Queensland Govn. Oz.
http://www.deir.qld.gov.au/electricalsafety/publications/alerts/slime/index.htm
[code:1]Green exudate seeping from PVC
Issued 4/1996
Reissued 11/2005 and 11/2006
The Electrical Safety Office has investigated the possible safety issues of a green oily substance exuded by some thermoplastic insulated and sheathed cables. The results were that:
- The affected cables are V60 and V75 type PVC insulated and sheathed cables.
- The substance is a plasticiser used in the manufacture of the cable.
-The release of the substance is initiated and exacerbated by high ambient temperatures such as can be found in ceiling spaces and in hotter climates.
- The substance is not conductive and therefore not liable to electrical tracking.
- The presence of the substance will not alter the flame propagation characteristics of the cable.
- The presence of the substance does not necessitate replacement of the cable.
-Cables should be assessed for replacement only when insulation tests reveal failure or when cracking of the insulation becomes apparent.
- The green exudate is mildly toxic and can cause burning and irritation, especially to mucous membranes such as in the eyes, nose and mouth.
- There has been no epidemiological link established with cancer in humans.
- The substance is not water soluble and should be removed from hands using an oil solvent type of cleanser. Methylated spirits is a suitable solvent for cleaning the substance from switch plates etc. Caution: do not use excessive amounts of methylated spirits as it could create a fire hazard. Power to any electrical equipment and sockets must be turned off at the switchboard, and the methylated spirits should be applied using a dampened cloth.
In some cases, such as behind light switches or socket outlets, the amount of exudate can be reduced by forming a drip loop in the cables below the terminal. This must be carried out by a licensed electrical worker only.
Last updated October 31, 2006[/code:1]
I have seen a report of the exudate being found in and around electrical gear at a nuclear power station in the US ... Advice pretty much as above.