When is it permissible to use a round box in electrical installations?

Using a round box is permissible in electrical installations when it does not require locknuts or bushings. This situation typically arises with certain types of installations where the box design and the method of securing cables do not necessitate the additional hardware. Round boxes are often appreciated for their ease of installation, especially in applications where space is tight or where a streamlined approach is beneficial.

In simpler terms, round boxes are versatile and can be used effectively when the installation method allows for a more straightforward setup without the need for additional mechanical support or protective measures. This makes them suitable for many residential and commercial applications where compliance with electrical codes and safety standards is met without complications.

In contrast, using a round box specifically for connecting to flexible conduit or only in situations with multiple devices may not align with best practices and specific code requirements. There are also scenarios where round boxes would not be the ideal choice at all, indicating that their use is subject to specific conditions rather than a blanket permission.