What is Cable Greening?

Cable greening is a phenomenon that occurs in older PVC-insulated electrical cables. It's characterized by a green, oily substance that seeps out of the cable, often appearing around switches, outlets, or junction boxes.

What causes it?

This "green goo" is the result of a chemical reaction between the copper conductors in the cable and the plasticizer within the PVC insulation. Plasticizers are added to PVC to make it flexible, but over time and with exposure to heat, they can break down and react with the copper. This reaction produces a green copper compound, which is what you see oozing out.

Is it dangerous?

While the substance itself is not typically a direct health hazard, it can indicate underlying issues that could lead to electrical problems:

  • Overheating: Cable greening is often a sign that the cable is overheating, potentially due to overloading, loose connections, or poor ventilation.

  • Fire Hazard: Overheating cables can pose a fire risk.

  • Corrosion: The green goo can corrode the copper conductors and connections, leading to further electrical issues.

What should you do if you see cable greening?

  • Don't touch it directly: While not highly toxic, it's best to avoid direct contact with the substance. Wear gloves if you need to handle it.

  • Call an electrician: Cable greening is a sign that your wiring may need attention. A qualified electrician can assess the situation and recommend the best course of action, which may involve replacing the affected cables.

  • Don't ignore it: Ignoring cable greening can lead to more serious electrical problems down the line.

Prevention:

  • Regular inspections: Periodically check your electrical system for signs of wear and tear, including cable greening.

  • Proper installation: Ensure that your electrical system is installed correctly and that cables are not overloaded.

  • Ventilation: Make sure that electrical equipment and wiring have adequate ventilation to prevent overheating.

Remember: If you're unsure about any aspect of your electrical system, always consult a qualified electrician.