Which of the following is NOT a purpose of a conduit?

The primary purposes of a conduit are to provide physical protection to electrical wires, to offer support for electrical devices, and to facilitate grounding of circuits. When considering these functions, heat insulation is not typically one of the key purposes associated with conduit systems.

Conduits are primarily designed to safeguard wiring from environmental factors, mechanical damage, and other hazards that could compromise the integrity of the electrical system. They also play an important role in routing and supporting various electrical devices, ensuring that they are secure and properly positioned.

Grounding of circuits is another critical function that conduits can serve, as they help ensure that electrical systems have a safe path to dissipate fault currents, which is essential for both safety and compliance with electrical codes.

In contrast, while heat insulation may be important in specific applications or materials, it does not directly align with the fundamental roles that conduits are intended to fulfill in an electrical installation. Therefore, identifying heat insulation as a function not associated with conduits is accurate.