Admin Table of Contents
- 1 How do you determine the minimum box size for straight pulls?
- 2 How do you determine the size of a junction box?
- 3 Is a pull box the same as a junction box?
- 4 What is the difference between junction box and pull box?
- 5 How big does a straight pull box have to be?
- 6 What’s the minimum distance between a pull box and wall?
How do you determine the minimum box size for straight pulls?
Straight pulls need 8 times the the diameter of the largest conduit/raceway. In this case, simply multiply your largest raceway size by 8, and that will give you the minimum length for your box.
When sizing a box for a straight pull the length of the box shall not be less than times the largest conduit entering the box?
eight times
In straight pulls, the length of the box must not be less than eight times the trade size (metric designator) of the largest raceway.
How do you determine the size of a junction box?
Start with the largest raceway size like you did in the straight pull, but also do the following:
- Multiply the raceway size by six, rather than eight.
- Add together the sizes of any other raceways on the same wall and row.
- Add the results of step 1 and step 2.
How do you size a pull box?
The depth of a box for a straight pull is determined by the size of the largest conduit and by space required by locknuts and bushings. On the other hand, the pull box length must be at least eight times the diameter of the largest conduit: Assume a pull box has four conduit runs, and the largest diameter is 4”
Is a pull box the same as a junction box?
As a rule of thumb, pull boxes are used when conductors are pulled straight through a box and terminated down-stream. On the other hand, junction boxes can be used for splicing or tapping conductors. Larger boxes provide more capacity, and they make pulling, splicing, tapping or positioning the conductors easier.
What size box is needed for a GFCI outlet?
In practice, definitely! It’s perfectly legal to put a GFCI in a 12 cubic inch “Handy-Box”.
What is the difference between junction box and pull box?
What is the minimum length on a straight pull?
32 inches
The minimum length required because of the straight pull is 32 inches (4 x 8 = 32). Since this dimension also contains angle pulls, additional calculations must be performed. The largest raceway entering the top of the box is a 3-inch conduit, therefore multiply three by six (3 x 6 = 18).
How big does a straight pull box have to be?
Straight Pull: Left to Right: 8” x 2 = 16” Right to Left: 8” x 2 = 16” Your pull box must be at least 16” wide. 1 Left to Right: 8” x 2 = 16” 2 Right to Left: 8” x 2 = 16” 3 Your pull box must be at least 16” wide.
How to calculate the size of a raceway pull box?
As an example, a 3-inch raceway pull with another 2-inch raceway entering the same wall would be calculated as six times 3 inches plus 2 inches which results in a minimum width of 20 inches. Calculate the minimum height of the pull box using the same formula as the width. In the example, the minimum height would also be 20 inches.
What’s the minimum distance between a pull box and wall?
As an example, a 3-inch raceway U-pull with another 2-inch raceway entering the same wall would be calculated as six times 3 inches plus 2 inches, which results in a minimum distance between the entry and opposite walls of 20 inches. Calculate the minimum distance between raceways by multiplying the largest raceway by six.
Can a junction box contain only straight pulls?
A box containing only straight pulls that is calculated by the straight-pull method could be too small if there are spliced conductors in the junction box. A junction box with only straight pulls containing spliced 4 AWG or larger conductors must comply with the minimum-size requirements of 314.28 (A) (1) and (A) (2).