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Old 05-12-2014, 09:30 PM   #21
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Nightcap, I did some reading on MEN systems as I had never heard of it until you brought it up. All references I can find are land based systems and none mention mixed AC/DC systems as on the type of boats typical on this forum. I don't see how this would work if the AC earth is bonded to the DC negative as recommended by ABYC in US and mandatory in Canada Transport Canada Small Vessel Construction Standards. Am I missing something ?
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Old 05-12-2014, 09:39 PM   #22
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Here's a good article
http://optiloadingsvn.hzs.be/willem/..._knowledge.pdf
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Old 05-12-2014, 09:49 PM   #23
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Quote:
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I read that one, it says nothing about mixed AC/DC systems other than that "ships" rarely use DC.
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Old 05-12-2014, 10:04 PM   #24
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Sorry, missed the DC bit. They are referring to high voltage DC which used to be the norm decades ago. Low voltage DC systems are still wired above ground in a MEN set-up.
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Old 05-12-2014, 10:33 PM   #25
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Quote:
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Sorry, missed the DC bit. They are referring to high voltage DC which used to be the norm decades ago. Low voltage DC systems are still wired above ground in a MEN set-up.
So it would be unsafe to bond AC earth and DC negative (as required in North America) in a MEN system ?
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Old 05-12-2014, 10:55 PM   #26
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Apparently so. Remember, we are talking ships' standards here rather than small pleasure craft where DNV, Lloyds etc. set the rules. I'm not a qualified electrician but am a ships' surveyor and sometimes pretend leckie, this little thread drift is about the extent of my knowledge on this subject but is based on standards we are requiured to enforce such as four yearly grounding resistance tests, GFI checks etc.
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