The primary code section that addresses corrosive environments for electrical components at swimming pools in the United States is found in the National Electrical Code (NEC), specifically Article 680, "Swimming Pools, Fountains, and Similar Installations."

While the entire Article 680 is relevant, these sections are particularly important when considering corrosion: 680.14 Corrosive Environment

This section is crucial. It mandates that enclosures for service equipment, switchboards, panelboards, motor controllers, junction boxes, raceways, surface-mounted enclosures, recessed boxes, and other electrical equipment installed in a corrosive environment must be made of corrosion-resistant materials suitable for the environment. Or, they must be protected by corrosion-resistant coatings.

680.21(A) Motors

This section addresses motors for pool equipment. While not explicitly stating "corrosion," it requires motors to be GFCI protected, which reduces the risk of electrical failures due to corrosion that might lead to ground faults. Proper selection of motor enclosures also minimizes the risk of corrosion related issues.

680.22(A)(1-6) Receptacles, Lighting Fixtures, and Lighting Outlets

These sections dictate the location of receptacles, lighting fixtures, and outlets relative to the pool. Maintaining minimum distances helps to reduce exposure to corrosive pool chemicals and moisture. Using suitable enclosures is important here.

680.26 Equipotential Bonding

While not directly about "corrosion resistance" of enclosures, equipotential bonding is critical to minimize voltage gradients in and around the pool. These voltage gradients can accelerate corrosion of metallic parts. Proper bonding can greatly reduce the corrosion risk to metallic components in and around the pool.

680.42 Spas and Hot Tubs

Similar requirements for corrosive environments apply to spas and hot tubs as well.

Key Considerations for Corrosive Environments around Pools



Chlorine and Other Chemicals

Pool water contains chlorine and other chemicals that can be highly corrosive to many metals. Even airborne chlorine vapor can cause corrosion.

Moisture

Constant exposure to moisture exacerbates corrosion.

Saltwater Pools

Saltwater pools are especially corrosive to many metals due to the electrolytic properties of saltwater. Extra care must be taken.

Materials and Methods for Corrosion Resistance



Stainless Steel

Certain grades of stainless steel are highly resistant to corrosion, but not all grades are suitable for pool environments. 316 stainless steel is commonly recommended.

PVC

PVC conduit and enclosures are corrosion-resistant.

Fiberglass

Fiberglass enclosures are another option for corrosive environments.

Epoxy Coatings

Applying epoxy coatings to metal enclosures can provide a protective barrier against corrosion. However, ensure the coating is specifically rated for chlorine exposure.

Placement

Locating electrical equipment as far away from the pool as possible helps to reduce exposure to corrosive elements.

Sealing

Properly sealing enclosures and conduit fittings is crucial to prevent moisture and chemical vapors from entering.

Regular Inspection

Regularly inspecting electrical equipment for signs of corrosion is essential for maintaining safety and preventing failures.

Important Notes



Local Amendments

Always check with your local electrical inspector for any amendments to the NEC that may be in effect in your jurisdiction. Local codes may have stricter requirements than the national code.*

Qualified Electrician

All electrical work around swimming pools must be performed by a qualified electrician who is familiar with the NEC and local codes.

In summary, while 680.14 directly addresses corrosion, the entire Article 680 is vital for ensuring safe electrical installations in and around swimming pools, minimizing the risk of corrosion-related hazards. Consider all factors and consult a qualified electrician for proper material selection and installation practices. Flag for review