Based on the calculations, the length of the box must be equal to 24 inches.
Given the following data:
- Trade size A (larger) = 3 inches.
Article 314 of the National Electrical Code (NEC).
This article provides the standard requirement and dimensions for the installation and use of all electrical boxes and conduit bodies that are used as pull boxes, outlet, junction, etc.
Straight pull with two raceways.
Basically, electrical boxes that contain straight pulls are typically sized based on the largest single raceway which enters the box. Also, you should multiply the trade size of the largest raceway by eight (8) when calculating the minimum length of an electrical box containing straight pull in accordance with Article [314.28(A)(1)] of the National Electrical Code (NEC).
For the minimum length:
[tex]Length = 3 \times 8[/tex]
Length = 24 inches.
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