Okay, let's break down the specifics of installing that bronze piling light on your saltwater dock with composite pilings. Given the environment and materials you're working with, careful attention to grounding and corrosion protection is key.

Grounding/Bonding



Solid Bronze Fixture and Internal Bonding

While solid bronze is conductive,

do not assume it is internally bonded to ground unless explicitly stated in the manufacturer's documentation. Look for specific markings, a grounding screw inside the fixture body connected to the bronze, or instructions confirming internal bonding. Most high-quality bronze marine fixtures are designed to be connected to the grounding system. Importance of a Proper Ground Connection A solid, continuous ground path is crucial for safety, especially in a wet environment like a saltwater dock. Fault currents will find the path of least resistance, and without a good ground, that path could be through you or anything metal nearby. If No Internal Ground



Run a Separate Bonding Jumper

You'll definitely need to run a bonding jumper from the grounding conductor (green or bare copper) in your 12/2 cable to the fixture body. The grounding wire in the cable should be connected to a suitable ground terminal in the junction box at the base of the piling. From that terminal, a grounding pigtail should be connected to the light fixture base.

Connection Point

The best place to attach the bonding jumper is a dedicated grounding screw or lug specifically designed for that purpose. Failing that, you can carefully attach the jumper to one of the mounting screws, but ensure the screw and the bronze body are both clean and free of corrosion. Consider using a star washer between the screw and the bronze to bite through any oxidation and ensure a good connection.

Sealing and Corrosion Protection



Dielectric Grease vs. Gasket



Gasket is Primary

The gasket provided with the fixture is your primary defense against water intrusion. Make sure it's properly seated and in good condition before installing the fixture. Do not overtighten the mounting screws, which can deform the gasket and reduce its effectiveness.

Dielectric Grease is Secondary (and Recommended)

Applying a thin layer of dielectric grease on the back of the fixture where it contacts the composite piling, and around the mounting screw threads, is highly recommended.

How it Helps

Dielectric grease doesn't conduct electricity (that's why it's called "dielectric"). It acts as a barrier to prevent water and salt from reaching the metal surfaces, which prevents corrosion and galvanic action (especially if you have dissimilar metals involved). It also helps prevent the fixture from bonding with the composite piling over time.

Application

Apply a thin, even coat – a little goes a long way. Make sure to coat the screw threads well.

Additional Corrosion Protection Strategies



Tinned Copper Wire

Excellent choice for saltwater environments.

Marine-Grade Connectors and Junction Boxes

Use only connectors and junction boxes that are specifically rated for marine use. These are designed to be watertight and corrosion-resistant.

Conduit Seal

Ensure the conduit entering the junction box is properly sealed to prevent water from wicking up into the wiring. Use a sealant compatible with your conduit material.

Regular Inspection

Periodically inspect the fixture, wiring, and connections for any signs of corrosion. Clean and re-grease as needed.

Conduit and Junction Box



Material

Use PVC conduit as it is very corrosion resistant.

Sealing

As mentioned earlier, seal all conduit connections and the entry points into the junction box with a marine-grade sealant.

Junction Box Placement

Try to locate the junction box as high as practically possible on the piling, above the highest expected tide level. Even with a watertight box, this provides an extra layer of protection.

Important Safety Considerations



Working on or near water can be extremely dangerous. Always prioritize safety. Turn off power to the circuit before working on any electrical components. Wear appropriate personal protective equipment (PPE), including eye protection and gloves. If you are not comfortable working with electrical wiring, hire a qualified electrician. Especially in a marine environment, improper wiring can create serious hazards. Local Codes

Consult and comply with all applicable local electrical codes and regulations. Coastal areas often have stricter requirements for electrical installations near water.

In summary


Determine if the fixture is internally bonded to ground. If not, you must install a separate bonding jumper.2. Use the gasket provided with the fixture as your primary seal.3. Apply a thin layer of dielectric grease to the back of the fixture and mounting screw threads for added corrosion protection.4. Use marine-grade materials throughout.5. Seal everything properly.6. Prioritize safety and follow all applicable codes.

By following these steps, you'll help ensure a safe, reliable, and long-lasting piling light installation. Good luck! Flag for review