Covers of outlet boxes must be provided with approved ___ for holes through which flexible cord pendants may pass.

Covers of outlet boxes must utilize approved bushings for holes that accommodate flexible cord pendants. Bushings are specifically designed to protect the cord from damage caused by abrasion or sharp edges around the hole, ensuring that the integrity of the cord is maintained. They also help in guiding the cord smoothly through the outlet box, reducing the risk of accidental disconnections or stress on the cord.

Choosing bushings is essential for safety and compliance with electrical codes, which mandate that any passageway for conductors must include protective measures to prevent potential electrical hazards. By using bushings, electricians ensure that the installation adheres to safety standards and prolongs the lifespan of the flexible cords being used.