On construction sites, is a box required for splices or junction connections for temporary installations when all circuit conductors are from nonmetallic cords?

In the context of construction sites, the requirement for junction boxes for splices or junction connections primarily depends on safety and compliance with electrical codes. When dealing with temporary installations where all circuit conductors are from nonmetallic cords, the need for a junction box can vary based on the grounding provisions.

The correct answer emphasizes that if grounding is maintained properly throughout the temporary installation, then a junction box is not necessarily required. Nonmetallic cords, when used correctly and grounded, mitigate some of the risks associated with exposed connections, such as electrical shock or short circuits. In such cases, as long as the conductor connections are secure and safe, the lack of a junction box does not compromise safety.

In contrast, the other choices do not capture the nuances of electrical codes and grounding requirements for temporary installations. The assertion that junction boxes are generally required fails to consider specific conditions under which grounding can exempt the need for boxes, and the options suggesting limited applicability for temporary use or specific to metal cables do not address the broader spectrum of nonmetallic installations adequately.