A PAR lampholder in a weatherproof box can be supported by RMC when which conditions are met?

A PAR lampholder in a weatherproof box requires specific support conditions to ensure safety and compliance with electrical codes. When both conditions are met, the use of Rigid Metal Conduit (RMC) provides the necessary support and helps maintain the integrity of the installation.

One key condition is that at least two RMCs must enter the box, which provides a stable and secure means to hold the lampholder in place and prevents any potential movement or strain from affecting the connections inside the box. These conduits act as a structural support system that complements the lampholder's function, ensuring it remains securely mounted.

The second condition relates to the length of the RMC stubbed out, which is limited to no more than 18 inches. This restriction is essential because excessive length could create potential hazards, such as mechanical stress on the connections or points where the conduit might become damaged or degrade over time. By keeping this length within specified limits, the installation remains safer and more manageable.

Both conditions working together ensure that the lampholder is properly supported and that any risks associated with improper installation are minimized. This is why the completion of both requirements is necessary for the correct support of a PAR lampholder in a weatherproof environment.