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Old 11-12-2021, 03:30 PM   #1
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Isolation transformers

Has anyone had any experience with this brand??

Looking at the output side in there diagram. They leave the ground disconnected. So I emailed them saying that white and ground should be connected if if the black/hot wire when to ground than the breaker would not trip.

In their response, "Yes. Connect White output lead to boat ground." Plus no galvanic isolator would be needed. From what I have been reading, one would be needed. Any thoughts?

https://www.bridgeportmagnetics.com/...-transformers/
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Old 11-12-2021, 04:04 PM   #2
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There are usually two grounds on marine isolation transformers (220V). One is for the primary winding wires going to shore power. Two split phases used only on primary, no neutral.

The other ground separates the primary winding from the secondary winding and needs to be connected to the secondary neutral wire (usually a center tap in the secondary wire). The primary and secondary grounds do not get connected. No galvanic isolator should be used.

For a 120V isolation transformer, there would be only one ground and it gets connected to secondary winding neutral. Again. no galvanic isolator should be used.

With isolation transformers, stray currents will return to the secondary winding not to the shore pedestal. That is the whole point of an isolation transformer.
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Old 11-12-2021, 05:09 PM   #3
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Originally Posted by Iggy View Post
Has anyone had any experience with this brand??

Looking at the output side in there diagram. They leave the ground disconnected. So I emailed them saying that white and ground should be connected if if the black/hot wire when to ground than the breaker would not trip.

In their response, "Yes. Connect White output lead to boat ground." Plus no galvanic isolator would be needed. From what I have been reading, one would be needed. Any thoughts?

https://www.bridgeportmagnetics.com/...-transformers/
I believe you have miss interpreted their schematic. The ground being not used and capped off is internal to the puck. Look past the dashed circle and you will see the Black, White, and Green wires that you will be working with.
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Old 11-12-2021, 05:12 PM   #4
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What intrigues me most about this system is a 50A 125/240v system only weighs 150 lbs. this is 100 lbs. less than any other system I have reviewed. I am seriously considering this system. I'm just looking for some feed back from some one who is currently using it.
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Old 11-13-2021, 05:23 AM   #5
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I believe you have miss interpreted their schematic. The ground being not used and capped off is internal to the puck. Look past the dashed circle and you will see the Black, White, and Green wires that you will be working with.

From the shore cord, yes the ground is capped off/not used. Yes, I see the wires after the dashed circle. But not sure what you are driving at?

Now they e-mailed me back stating to connect the white and green on the output side. I did quote them, maybe I am not understanding them?

The other reason why I am thinking of instilling these is. My galvanic isolators are 20 years old, so they don't meet ABYC standards anymore.
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Old 11-13-2021, 09:03 AM   #6
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Originally Posted by Iggy View Post
From the shore cord, yes the ground is capped off/not used. Yes, I see the wires after the dashed circle. But not sure what you are driving at?

Now they e-mailed me back stating to connect the white and green on the output side. I did quote them, maybe I am not understanding them?

The other reason why I am thinking of instilling these is. My galvanic isolators are 20 years old, so they don't meet ABYC standards anymore.
What problem are you trying to solve? A new, compliant Promariner 60-amp galvanic isolator costs about $300. I took a look at Bridgeport Magnetics website, quite interesting but no indication of what their solutions cost versus an isolator.
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Old 11-13-2021, 10:41 AM   #7
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i have a bridgeport magnetics mp3.6 on my steel boat. i don't think that their system exactly meets the requirements for aybc certification for marine installations. i don't know if i'd bought a different one after i investigated more thoroughly, but i may have. i got the one i have from an ebay listing.
when i bought the pair of transformers i needed for my new to me boat i got the victron energy units.
i think bridgeport meets the european standard, i thought i read that they thought it was a better method than the usa standard.
bridgeport units are certainly smaller, that's for sure. works fine, no heat from it, it does buzz a little. i am going to add some rubber isolators to hopefully reduce that some. i mounted it in the forward berth area so it was within the wire length requirement to the shore inlet/distribution panel. the buzz is a little annoying in the bunk if there's no other white noise.
their installation says to leave the ground from the shore cord terminated at the shore inlet, don't bring it to the transformer. you create the ground/neutral connection for the boats distribution in the wiring cavity. i can't remember if there was an accessible shield connection or not, but i don't think so. the case is all plastic too so a case ground does nothing.
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Old 11-13-2021, 11:24 AM   #8
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On the back side of your shore power socket you will have an output for green, white and black. You won’t use the green. You connect the white and black to the puck. The puck outputs red&black these connect to the boats L1, white & yellow these connect to the boats neutral and ground, . At this point your boat is properly grounded and you are not connected to shore ground. This prevents any stray DC from entering your boat via the ground wire.
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Old 11-13-2021, 11:36 AM   #9
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Originally Posted by tiltrider1 View Post
On the back side of your shore power socket you will have an output for green, white and black. You won’t use the green. You connect the white and black to the puck. The puck outputs red&black these connect to the boats L1, white & yellow these connect to the boats neutral and ground, . At this point your boat is properly grounded and you are not connected to shore ground. This prevents any stray DC from entering your boat via the ground wire.
that's exactly how it hooks up. i think you can decide whether or not to hook the ground to neutral at the puck, or at the distribution panel. either way it does the same thing, and you have isolation.
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Old 11-13-2021, 11:45 AM   #10
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Originally Posted by tiltrider1 View Post
What intrigues me most about this system is a 50A 125/240v system only weighs 150 lbs. this is 100 lbs. less than any other system I have reviewed. I am seriously considering this system. I'm just looking for some feed back from some one who is currently using it.
like i mentioned, i'm using the 3.6 version. is there something specific you need to know about it?
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Old 11-13-2021, 11:56 AM   #11
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Bmarler I was trying to answer Iggy’s question about wiring.

My question to you is does it work as advertised? Losing a 100 lbs. is significant, I need a 50a 125/250v unit. I can locate the unit in the engine room so a bit of buzzing is probably tolerable.
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Old 11-13-2021, 12:41 PM   #12
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Regarding grounding with isolation transformers

The thing you do NOT want to do is to create a ground path from your boat to your shore power cord. That is exactly what you are trying to prevent.

On my Charles Industries Isolation Transformers the metal case of the transformer is connected to shore power ground, but that case is not connected to anything in the isolation transformer, it is just the case. If these transformers use a plastic case then no ground connection would be needed.

My only challenge with these or any isolation transformer is hanging them on a vertical surface. You would want that surface to be really strong because boats move and you need to consider the loading forces.
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Old 11-13-2021, 02:07 PM   #13
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Originally Posted by tiltrider1 View Post
On the back side of your shore power socket you will have an output for green, white and black. You won’t use the green. You connect the white and black to the puck. The puck outputs red&black these connect to the boats L1, white & yellow these connect to the boats neutral and ground, . At this point your boat is properly grounded and you are not connected to shore ground. This prevents any stray DC from entering your boat via the ground wire.
I am not seeing the White and ground connected! As I have been mentioning.

They are advertising, UL Marine listed. Is that as good as ABCY, not sure?
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Old 11-13-2021, 03:05 PM   #14
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Originally Posted by tiltrider1 View Post
Bmarler I was trying to answer Iggy’s question about wiring.

My question to you is does it work as advertised? Losing a 100 lbs. is significant, I need a 50a 125/250v unit. I can locate the unit in the engine room so a bit of buzzing is probably tolerable.
got it, sorry for the confusion.
to answer your question, yes, it works perfectly. it makes all the power my shore breaker will allow with no voltage drop. it's about the simplest isolation transformer you could get, and the small size is bonus too.
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Old 11-13-2021, 03:29 PM   #15
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Regarding grounding with isolation transformers

The thing you do NOT want to do is to create a ground path from your boat to your shore power cord. That is exactly what you are trying to prevent.

On my Charles Industries Isolation Transformers the metal case of the transformer is connected to shore power ground, but that case is not connected to anything in the isolation transformer, it is just the case. If these transformers use a plastic case then no ground connection would be needed.

My only challenge with these or any isolation transformer is hanging them on a vertical surface. You would want that surface to be really strong because boats move and you need to consider the loading forces.
Kevin, I am so disappointed in you today. I see no reason why the Puck can not be mounted in a Horizontal surface. For me the biggest challenge is the input wires come out of the back of the Puck and the output wires come out of the side. This mean I need to mount it with a spacer so that it is not flush to a surface. Maybe you need to do this anyway for air circulation.
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Old 11-13-2021, 03:31 PM   #16
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I am not seeing the White and ground connected! As I have been mentioning.

They are advertising, UL Marine listed. Is that as good as ABCY, not sure?
you make the neutral/ground connection yourself. i did it at the back of the transformer as it's now the new power source, but an argument could be made for doing it at the distribution panel.
i think the only thing that disqualifies it as abyc compliant is the lack of a metal case, and possibly the lack of an accessible faraday wire.
the ul marine cert and the european cert is good enough for me. the surveyor i talked to about it was perfectly fine with it too. i think the plastic case is a good thing, nothing to rust or short out on.
they recommend hooking a small light bulb on the input to help reduce nuisance tripping when you first energize it but i don't have any issue with that.
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Old 11-13-2021, 03:36 PM   #17
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Iggy,

I'm not sure where the confusion is. Possibly I'm not understanding your thought process. The schematic shows the puck's white & yellow wire being connected to the Boats neutral and ground wires. I'll admit they are a little sloppy in showing the connection in the schematic but it is there none the less.

If I was doing this I would wire the puck's white & yellow straight to a bus and bring the boats neutral(white) and ground(green) to this same bus. I should rephrase that a bit. I would run the wires coming from the puck to a double pole breaker and then to the appropriate buses.
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Old 11-13-2021, 03:38 PM   #18
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Quote:
Originally Posted by ksanders View Post
Regarding grounding with isolation transformers

The thing you do NOT want to do is to create a ground path from your boat to your shore power cord. That is exactly what you are trying to prevent.

On my Charles Industries Isolation Transformers the metal case of the transformer is connected to shore power ground, but that case is not connected to anything in the isolation transformer, it is just the case. If these transformers use a plastic case then no ground connection would be needed.

My only challenge with these or any isolation transformer is hanging them on a vertical surface. You would want that surface to be really strong because boats move and you need to consider the loading forces.
i thought abyc required the shield wire to be connected to the shore ground, and the case connected to boat ground.
the victron ones i just bought provide terminals for all of the connections, i haven't seen the charles industries ones.
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Old 11-13-2021, 04:00 PM   #19
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i should add, in regards to these puck transformers from bridgeport. there are marine electricians that do not recommend them for installation as an isolation transformer due to the lack of an accessible shield wire to connect the shore side safety ground to.
these pucks almost qualify as polarization transformers but they don't have a metal case.
i have read plenty of opinions and reasons for the abyc and the european standards and how they differ, and in the end i decided i could live with any potential risk in my particular installation.
do your own research though before you purchase.
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Old 11-14-2021, 06:52 AM   #20
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Thanks for all the feed back! I am looking at the MP3.6
using https://www.bridgeportmagnetics.com/...ales-sheet.pdf

Maybe am nuts! I am not seeing ground wire connected to the white wire. Now Kevin said that "you make the neutral/ground connection yourself." Which is great in it self. It should be connected.

For the person that does not know any better, the PDF is wrong.
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