On Friday, April 8, 2016 at 5:03:01 PM UTC-7, Rheilly Phoull wrote:
On 6/04/2016 10:39 AM, wrote:
"So when is grease on the terminals bad ??"

Before it is connected. After it is connected grease helps keep the elements away but you don't want it between the mating surfaces.

Hmmm, I wonder how all those switches immersed in oil ever work ??

There's lots of kinds of grease. Some has particles that help prevent wear, but also prevent
metal-metal contact. Some has conductive particles, that might cause unintended conduction.
Some has semiconducting particles, especially to enhance electrical contact. And some,
like petroleum jelly or silicone grease, has no capability to hold metal parts apart (but is
good against corrosion and/or condensing moisture).