Electrical Safety Advice · Hastings & East Sussex
Green residue at the end of older PVC cables is a warning sign worth investigating—not something to wipe away and forget.
In some homes wired or altered decades ago, a sticky green substance can appear where cable insulation meets switches, sockets or the consumer unit. Electricians often call this “green goo”. It is associated with chemical changes in certain older PVC cable insulation, allowing plasticiser to migrate and react with copper.
Is Green Goo Dangerous?
Its presence does not automatically tell you the condition of every cable, but it can contaminate accessories, affect terminations and indicate deterioration that deserves proper assessment. The level of concern depends on where it is found, how widespread it is and whether insulation or connections have been affected.
- Discolouration or sticky residue around cable ends
- Contamination inside switches, sockets or the consumer unit
- Intermittent faults or unreliable connections
- Evidence that cable insulation is softening or deteriorating
Do Not Rely on a Generic EICR Code
An observation should be classified according to the actual safety risk found during inspection—not simply because green residue exists. The electrician must assess the condition, location and effect on the installation before deciding whether repair, monitoring or cable replacement is appropriate.
What Should You Do If You Find It?
Avoid dismantling electrical accessories yourself. Take a photograph, note the location and arrange an inspection by a suitably qualified electrician. If there is heat, burning, exposed copper or loss of power, switch off the affected circuit if it is safe to do so and seek prompt advice.
Can Green Goo Be Cleaned or Repaired?
Cleaning visible residue may help with assessment, but it does not reverse deterioration within the cable. Depending on the findings, the sensible response may range from monitoring a limited issue to replacing affected cable runs or planning a partial rewire. A whole-house rewire should never be assumed without evidence.
Why It Often Appears During an EICR
An EICR involves inspection and testing of the fixed installation. Opening selected accessories and examining the consumer unit can reveal deterioration that is not visible in everyday use.
Concerned About Older Wiring?
I provide EICRs and systematic electrical fault finding across Hastings, St Leonards, Bexhill, Eastbourne and nearby East Sussex.