Sparky2791
Senior Member
- Location
- Northeast, PA
- Occupation
- Electrical Design
Do these open bottom polymer concrete boxes fall under the sizing requirements of NEC 314.28? Open bottom so U style pulls will be made inside the boxes.
Sizing 'Quazite' Open Bottom In Ground Box
- Thread starter Sparky2791
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
314.1 Scope.
This article covers the installation and use of all boxes and conduit bodies used as outlet, device, junction, or pull boxes, depending on their use, and handhole enclosures. Cast metal, sheet metal, nonmetallic, and other boxes such as FS, FD, and larger boxes are not classified as conduit bodies. This article also includes installation requirements for fittings used to join raceways and to connect raceways and cables to boxes and conduit bodies.
This article covers the installation and use of all boxes and conduit bodies used as outlet, device, junction, or pull boxes, depending on their use, and handhole enclosures. Cast metal, sheet metal, nonmetallic, and other boxes such as FS, FD, and larger boxes are not classified as conduit bodies. This article also includes installation requirements for fittings used to join raceways and to connect raceways and cables to boxes and conduit bodies.
Sparky2791
Senior Member
- Location
- Northeast, PA
- Occupation
- Electrical Design
So what you are 'saying' is the quazite box is classified as a handhole enclosure. The one thing that makes this tough is calcs are based on conduit rows. When they install conduits in these sometimes whey do not form a row.
Probably not really helpful but we install these often. We run conduit up from the open hole bottom and also drill holes in the sides. Obviously depends on needs to which method we use. Have also drilled drainage holes. Usually when we run up the bottom it is because we have conduit coming from multiple directions, not necessarily square to the hand hole, and is just easier to do so.
- Location
- Illinois
- Occupation
- retired electrician
The only things I would worry about is the 6x between raceways that contain the same conductors, and the 6x to the opposite wall. You can apply the exception to the 6x from the opposite wall, but often that is not enough room for larger conductors in a hand hole...the exception is really aimed at conduit bodies.
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