In the context of electrical installations, “green goo” refers to a sticky, green substance that can sometimes ooze out of older PVC-sheathed electrical cables. It is not related to any commercial product but is instead a chemical reaction involving the cable materials. Below is a fact sheet about green goo in electrical installations:

What is green goo in electrical installations?

Definition: A sticky, green liquid or substance that leaks from older PVC-insulated electrical cables.
Cause: This occurs due to a chemical reaction over time between the plasticizer in the PVC insulation and the copper conductor.

Why does it happen?

Material Degradation:
The plasticizer (added to PVC for flexibility) can degrade over time, especially under heat or environmental stress.
When this happens, it reacts with the copper conductor to produce a green, oily residue.
Age of Cables:
Commonly found in cables installed in the 1960s to 1980s.
Cables manufactured during this period often had less stable plasticizers.
Environmental Factors:
High temperatures or electrical overloads can accelerate the reaction.

Is green goo dangerous?

Fire Risk:
The goo itself is not flammable, but its presence may indicate cable degradation, which can lead to insulation failure or short circuits.
Electrical Safety:
Degraded insulation increases the risk of electric shock.
Health Hazards:
The goo may contain harmful chemicals, so handling it with bare hands is not recommended.

What should you do about it?

Inspect the Installation:
Look for signs of green goo around outlets, switches, and junction boxes.
Check if the insulation appears brittle or damaged.
Professional Assessment:
Hire a qualified electrician to evaluate the extent of the problem.
They may perform insulation resistance tests to assess cable safety.
Replacement:
In many cases, affected cables need to be replaced.
Modern PVC cables use more stable plasticizers and are less likely to develop this issue.
Precautions during Handling:
Avoid direct skin contact with the goo. Wear gloves and ensure good ventilation.

Preventative Measures

• Regularly inspect older electrical installations.
• Avoid overloading circuits, as excess heat accelerates material breakdown.
• Upgrade old wiring systems during renovations or property updates.

If you suspect green goo in your electrical system, prioritize professional inspection to ensure safety.