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The Norfolk Broads Forum / Broads Boat Owners Q & A / Electric's installation
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Posted By Discussion Topic: Electric's installation

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Gas Installation Advice| Is your gas installation safe?| Heater installation| Eberspacher Heater installation| Eberspacher Heater installation| 240v Installation Info and Advice Please|

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pargeandmarge
Sep-27-2020 @ 2:29 PM                           Permalink
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Hi Adi
A bit of a farmers chip in is this.
Our boat before we bought it was on shore power for a long time.
The shaft in the raw water pump was corroded badly and the pintail end was rotted away along with the tail end of the skeg.
Advice from a professional on the raw water pump damage was due to electrolysis.
I never asked an opinion on the stern gear just replaced it.

Then in another story not wishing to bore anybody or say something that somebody else has already said in this thread or in any other place at any time. We moored at Ranworth on the front between two large boats all of us plugged to shore power. I turned our immersion heater on and felt a static shock like a tingling around the switch left the switch area went back and still the same tingling, so disconnected from shore power. In the morning we were not the first away so I re connected shore power with both boats beside me gone and no tingle around my immersion switch.
I had the ring main checked by a professional and it was tested all signed off as good A1.
Since then I have always used a galvanic isolator and obviously moored in a lot of different situations. Since using this isolator I have never had the static around the immersion heater switch.
There will be someone out there hopefully Anville as normally he knows whats happening and why.
Its only farmers science but it works for us.
Kindest regards
Marge and Parge.

PS I was a farmers boy, not a farmer now but wish I was  Smile

spiderman
Sep-27-2020 @ 3:53 PM                           Permalink
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A tingle around my immersion....Those were the days  Wink

pargeandmarge
Sep-27-2020 @ 4:19 PM                           Permalink
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LOL LOL LOL
Regards
Marge and Parge

annville
Sep-27-2020 @ 5:19 PM                           Permalink
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Hi Marge i won't give you the technical reason as not high tec myself but metal quay heading can make it worse and as earth and negative battery are wired together on a boat you can get a feedback if not a galvanic isolator isn't present one or both of the other boats didn't have one either. a immersion heater resistive it is not sensitive like most electrical items and is wired straight through they will still heat up on 50 volts or be it take longer that's why they run well of off solar systems.John

ADI
Sep-27-2020 @ 8:01 PM                           Permalink
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After reading the last post I think a galvanic isolator is definitely the way to go, if its going to protect against shocks and tingles.

Regards

Adrian  Michelle

Beck  Braydon and Mere.

annville
Sep-28-2020 @ 6:09 PM                           Permalink
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Hi Alde You still need a RCD in 240 power surply THIS is what protects you from high voltage shocks a fuze protects the wiring and appliance heat/fire. John

ADI
Sep-28-2020 @ 8:28 PM                           Permalink
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Of course maybe like this one bg-metal-consumer-unit-dual-rcd-6-mcbs

Regards

Adrian  Michelle

Beck  Braydon and Mere.

annville
Sep-29-2020 @ 10:38 AM                           Permalink
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Hi Adi That's a bit overkill but if your happy with it  I did say in earlier post that you don't have to have a metal house spec unit you can get much cheaper ones that are plastic that were house spec only allowed in sheds/garages etc   they changed the spec (EU rule) to metal they are the same inside but plastic much better on a boat you can make a hole if need be easier and they don't rust BUT metel still ok.John

hedgehog
Sep-29-2020 @ 11:15 AM                           Permalink
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As requested


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L'sBelles
Sep-29-2020 @ 11:57 AM                           Permalink
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Definitely! As a new boat owner myself (first post by the way)and having recently fitted shore power, I am surprised that a functioning galvanic isolator is not a requirement if you use shore power.
Much is made of anodic corrosion with outboards and other metalwork disappearing etc. but water is conductive and without a galvanic isolator your mains earth shall be connected to everyone else's that are in close proximity. Therefore if a fault develops on someone else's boat you get to share it through your earth connection if you do not have isolation installed.
As stated in other posts, the additional cost of fitting the isolator is small fry in comparison to the expense of owing your own boat so why would you not want to protect your investment and yourself?

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