Let's break down NEC 314.2 and address your confusion. 314.2 Round Boxes

This section specifically addresses round boxes. It's not about all hexagonal or octagonal boxes, only those that are circular in shape.

"Where conduits or connectors requiring the use of locknuts or bushings are to be connected to the side of the box." This is the crucial part. It's saying that you can't connect conduit to the side of a round box if the connection relies on locknuts and bushings to secure the conduit to the box.

Why the restriction on round boxes?

Round boxes, by their very shape, offer a curved surface. It is much more difficult to get a good, secure, and reliable connection using locknuts and bushings on the side of a round box than it is on a flat surface. This is due to the fact that the locknut and bushing would be trying to seat on a curved surface, reducing the contact area and potentially leading to loosening or poor grounding.

Addressing Your Confusion

You're seeing conduit connected to hexagonal (6-sided) or octagonal (8-sided) boxes in commercial spaces all the time, and that's perfectly fine.



Hexagonal and Octagonal Boxes are NOT Round

The restriction only applies to boxes that are circular in shape. Hexagonal and octagonal boxes have flat sides that provide a solid surface for locknuts and bushings to seat against.

Think of it this way



Round Box + Conduit on the Side with Locknuts/Bushings = NO (generally). Using conduit with locknuts and bushings on the side of a round box is usually prohibited.

Round Box + Conduit from the Back/Knockouts on the Back= YES (generally). It would generally be fine to use conduit connected to a round box from the knockout holes on the back of the box. The intent is to prevent connections from the curved sides.

Hexagonal/Octagonal Box + Conduit with Locknuts/Bushings = YES (generally). Perfectly acceptable on the sides of these boxes.

In summary

NEC 314.2 is only concerned with round boxes and connections to the sides of those round boxes when using locknuts and bushings. It is not a blanket prohibition on conduit connections to all types of boxes.

Important Considerations



Connectors Designed for Round Boxes

There may be specific connectors designed for use with round boxes that don't rely on locknuts and bushings in the same way. These connectors might be permitted, but you would need to carefully examine their listing and instructions to ensure they are suitable and compliant.

Local Amendments: Always check for local amendments to the NEC, as they can sometimes modify or add to the code requirements.If you are ever unsure about a specific installation, consult with a qualified electrical inspector or a licensed electrician. They can provide guidance based on the specific circumstances and local code requirements. Flag for review