Join Date: Sep 2008
Location: Victoria B.C. Canada
Thanked 109 Times in 100 Posts
Rep Power: 10
The problem with bonding all underwater metal is that seacocks are all of one metal and don't really need protection. In today's marinas with both AC power on boats and shorepower everywhere, not always in good condition, this invites the seacocks into an electrical mix that can cause problems they don't have if not bonded.
The link posted above to an article by Stan Honey explains it very well. Here it is again. Grounding
Living aboard in Victoria Harbour