On Sat, 16 Oct 2004 10:03:32 +0000, John Proctor wrote:

[snip]


A survey requirement in Australia for some states is to have both
positive and negitive terminals switched. This is because it completely
disconnects the battery from the system when switched off. This avoids
any possibility of a leakage path except for a switch failure.

Interrupting just one pole also avoids any possibility of a leakage path
except for a switch failure.

--Mac