What purpose do lock nuts serve in electrical installations?

Lock nuts serve a crucial role in electrical installations by mechanically securing a fitting, such as a conduit connector or a fitting to a junction box, thus preventing it from loosening due to vibrations or thermal expansion. When properly tightened, lock nuts create a tight fit that ensures the stability of the connection, which is essential for maintaining the integrity and safety of the electrical system.

While providing electrical insulation, attaching conduits to junction boxes, and grounding electrical installations are all important aspects of electrical work, they do not accurately describe the primary function of lock nuts. Their primary design is to ensure that fittings remain secure, minimizing the risk of loose connections that could lead to electrical hazards or equipment failure.