. Also, keep in mind the above is merely an example.
Ron

I notice in the example PDF posted in #37 that the shore earth ground is never connected to the vessel supply neutral or ground.
Max.

 

Thanks Ron,
My neutrals from Transformer and Generator are switched with the hot leads on a big (expensive as I recall) rotary selector switch before leading to a neutral bus bar. Not good?

A boat s quite different from a house and thus there are different considerations. Also, the transfer switch was probably ALSO intended to work with 3 phase power and so it had 3 poles. And all of them were use. That way the shore power cord is totally dead when it gets plugged in, which is a quite good idea.

 

I notice in the example PDF posted in #37 that the shore earth ground is never connected to the vessel supply neutral or ground.
Max.

Yeah, that is sort of interesting. I am not 100% as to all of their logic in Marine applications but can see where Isolation is a key player. You start looking at 15 KVA isolation transformers they get expensive and weigh in around 250-300 Lbs or 114 to 136 Kilos. Most of what I have found seems to reflect total isolation and what becomes Neutral off the transformer is not switched.
I do know something was very, very wrong in the link I provided earlier where the kid who jumped into the lake suffered electrocution.

Ron

 

I do know something was very, very wrong in the link I provided earlier where the kid who jumped into the lake suffered electrocution.

Did you see the warning in one of the official publications that no-one should consider swimming or entering the water where shore powered vessels were moored?
Max.

 

Goo

Thanks Ron,
My neutrals from Transformer and Generator are switched with the hot leads on a big (expensive as I recall) rotary selector switch before leading to a neutral bus bar. Not good?

Good news to report! Replacement Isolation Transformer is working

Yeah, that is sort of interesting. I am not 100% as to all of their logic in Marine applications but can see where Isolation is a key player. You start looking at 15 KVA isolation transformers they get expensive and weigh in around 250-300 Lbs or 114 to 136 Kilos. Most of what I have found seems to reflect total isolation and what becomes Neutral off the transformer is not switched.
I do know something was very, very wrong in the link I provided earlier where the kid who jumped into the lake suffered electrocution.

Ron

Good news to report! The new transformer is working as advertised. There was very little blood loss during the cabling. I would like to thank everybody once more for the support. Tomorrow, I try the inverter/transfer switch.....

 

Yeah, that is sort of interesting. I am not 100% as to all of their logic in Marine applications but can see where Isolation is a key player. You start looking at 15 KVA isolation transformers they get expensive and weigh in around 250-300 Lbs or 114 to 136 Kilos. Most of what I have found seems to reflect total isolation and what becomes Neutral off the transformer is not switched.
I do know something was very, very wrong in the link I provided earlier where the kid who jumped into the lake suffered electrocution.

Ron

EVERY instance like that, I have read about 3 of them, was from "AN ELECTRICAL SYSTEM WITH GROUNDED NEUTRAL", such that a single conductor provided the lethal hazard to a grounded person. In a CORRECTLY isolated installation contacting a single energized wire will not deliver a dangerous shock. It takes TWO connections to establish a circuit and have current flow. That is a primary reason for having isolation transformers.
In addition, while it would be great if every outlet in every marina in the world had a correctly tied neutral and ground connection, I am certain that there are a few exceptions. And the exception can be a shocking discovery.

 

Glad it all came together and worked out for you. Now just enjoy, well as soon as the spring thaw comes anyway.

Ron

 

Did you see the warning in one of the official publications that no-one should consider swimming or entering the water where shore powered vessels were moored?
Max.

Yeah, it was so sad when that went down. Actually right after connecting shore power the dog jumped in and the one teen kid saw the dog seemed in distress so he jumped in after the dog. Then he managed to blurt out what sounded like "electricity" as he was in distress and the father jumped in along with a brother. Now I am not 100% but I think where they were is a state marina and not privately owned. Initially the claim was shore power wiring was correct and there was never a follow up as to what actually went wrong. Pretty sure I have been in that marina but never on anything large enough to use power.

Ron

 

Post #45 reports success, but does not tel us just HOW MUCH success. So we arelooking to hear if every function performs as specified.

 

Post #45 reports success, but does not tel us just HOW MUCH success. So we arelooking to hear if every function performs as specified.

Yeah but I try to be optimistic.

Ron

 

Yeah but I try to be optimistic.

Ron

Ron, Your optimism has been validated I hooked up the Outback inverter this morning and its transfer switch is back to working as it should.
How very odd, for some reason, it just didn't like the direct shorepower.
As far as I know, everything is back to normal. (except the owner)
I would buy the house a round if I could!

duncan

 

Hey Duncan,
Just glad things came together for you. During my entire career I never actually saw a large transformer fail. I have seen a few large failed transformers just nothing ever up close and personal. Hell I remember one weekend I worked maybe 20-25 years ago just so we could do some D&C (Dusting and Cleaning) inside one of our small sub stations. Two large transformers and one had a 1953 date code and the other 1954, I remember thinking I was 3 and 4 years old respectively when they were made. That part of the building was maybe mid to late 50s. Transformers generally just sit there and buzz. I was never real fond of working in any of the sub stations.

Anyway, just happy things came together.

Ron

 

OK, it is great that whatever problem there was has not come back. But it does make for an uneasy feeling not knowing what was wrong.

 

Hey Duncan,
Just glad things came together for you. During my entire career I never actually saw a large transformer fail. I have seen a few large failed transformers just nothing ever up close and personal. Hell I remember one weekend I worked maybe 20-25 years ago just so we could do some D&C (Dusting and Cleaning) inside one of our small sub stations. Two large transformers and one had a 1953 date code and the other 1954, I remember thinking I was 3 and 4 years old respectively when they were made. That part of the building was maybe mid to late 50s. Transformers generally just sit there and buzz. I was never real fond of working in any of the sub stations.

Anyway, just happy things came together.

Ron

OK, it is great that whatever problem there was has not come back. But it does make for an uneasy feeling not knowing what was wrong.

 

Maybe I’ll go buy a couple more smoke detectors

 

OK, it is great that whatever problem there was has not come back. But it does make for an uneasy feeling not knowing what was wrong.

While I agree I think we have all seen similar at one time or another. We have chased symptoms and sometimes we never do find a cause. I figure it this way, sometimes things are systemic and sometimes random. Right now things are working as they should making it difficult to troubleshoot. If something goes amuck again then there is something to look for, if not then there is nothing to look for. Can't fix it if it ain't broke.

Ron