The grounding is attached at the inverter
, and to the gen set, and then to the dockbox if I read that correctly. Sounds correctly connected to the power sources but hard to tell.
The green wire could play many roles, including bonding, lightening protection and SSB interference
prevention, but its most important role is to prevent lethal shocks. This gets a bit confusing on boats with multiple AC power supplies (a genset, an inverter
, and shore power) when it comes to switching from one source to another. The system must be configured so that both the hot (black) wire and the neutral (white) wire get switched from one source to the next,--- but the green wire doesn’t. The grounding connection must always be continuous to the ground point at the power source. The green wire, when the system’s operating normally, shouldn’t carry any current
at all. But if there is a short circuit, the current
is delivered to the metallic case of an appliance. Without an alternate route
for the fault current to travel back to the source of power, the case of the equipment
becomes live. If a person touches the case, her body becomes the alternate route
to ground, bypassing the neutral (white) conductor and exposing him to full AC voltage potential—likely a lethal encounter or a very bad day at the least Here’s where the grounding wire comes in.
This third wire, attached to the case of the appliance, carries the fault current back to the power source and trips the circuit breaker, shutting off current flow. Marine-grade circuit breakers are designed to be “trip-free,” which means the circuit can’t be turned back on until the problem is solved
. In the grounding system in AC circuitry, the green wire must take a direct path back to the source of power and at that point be connected to the neutral conductor for the scenario above to play itself out. Neutral and grounding are only connected at any AC power source --including Gen set /inverter. So while the green wire may also being double duty for bonding, best to have a second opinion be sure if there is any doubt on the wiring