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Old 23-11-2022, 14:58   #76
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Re: Step down transformer for isolation on boat.

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The issue is that thd boat is on tbd hard etc a remote rcd is awkward , the unit I mentioned has a step back reconnection times but only three times. If the fault exists the unit will trip again immediately so the shock risk is not increased.
Every time it resets, the shock risk is increased. Only if it stays off is the risk not increased. Such is what logic dictates
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Old 24-11-2022, 04:18   #77
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Re: Step down transformer for isolation on boat.

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Every time it resets, the shock risk is increased. Only if it stays off is the risk not increased. Such is what logic dictates


How does the shock risk increases?
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Old 24-11-2022, 06:26   #78
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Step down transformer for isolation on boat.

Auto-reclosing haz V circuits is pretty edgy. A swimmer might be exposed to multiple hits? It does take some time for these reopens to occur. Not saying its dangerous, but clearly not as safe.
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Old 24-11-2022, 07:35   #79
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Re: Step down transformer for isolation on boat.

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The first thing to realize is that there are no ABYC-approved isolation transformers in production at this point since Charles Industries discontinued production last year.


The ABYC standard requires a grounded metal shield between the primary and secondary windings. This allows a GFCI/RCD in the primary to detect and trip in the case of any insulation failure in the primary that would undermine the isolation provided by the transformer.

There are a number available from different companies, and have been for quite a long time. Olssen and Acme/Hubbell are two I have used personally. Both have the requisite internal ground shield required to be an "isolation transformer" in the context and definitions of ABYC.
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Old 24-11-2022, 07:44   #80
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Re: Step down transformer for isolation on boat.

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Auto-reclosing haz V circuits is pretty edgy. A swimmer might be exposed to multiple hits? It does take some time for these reopens to occur. Not saying its dangerous, but clearly not as safe.
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Old 24-11-2022, 09:10   #81
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Re: Step down transformer for isolation on boat.

@tanglewood #79
Add A.N.G. to that list.
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Old 24-11-2022, 10:27   #82
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Step down transformer for isolation on boat.

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Originally Posted by team karst View Post
Auto-reclosing haz V circuits is pretty edgy. A swimmer might be exposed to multiple hits? It does take some time for these reopens to occur. Not saying its dangerous, but clearly not as safe.


Swimmers are totally protected h the marina RCD systems, swimmer based . Electro shock in Europe is virtually unheard off.

Interestingly my marina pillar rcbo are self resetting
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Old 24-11-2022, 14:32   #83
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Re: Step down transformer for isolation on boat.

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Originally Posted by goboatingnow View Post
Swimmers are totally protected h the marina RCD systems, swimmer based . Electro shock in Europe is virtually unheard off.

Interestingly my marina pillar rcbo are self resetting
But in the US, marinas most often donít have RCDís. Also, if they have, you donít need auto-reset.
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Old 25-11-2022, 01:27   #84
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Step down transformer for isolation on boat.

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But in the US, marinas most often donít have RCDís. Also, if they have, you donít need auto-reset.


My point being self resetting is not uncommon
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Old 26-11-2022, 15:05   #85
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Re: Step down transformer for isolation on boat.

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My point being self resetting is not uncommon

north america introduced a shore cord (smart cord) that would cut out if it got to hot, it was auto reseting. they got stopped shortly after because auto reseting is not allowed. supper dangerous if you are in an Ac panel trying to figure out why its' dead and the power turns itself back on.

now the smart cord has no temp cut off. it's still sold but there is no longer any smarts in it... now it's just a cord.
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Old 27-11-2022, 00:32   #86
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Step down transformer for isolation on boat.

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north america introduced a shore cord (smart cord) that would cut out if it got to hot, it was auto reseting. they got stopped shortly after because auto reseting is not allowed. supper dangerous if you are in an Ac panel trying to figure out why its' dead and the power turns itself back on.



now the smart cord has no temp cut off. it's still sold but there is no longer any smarts in it... now it's just a cord.


The less said about US shore power cords the better , standard work practices demand manual and flagged isolation of supplies that are been worked on. You can. Be held legally liable otherwise.

As I said my pillar has self resetting RCBOs. It also has auto disconnect on plug removal and a whole bevy of RCBOs. Much safer then any Us pillar.

U.K. marina code will Likely mandate pillar based isolation transformers in the next iteration. They are strongly recommended today

There is a lot to be said that boats should be treated as building sites !!! ( ie 110 vac)
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