size of the box, not the spacing between raceways containing the same conductor. 314.28(2) "The distance between raceway entries enclosing the same conductor shall not be less than six times the metric designator (trade size) of the larger raceway."

You are right.

But you ever try to pull large conductors into wireway that isn't sized similarly? Short nipple to adjacent items isn't so bad if conductor ends in that item but a long pull like this is a pain and you have higher risk of abrasion of conductors on edge of wireway as well.