your ABYC guy was trying to explain re: green wires, but I don't know where any kind of 'floating' enters into it.According to the ABYC Standards Developer, both my 12 VDC and 48 VDC subsystems would be considered to be 'floating' because none of their current-carrying wires are connected to ground, including the negative terminals of the batteries,. Only the metallic, non-current carrying components within each system are grounded for safety purposes. In my case, those are limited to the motor case and the various metallic parts in physical contact with it, such as the Thunderstruck reduction plate/motor mount, prop shaft, etc. [Prop shaft to have a sacrifical anode attached.] Connection to 'ground' is via a plate on the exterior of the keel, connected to a heavy studded bus located in the bilge. [Thru hulls, chain plates, and stays are also connected to this bus.]
In this arrangement, where the DC systems float relative to ground, overcurrent protection is required (per my ABYC source) on both positive and negative sides of the circuit..
The 120 VAC shore power safety ground will also connect to the grounding bus in the bilge, with a galvanic isolater interposed (rather than an isolation transformer), though I'm still shopping for the most suitable device..
This relatively simple arrangement is possible because my boat has no alternator and starter-equipped engine; no generator; no inverter and no AC appliances installed.
I use a copy of ABYC Standard E-11 downloaded from their website; Diagram 3 on its page 33 most closely resembles my setup though there will be no connection to 'Engine Negative'. Rather, as mentioned above, it will go to the ground bus in the bilge.
_._,_._,_
Groups.io Links:
You receive all messages sent to this group.
View/Reply Online (#32091) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
Your Subscription | Contact Group Owner | Unsubscribe [newarmyguitar24@gmail.com]
_._,_._,_
No comments:
Post a Comment