On Wed, 23 May 2007 23:52:26 -0400, Wayne.B
wrote:


The AC neutral and safety ground (normally white and green) are
definitely tied together. As I understand it, this is an ABYC
standard although somewhat controversial. The AC safety ground and
the boat DC grounds appear to be totally isolated however.

NO! ABYC, CSA and probably other standards require that the shore
power neutral (white) and the safety ground (green) MUST NOT be
connected on board. (They will be connected somewhere ashore.)

If you have an on-board power source (generator, inverter, or
isolation transformer), then while using that power source, the
on-board neutral and safety ground must be tied together at the
source.

In any case, the on-board safety ground (green) must be tied to the
vessel ground. The shore-side safety ground must be tied to the
vessel ground either directly, or through a galvanic isolator.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
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