ABYC Wiring Rules. Simplified with explanations.

ABYC Wiring Rules applied in practical situation.

ABYC Wiring Rules are easily understood by reading one Wiring Rule at a time.  Comply and SeaBis Master will indicate Normal (green), So,  no stray current, so no electrolysis corrosion.  That is the result of the SeaBis Master System.

However, if you are busy? There is no need to read any further.  
We will, step by step, guide you or another through prevention of the stray current that is the ONLY  CAUSE of 97 % of all corrosion. 
Email; seabisbg@gmail.com

In addition, complete contact details here.

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ABYC Wiring Ruiles compliance. Corrosion CAUSE prevented, permanently
ABYC Wiring Rules compliance.


8-year free guarantee, warranty and (link) diagnosis support with SeaBis Master System: Above all, we will prevent all the stray current that is the ONLY CAUSE of marine electrolysis corrosion. However, How to Prevent Corrosion must be complied with. Guarantee here.

External verification: Wikipedia electrolysis. Note: The first paragraph specifically states “direct electric current (DC)”  caused by your batteries.  Not AC / shore power.

Some manufacturers intentionally generate a captive spare parts market. Therefore, use SeaBis to prevent becoming a victim.  On other words, use SeaBis Master to test everything electrical – generator, battery charger, winch, thruster, engine especially mains / DC appliances with SeaBis Master. Above all, immediately you buy and install. In conclusion, even if you add battery clips to SeaBis Master.  So, making it a Portable SeaBis Master System.
In addition, contact us, and we will step you through how not to buy a source of corrosion.


Non-genuine ABYC Wiring Rules: 

Be aware, there are various partial copies of ABYC Wiring Rules that are not produced by ABYC.  They are produced by manufacturers selling their own product that does not comply with genuine ABYC Wiring Rules.  In conclusion, to determine if equipment causes stray currents that create marine electrolysis corrosion, test with SeaBis Master.

Of importance, physics has not changed in hundreds of years. The same physics that were in force when ABYC Wiring Rules were written are still in force today.  However, a minority of manufacturer’s principles have changed. Use (link) SeaBis Master to check for stray current generating purchases immediately after you buy and install.


ABYC Wiring Rules with ABYC Item numbers in italics:

1. This is rock hard and definite.
Bonding and DC grounding conductor shall not be used as battery negative: DC Grounding Systems and Bonding – A metallic hull, or the bonding and DC grounding systems, shall not be used as a return conductor. (See Figures 9A and 9 B, and Figures 10 A and 10 B, and E-11.18 DC Grounding and Bonding.)

2. This is rock hard and definite.
The DC Grounding Conductor must carry no current. Battery negative carries 80% of the battery positive.
Definitions – Continued that is intentionally maintained at boat ground potential. DC grounding conductor – A normally non-current carrying conductor used to connect metallic non-current carrying parts of direct current devices to the engine’s negative terminal, or its bus, for the purpose of minimizing stray current corrosion.

3. This is rock hard and definite.
Battery negative must be insulated from the engine and drive train: The ungrounded battery cable shall be routed to avoid contact with any part of the engine or drive train.

4. This is rock hard and definite.
Battery negative carries 80% of battery positive current, so must be insulated: Appliances and fixed DC electrical equipment shall be designed so that the current carrying parts of the device are insulated from all exposed electrically conductive parts.

5. This is rock hard and definite.
A third wire is essential. The third wire is earth and must never connect to any battery! The battery negative is not to be used as a DC grounding conductor. Routing – The DC grounding conductor shall be routed from the device to the engine negative terminal or the DC main negative bus by one of the following means: The DC grounding conductor shall be routed together with the current carrying conductors as a third wire; The DC grounding conductor shall be routed as a separate conductor.

6. This paragraph conflicts with Item 7, below, and the remainder of ABYC Wiring Rules.  I assume by DC Grounding bus, ABYC mean DC negative. Never connect DC negative to the mains earth or hull or engine body.  Then there is non conflict. DC Grounding Bus The DC grounding bus shall be connected directly to the engine negative terminal or the DC main negative bus.

7. This is rock hard and definite.
The battery negative is not to be used as a DC grounding conductor. The DC grounding conductor shall be routed as a separate conductor.

8. HF  SSB Radio and Radio Ground Plate.

ABYC Wiring Rules complying electrolysis CAUSE prevention: 

Fit a special capacitor in series with the Tuner connection to the (metal) hull.  That will stop battery negative on the Tuner metal body causing connecting DC negative to hull / water so causing electrolysis. The capacitor allows the radio to work correctly (pass AC in both transmit and receive).  While stopping DC.   So, stopping the stray current that causes marine electrolysis corrosion. Capacitor type: non polarised, co-axial.  Rated at: 0.47 microfarads, 2,000 volts. Connected in series with Tuner to hull copper strap. Or use a double pole battery supply switch for HF  SSB, so switching off battery negative and positive on one shaft. Radio Ground Plate – If the radio ground plate is connected to the engine negative terminal, the connecting conductor shall meet the requirements of ABYC E-4, Lightning Protection, since a radio ground plate may also function as a lightning ground plate.

Suggested reading:
Corrosion CAUSE knowledge base here.

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