I would caveat that with "all of the standards", at least with respect to electricity. In other words you really need to understand the whole system and the standards applying to each piece.
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Thread: Wiring isolation transformers
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01-19-2021 10:52 AM #11Senior Member
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Re: Wiring isolation transformers
Prometheus
1978 53' MY Hull #529
Viera, FL
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01-19-2021 12:45 PM #12
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Re: Wiring isolation transformers
Who makes isolation transformers, now? I had the impression Charles was out of that market, but perhaps my memory is mistaken.
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01-19-2021 09:13 PM #14
Re: Wiring isolation transformers
Defender still has some Charles units in stock.
Robert
MANCHIONEAL
1973 43DC #365
Mattox Creek, VA
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01-19-2021 09:22 PM #15
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Re: Wiring isolation transformers
Eric
41TC 1966 Hull #53 "Requisite"
Kent Island, MD/Ft. Lauderdale, FL
"Though she creaks - She holds"
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01-20-2021 02:01 PM #17Senior Member
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Re: Wiring isolation transformers
FTFD... i drive a slow 1968 41c381
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01-20-2021 04:13 PM #18Senior Member
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Re: Wiring isolation transformers
But does your average transformer have an electrostatic shield between the coils to use as a ground?
11.9.1.1. A metallic shield shall be located between the primary and secondary winding and be electrically insulated from all other portions of the transformer.
It shall be designed to withstand, without breakdown, a high potential test of 4000 volts AC, 60Hz, for one minute, applied between the shield and all other components such as windings, core, and outside enclosure.
11.9.1.2. A separate insulated wire lead or terminal identified as the shield connection is to be solidly connected only to the shield, and brought out for external connection
and shall be equal to or greater than the aggregate circular mil area of the largest transformer phase conductor(s).
11.9.1.3. The shield and its connection are to be of sufficient ampacity to provide a sustained fault current path for either the primary or secondary windings to ensure operation of the main shore power disconnect circuit breaker when subjected to a fault current level in accordance with ABYC TABLE V - B.
Prometheus
1978 53' MY Hull #529
Viera, FL
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Re: Wiring isolation transformers
The Charles Marine units seem to cost roughly the same as Victron units I found for sale on line. And Charles is out of the transformer business; the units at Defender are closeouts. I think I'd buy Victron, in that instance. The ones from Bridgeport Magnetics are smaller and more compact. The prices of these seem to be coming down, good news esp if you have two incoming shore lines of 30A each, as I do, so I would need two transformers.
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01-23-2021 09:38 AM #20Senior Member
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Re: Wiring isolation transformers
Yes, I believe so. See this: https://electrical-engineering-porta...on-transformer
"Marine isolation" transformers are not anything specials. The "isolation" transformers that I've seen on a few hatts are just off the shelf step up/down dry type transformers that you would find in any commercial building. They were off the shelf units. Ask a few people to post up pics of the data plate on their Hatt transformers.
Boat people always want to think boats are special, and thus require special laws of physics, haha.
Another nerd link: https://canadatransformers.com/what-...static-shield/Last edited by krush; 01-23-2021 at 09:43 AM.
FTFD... i drive a slow 1968 41c381