2008 R25 AC Power diagram needed

S

shawnpb

Active member
Joined
Sep 16, 2020
Messages
38
Fluid Motion Model
C-248 C
Hull Identification Number
FMLT2544G708
Vessel Name
MOKUHONU
Hi All, I found a decent DC power schematic diagram, but i need more detail on the AC power system. I've been looking in the forums, but I can't find anything useful. If anyone can list a link of such a schematic diagram, It would really help me out. Thanks!!
 
I might add that my 2008 R25 has the AC Neutral side of the AC volt meter tied to DC ground . This pops the breaker in my new slip with updated shore power containing sensitive GFI plugs. I've read a lot of forum posts here about this condition. I lifted that ground on the meter and the new shore power system works fine. The ABYC code states that The neutral from shore power should be grounded only at the dockside source. It must not be grounded onboard the boat.. SO, do I keep that lifted wire off?? Obviously, I don't want an unsafe condition. Thanks for any feedback!!
 
You're right about the ABYC code, the neutral should only be grounded at the source of power: on shore, at the generator, or at the inverter. I guess you don't have an ELCI breaker like the later boats all have. I would keep the wire removed.
 
Here’s what I have - it’s not much on the AC side but maybe it will help.

IMG_2944.png
 
Rode Trip said:
You're right about the ABYC code, the neutral should only be grounded at the source of power: on shore, at the generator, or at the inverter. I guess you don't have an ELCI breaker like the later boats all have. I would keep the wire removed.
Click to expand...
I don't have an ELCI breaker on my AC panel, but I'd assume thats the type of breaker on the shore power source. Thanks for the response.
 
shawnpb said:
I don't have an ELCI breaker on my AC panel, but I'd assume thats the type of breaker on the shore power source. Thanks for the response.
Click to expand...
If you have an ELCI it would be be close to the shore power inlet on the boat. Mine is on the aft bulkhead in the forward port cockpit locker. I don't think you have one though because it would also trip if you have a neutral to ground connection on the boat. The ELCI, like the shore power pedestal, trips with a 30 mAmp fault current. The ELCI operates the same and with the same purpose as a GFCI outlet on the boat, but the GFCI's trip at 5-7 mAmps.
 
Safety Issue - IF I read this thread correctly, it sounds like you've solved the shore power ELCI issue. But you need to ensure that the boat ground is still intact for safety.
A safely wired boat, ELCI issues aside, should always have the neutral and ground for shore power independent from each other. There are typically three conductors of interest in a boats AC system, black, white and green. The neutral (white) should only be connected to ground at the utility connection, on shore, back at the marina breaker box. So it sounds as if you have resolved that issue. However, you may have an open ground, depending on how the boat is really wired. If "lifting" the ground from the power meter opened the only connection to ground that you have, there could be a safety issue. The boats green AC wire need to be connected to a solid ground to ensure safety, this should be through the green conductor in the shore power cord.

The ground on the boat AC should be able to conduct any faults (read "current that can hurt you") safely to ground at the utility connection. If open, YOU can become the path to ground, and my personal experience is that is not good, and can even be very bad.
 
Yep, fully agree. Potential open grounding needs to be resolved. Thanks for the response!!
 
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