Galvanic Isolator - RT 31cb

AGLyme

“Sweetie” RT 31cb
Joined
May 15, 2024
Messages
232
Location
Lyme, CT
Fluid Motion Model
R-31 CB
Hull Identification Number
FMLT3129J213
Vessel Name
Just contracted to buy it, changing nm.
MMSI Number
000000000
The RT 31 has (2) 30 Amp Shore Plugs.
There is no elegant place to mount (2) GI's, or a single 60 amp GI near the Plugs or Breakers.

The Port Lazarette has ample wooden bulkhead space to mount the GI's.

My question please... I researched quite heavily the installation instructions both on TugNuts and YouTube.
YouTube was chock full of Testing info, but almost zero installation how-to's.

I'd like to install (2) 30 amp units, and merely tie into the ground (green) wires that travel right above where the units will be mounted... however, the wires that I want to splice into are AFTER the Breakers... NOT before the breakers, and not before the Plug receptacles. In my reading here in Tugnuts, some folks use (remove and use) the existing green wire that is/was tied into the Breakers, some tie into the Receptacle before the Breakers... and in both cases, a "new" green wire is built and brought from the GI back to either the Breaker(s) or the Receptacle(s).

Is it an issue if I break into the green wire AFTER the Breakers -- but before the main ground bus bar? This obviates the need to build a separate green wire, and, lessens the final amount of the green wire (do not have to build a new and separate green wire)
Thank you in advance.
 
Yes, that's fine. As long as you install it between the shore power inlet and where the green grounding conductor connects to the grounding bus you are ok. It doesn't matter which side of the breaker because only the ungrounded (hot/black) and grounded (white/neutral) conductors are interrupted by the breaker, there is never any break in the green grounding conductor other than a galvanic isolator. (no breaker or switch allowed in the green grounding conductor because it's for safety and not a normally current carrying conductor.)
 
I removed the ELCIs and installed a larger PVC box for the ELCIs and terminal strips for the grounds, breaking the connection at that location. I mounted one ProMariner Prosafe FS60 amp GI in the port lazarette routing my ground conductor to the GI and back to the new junction box, isolating shore power ground from the GI ground.
 
Installed. I went with 2 30amp instead of 1 60 amp. 30 amps are thinner units (in port lazarette) and I like the redundancy.
 
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