Why Is This Electrical Wire Turning Green?

That green color is not paint—it is corrosion on the copper conductor.

Outdoor electrical panels are exposed to rain, humidity, condensation, and temperature changes. When moisture enters through a damaged fitting, service cable, meter enclosure, or improperly sealed opening, it can travel along the wire and react with the copper. The result is the green corrosion visible in this picture.

This condition should never be ignored. Corrosion can weaken the conductor, damage the connection, increase electrical resistance, and produce dangerous heat. The damaged insulation near this lug is another warning sign that the connection may already have experienced overheating.

What Is the Proper Repair?

Simply brushing off the green corrosion and tightening the lug is not a dependable repair. The correct solution is to:

• Have the utility disconnect the power when required

• Determine how far the corrosion has traveled inside the conductor

• Replace the damaged conductor or service cable

• Inspect and replace any corroded or heat-damaged lug

• Correct the source of the moisture

• Seal and weatherproof the service entrance properly

• Torque all connections to the manufacturer’s specifications

• Test the completed repair before restoring service

Never touch a corroded service conductor or attempt this repair yourself. Service equipment can remain energized even when the main breaker is turned off.

If you notice green wires, rust, water, burning odors, flickering lights, or damaged insulation inside your electrical panel, contact a licensed electrical contractor immediately.

Freddie America Electrical Contractor

Your Neighborhood Electricians

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