Temporary lights shall not be suspended by their electric cords unless ________________________.

The statement emphasizes a crucial safety standard in electrical installations, particularly regarding temporary lighting. When cords and lights are designed to be suspended, they have been tested and rated to ensure they can safely support their own weight and any additional stress that may be applied.

The design specifications for such cords would typically include factors like tensile strength, heat resistance, and electrical load capacity. When these items are specifically manufactured for suspension, they meet rigorous safety standards that prevent hazards such as electrical shock, short circuits, or fire risks.

It is critical to avoid suspending lighting fixtures with cords not intended for that purpose, as this could lead to failure under stress or improper use, which poses risks to both the equipment and individuals in the vicinity. The other options suggest either oversight or subjective assessments of safety, but without proper engineering design, those elements alone do not ensure the same level of safety that a properly rated suspension system would provide.