Geoffrey Goode wrote:
> The vehicle body does not earth the
> vehicle as there are four large insulators between that and the earth.
The original discussion was relating to the protection for sensitive
devices within the confines of the car. For this purpose, the car body
is considered ground or zero potential. It may or may not be the same
potential as the actual earth, but that is totally irrelevant.
> The vehicle's body may at a different potential to your own body for
> instance and a charge may jump from you to the vehicle or vice versa.
Having the negative terminal of the battery connected will not avoid
this, so it too is irrelevant to the discussion.
> Think about computers and why you should
> touch the casing which is connected to earth (ground) via the power
> cable's earth prior to working on it.
Same applies to sensitive devices in the car. Match your potential with
the vehicle body by touching it before touching the sensitive device.
Again, totally irrelevant.
-cb
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