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Intermediate
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Boat Electrics
4 Lessons
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In the lessons of this module, we explore fundamental safety risks with respect to AC systems on boats. And how to prevent life threatening accidents. This module includes crucially important differences with AC systems onshore.
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After discussing the safety risks of AC systems, we will explore the fundamental differences between AC and DC systems.
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We learn about the importance of the normally non-current-carrying grounding conductor for the safety of AC systems. In the second half of the lesson we will also get to understand a phenomenon called Electric Shock Drowning and how such incidents can be prevented.
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We delve into the ABYC and ISO installation requirements for shorepower-based AC systems on boats and how you can make sure your system is safe and standards compliant.
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This course has been created in a joint effort by Nigel Calder and Dr. Jan Athenstädt. Nigel is responsible for the lecture notes and Jan will take the role of presenter and guide you through the lessons.
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In Australia and NZ the requirements for Reverse Polarity goes one step further, Polarity Indication is not enough anymore it must also be an Interlocking devise so that the Shore Power cannot be connected to a vessel if Polarity is Reversed.
AS/NZS 3004.2:2014 3.5.3.2.
*(NB: you can omit my post if you feel it will confuse as i know you are only looking at ABYC & ISO)
Malcolm,
Thanks a lot for pointing this out! Nigel checked with the head of the NZ standards committee and you are right! The wording in the standard is the following:
“3.5.3.2 Protection against reversal of polarity in the supply lead
Except where shore power is supplied to the boat by an on-board isolating transformer or converter with a polarized output, a means shall be provided for checking the polarity (active to neutral) of the incoming supply.
Such means shall include —
(a) an interlocking device with visual indication such that the shore supply cannot be connected if the polarity is incorrect; or
(b) an automatic correction device with visual indication that matches the polarity of the shore supply to the polarity of the boat.
In multiphase installations, provision shall be made for checking the phase sequence and for matching the shore supply phase sequence with the boat’s phase sequence.”
We love getting feedback like this that allows us to gradually improve our content over time. Nigel added a note about this to the corresponding lecture notes.
Best
Jan