Pull Box or Elbow?

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erickench

Senior Member
Location
Brooklyn, NY
Here's a another dandy.
A 4"-conduit run changes it's direction from horizontal to vertical and a pull box is installed at this point to facilitate fishing wire into the conduit. For this purpose, it is best to place

A. an elbow at the turn and install the box close by the straight run of conduit
B. the box at the turn, with the largest dimension in the horizontal direction
C. the box at the turn, with the largest dimension in the vertical direction
D. the box at the turn with the largest dimension at right angles to both the
vertical and the horizontal conduits
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
That book would have been better off posting question like the ones below.


1. What color is a green ground screw?______________________

2. Electricity will leak out of pipes if you do not use rain tight fittings. T F

3. To trip a circuit breaker, you must stick out your foot as it walks by. T F

4. When dealing with conduit, the O.D. must exceed the I.D. or the hole will be on the outside. T F

5. A keyless fixture cannot be unlocked. T F
 

tkb

Senior Member
Location
MA
How many elbows before and after the pull box?
I know this will change depending where the box is located.
Also would the cables be pulled through the box or pulled to the box, or would this be the feeding point.

There are several variables that would determine the position of the box in the run.
Always keep pulling in mind.
 

erickench

Senior Member
Location
Brooklyn, NY
Here take a look at this one.

For rewiring existing raceways, the number of conductors permitted is

A. greater than for new raceways
B. the same as for new raceways
C. less than for new raceways
D. sixty-five percent greater than for new raceways
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
Here take a look at this one.

For rewiring existing raceways, the number of conductors permitted is

A. greater than for new raceways
B. the same as for new raceways
C. less than for new raceways
D. sixty-five percent greater than for new raceways
That set of questions is based on old codes. I am not sure when the rule was changed but I think it was sometime in the 60s. Under the old rules you were only permitted a 25% wire fill for new work and a 40% wire fill for re-work.

This is the rule that caused problems for conduit seal fittings. When these fittings were designed they were only based on the 25% fill for "new work". The code was changed to permit the 40% fill for new work but the seals were not re-designed for this. Even today a "standard" seal fitting is for a 25% wire fill. They make over sized seals for the 40% fill, or you can use a larger trade size seal with reducing bushings.
 
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