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Gil wrote:
I'm about to replace my two 30A shore power cords, but am wondering if there's
any reason not to go with a single 50A power cord instead. I realize I'll
have to change the on boat connector and would have to carry a single 50A to a
single 30A and a single 50A to dual 30A adapters. But in the long run I'll
end up with less weight and an easier set-up.
Am I missing something in my thought process?
REPLY
Yes!
As with anything else there are always hidden considerations.
When you go to a 50 Amp 4 wire connection your 120V appliances are now
connected to opposite sides of a center tapped neutral.
There is a danger that if the neutral wire breaks or goes high resistance then
all your 120V appliances are now effectively wired across 240V and may suffer
damage.
To protect against such an event the best solution is to use an isolation
transformer which has only a 240V input winding but has a split or center
tapped output winding.
We have previously discussed the problems of loose connectors in the shore
cord as well as the problems with floating docks and flexing cables that
break under stress. These are all conditions outside the boat and may be
missed by the boat owner who focuses only on internal wiring issues.
Regards
Arild
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