First, thanks to all for the comments on the first thread. After crawling throw the bowels of son in laws boat
have discovered a few things. Some I mentioned on the previous thread but for clarity will cover it all here.
is a 2004 56' Viking with dual redundant (IE use one at a time to power all systems) 21 kW generators. AC panel has switches for Shore Power
1 & 2, Gen 1 & 2, and loads divided into two banks.
2. Boat came with one 50 amp 120/240 shore power
cord hard wired on a reel. The Hubbell connector has three prongs: one flat and two L shaped with the L turned out. Connector also has a metal collar around the plug
3. In the bottom of the reel cabinet found a 50 amp 120/240 socket which I determined feeds Shore Power 2 to the panel. The socket has the same configuration as the plug
on the Shore 1 reel cord.
as follows: Shore power cords to sockets on the boat. Sockets on the boat to circuit breaker box. Box to Charles isolation transformer. Transformer to Electric
5. Bought a new 120/240 shore power cord, connected to the outlet and plugged into the dock
. On the panel it only showed 107V on L1, 108V on L2. Shore 1 shows 120V on each leg. Checked voltage on the dock
and at the boat end of the new SP 2 cable and it measures 120V on both legs.
6. Disassembled the socket on the boat to check for corrosion
which was moderate BUT the shore power sockets on the boat are not wired how I expected.
My understanding for the correct wiring
The two prongs or sockets on the sockets or plugs that are L shaped are the two hot wires L1 and L2, correctly Red and Black wires. The flat blade is the White neutral wire. The green ground wire connects to the metal outer ring or the flat metal ground on the side of the plugs or connectors.
BUT inside both sockets on the boat that receive the shore power are wired:
Black from socket L1
White from socket L2
Green to the metal ground around the connector
AND no wire or connection at all to the socket that receives the flat blade for the White/Neutral wire. So no connection at all between the W/Neutral in the shore power cord from the dock to the boat.
I looked inside the breaker box where the wires lead directly from the sockets in the cockpit
. Two sets of double breakers, one pair for SP1, one pair for SP2. Both show a white and black pair coming in and out. From there the wires pass through conduits and bulkheads to the electric
panel. I opened the panel and and the double SP1 and SP2 breakers inside the panel have a red and black pair in and out of the breaker, then feeding the load breakers inside the panel.
My questions, in no particular order.
1. If no wires are connected from the boat to the White neutral on the dock doesn't that mean that the safety
ground is carrying the current
from the dock to the boat?
2. The SP1 hard wired system seems to be working fine, voltage is good although the breakers on the dock do get hot. Not sure if that is because we are drawing a heavy load or due to the weird wiring.
3. Is it possible that this is correct due to the Isolation Transformer in the system?
4. Is this setup completely wrong and we're going to set the boat on fire.