No, you cannot put THHN wiring for a low-voltage (15V AC) pool light in the same conduit as the 120V circuit for the pool cover motor. Here's why: NEC (National Electrical Code) Requirements

The NEC has specific rules regarding wiring for pool equipment, and mixing voltage levels in the same conduit is generally prohibited for safety reasons. This separation helps prevent potential hazards like voltage leaks and electrical interference.

Insulation Breakdown

While THHN insulation is robust, having two different voltage levels in the same conduit introduces a higher risk of insulation breakdown over time. If the insulation fails, the higher voltage could potentially energize the low-voltage circuit, creating a dangerous situation.

Safety Concerns

Swimming pools and water features have inherent electrical hazards. Mixing voltage levels near water amplifies the potential for electric shock. Following NEC guidelines for separation of wiring is crucial for swimmer safety.

Grounding

The grounding requirements for low-voltage pool lighting and 120V pool equipment are different. Separating the circuits allows for proper grounding to minimize the risk of electrical shock.

What to Do Instead


Separate Conduits

Run separate conduits for the 15V AC pool light and the 120V pool cover motor. This is the safest and most code-compliant approach.2.

Low Voltage Cable

If running a separate conduit is not feasible, consider using a low-voltage cable specifically designed for wet locations and direct burial, and keep it physically separated from the 120V circuit. Make sure the low-voltage cable is rated for pool applications.3.

GFCI Protection

Ensure that both the 120V pool cover motor circuit and the 15V AC pool light circuit are protected by Ground Fault Circuit Interrupters (GFCIs).4.

Consult a Qualified Electrician

Always consult a licensed electrician who is familiar with pool electrical codes and regulations. They can assess your specific situation and recommend the safest and most code-compliant wiring solution. They will also be able to ensure that all wiring and equipment are properly grounded.

Important Note: Pool electrical codes can be complex and vary by location. It's essential to follow local codes and regulations to ensure the safety of your pool and its users. Flag for review