How should junction, pull, and outlet boxes be installed behind modules or panels?

The requirement for junction, pull, and outlet boxes to be accessible by displacement of modules is established to promote safety and maintain the functionality of electrical systems in solar installations. This means that if there is a need to access the electrical connections within those boxes, it should be possible to do so without needing to remove or damage the modules or panels.

This access method ensures that maintenance, repairs, or inspections can be performed efficiently and safely. It aligns with the NEC's emphasis on the need for accessibility in electrical installations, which is crucial for ensuring that any necessary work can be conducted without undue risk and with minimal disruption to the system.

The other choices do not align with this requirement. Sealing junction boxes would impede access, while specifying that access needs to be through tools does not provide the necessary direct access preferred for safety and maintenance. Permanent installations imply that they cannot be accessed easily, which contradicts the necessity for accessibility in electrical work. Thus, the emphasis on accessible by displacement ensures that safety and compliance with installation practices are upheld.