Re: [Amel Yacht Owners] Re: FW: inverters/chargers
Andrew & Kate Lamb
Many thanks for taking the time to answer my queries so thoroughly - for me and I hope for others this has been a very useful discussion – it sounds like the key here is trust (or lack of) in the wiring in the pedestal and how that may influence safety, and I can well understand the lack of trust in the pedestal even from my relative narrow experience of these in Europe.
I suppose designing these systems is about balancing the relative risks, and perhaps therefore Amel’s decision not to connect the boat’s bonding to the AC ground, particularly for a boat that is designed to travel around the world and plug into all sorts of systems.
In my reading around this it became apparently that there is also a not insignificant risk of GFCI (RCD) failure - I suppose therefore one of the most important things - as with many systems on the boat - is regular maintenance and testing and this also includes the electrical systems.
Canet en Roussillion, France
From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Sunday, February 01, 2015 9:11 PM
Subject: Re: RE: [Amel Yacht Owners] Re: FW: inverters/chargers
I completely agree with Amels philosophy about bonding and totally disagree with ABYC regulations.
I believe that the floating ground on the DC side of the boat and the lack of a connection of the boats bonding and the Ac earth is the way to go.
You just never know what you are plugging into. ABYC standards are written for mostly coastal USA sailors who never plug into a foreign pedestal/
On the last two boats which i personally stripped to the hull and replaced everything, I gained a lot of knowledge how boats were built.
On my other boats I always took a voltmeter/ohm meter to the dock and measured the pedestal socket.
My tartan 37 was 110 volts. when I went to the pedestal at the St Georges dinghy club I encountered 440 volts between the neutral and ground.
On Kimberlite I have a separate AC panel with a volt, amp, and frequency meter in addition to a 3 pole circuit breaker. The breaker and meters are before the boats AC panel. I turn the new breaker off and then plug in. This November after the hurricane in st maarten , I plugged into my pedestal and had 110 volts between the blue and brown and also the earth /. If I did not have my circuit breaker off I don.t know what would have happened. essentially everything was broken in the pedestal the entire bonding of the boat if connected to the AC earth would have been hot.
i can not figure what would have blown out first. If someone was touching something bonded when the plug was inserted in the pedestal i believe they might have been electrocuted.
The connecting of the Ac earth and the boats bonding is an argument that can be made for and against with plausible answers to both. I prefer to keep them disconnected.
----- Original Message -----