Welding a steel craft whilst afloat - electrolysis?

Discussion in 'Metal Boat Building' started by LittleVlet, May 6, 2010.

  1. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 148, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    I don't know about Apex1, but my dog speaks it fluently.
     
    1 person likes this.
  2. capt littlelegs
    Joined: Apr 2010
    Posts: 237
    Likes: 8, Points: 0, Legacy Rep: -67
    Location: England

    capt littlelegs New Member

    I thought he was a Dutch mountain dog, must be barking mad to speak Welsh boyo! :)

    My dog, although he's a Staffordshire Bull terrier, he speaks fluent Essex, a growling dialect! :D
     

    Attached Files:

  3. capt littlelegs
    Joined: Apr 2010
    Posts: 237
    Likes: 8, Points: 0, Legacy Rep: -67
    Location: England

    capt littlelegs New Member

    Neg rep: Dogmas and clear signs of incompetence CDK

    Of course it's dogma it involves regulation and the law, something you clearly fail to understand, people like myself involved with design and installation of electrical systems cannot afford to experiment with their customers lives as you would. These systems are tried, tested and agreed around the world so if you think it's incompetance then you're a bigger fool than I thought you were! Why don't you write to all the electrical regulating authorities and tell them they are all wrong? :rolleyes: :D

    Your foolish schoolboy experiments will never sway me because apart from my own extensive experience I have been taught by people who understand and have the qualifications to prove it, unlike you who has nothing but a few stupid and ill thought out rogue ideas. You are not and never will be an electrician or an electrical engineer of any sort so please don't try to pretend so and tell my my job. This is not a subjective issue like politics or religion! Your continued arrogant fight against the world will give you a heart attack! Calm down dear, you will never in a millon years prove me wrong, get over it before you disappear down the hole you keep digging! :D

    You say you try to remain polite but the fact is you insult me on every post by challenging my knowledge and qualifications in every respect in order to present yourself as a knowledgable person, all you've done is prove the opposite! I take the discipline and responsibility involved very seriously but you wouldn't know anything about that. :(

    Leave your negative rep if you must have your petty and pathetic revenge, it says more about you but it can never hurt me, in fact I'll wear it with pride! :p

    Did you see the picture of my dog? Such a handsome fellow and far more intelligent than any amateur electronics geek! :D

    P.S. I'm going to copy your comments to a friend who is a college lecturer in electrical engineering to give him and his students a good laugh. :D
     
  4. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 148, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    By all means do so Littlelegs.
    How can this person be your friend? Because you installed him a bedside lamp? If he really is a college lecturer he will politely tell you it wasn't smart to enter this discussion when even Ohm's law is something you don't understand. Don't go to the battlefield without ammo!

    In my last job I was at the helm of a very innovative industrial electronics company from 1969 until I could afford early retirement in 1994. But feel free to call me an amateur if you like.

    I can almost smell your frustration, but the -20 rep. points may help other people to properly judge the value of your contributions.
     
  5. capt littlelegs
    Joined: Apr 2010
    Posts: 237
    Likes: 8, Points: 0, Legacy Rep: -67
    Location: England

    capt littlelegs New Member

    Ha ha you know my friend who works at the same department as my wife, don't be silly he'd install his own lamp and why would any electrician not understand Ohm's law when like me he's had to use it for fifty years? More silly coments from you! Follow your own advice, you are the one not smart trying to take irrelevent and incomplete readings or without proper equipment lol. :D

    So where in your illustrious electronics career did you ever design, install, study, train or qualify in any aspect of electrical engineering in particular single and three phase supplies, earthing and testing procedures? No, let me guess... you didn't, that was easy because you said you didn't and that makes you an amateur or really a non starter! :D

    I'm sorry to break this to you but electronics is only to do with equipment and is not the same as the more general electrical but whilst I know there is a bit of an overlap, even I used to dabble with earlier valve electronics with tv and radio etc. and covered it on college courses it doesn't qualify you for knowledge of best practice and regulation of electrical installations. Do you understand it is a completely different field? If you presume to know more than me why aren't you advocating safe electrics as is the norm? :rolleyes:

    Yes I'm frustrated that you continue to protest your lack of knowledge and are not man enough to admit you're wrong, give it a rest mate. All I'm going to get out of you is more stupid comments and if my neg rep that you gave me makes you feel better then good for you. It's hardly going to detract from my experience and qualifications is it? I think most people are intelligent enough to make up their own minds on technical content but I don't really care what anyone thinks on a forum, it means nothing, they can do what they like. You are boring and repetative so you can have the last word or fit of pique, then please do piss off and get a life! :rolleyes:
     
  6. finnracing
    Joined: May 2010
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Scotland

    finnracing Junior Member

    Gentlemen

    Please could i ask Capt Littlelegs & CDK to each post a wiring drawing of their ideal, safest 240vac shorepower installation on a 38ft yacht of GRP Construction using an isolation transformer.

    Many Thanks
     
  7. jonr
    Joined: Sep 2008
    Posts: 721
    Likes: 11, Points: 0, Legacy Rep: 57
    Location: Great Lakes

    jonr Senior Member

    With the isolation transformer, I'd use three wires in (ground the case but don't let it touch anything else) and two wires out. Add a circuit breaker and a GFCI (in case of a transformer winding failure) on the input side. Perhaps get a center tapped transformer so you can have 120VAC if you ever need it.
     
  8. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 148, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    Jonr already answered that, the GFCI and circuit breaker are also available as a single unit. I have no wiring diagram for you, there is no room for variations here.
    It would both surprise and disappoint me if Capt Littlelegs responds.
     
  9. jonr
    Joined: Sep 2008
    Posts: 721
    Likes: 11, Points: 0, Legacy Rep: 57
    Location: Great Lakes

    jonr Senior Member

    Agreed, I should have said a "circuit breaker/GFCI".
     
  10. finnracing
    Joined: May 2010
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Scotland

    finnracing Junior Member

    Gemtlemen

    Many Thanks
     
  11. finnracing
    Joined: May 2010
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Scotland

    finnracing Junior Member

     
  12. finnracing
    Joined: May 2010
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Scotland

    finnracing Junior Member

     

    Attached Files:

  13. jonr
    Joined: Sep 2008
    Posts: 721
    Likes: 11, Points: 0, Legacy Rep: 57
    Location: Great Lakes

    jonr Senior Member

    They discuss the issues that were discussed in this thread. They connect one side of the isolation transformer output to the hull (this becomes the boat neutral and ground) and then put a RCD in line with the output. They do not show a RCD/breaker in the input side (although they say a breaker is an option). Neither is what I would do, but they are supposedly the experts. Overall, if you aren't knowledgeable about electrical systems and the reasonable details they provided, I would get a local electrician to help. Electricity can be dangerous.
     
  14. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 148, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

     

  15. jonr
    Joined: Sep 2008
    Posts: 721
    Likes: 11, Points: 0, Legacy Rep: 57
    Location: Great Lakes

    jonr Senior Member

    To summarize the last two responses, use their drawing but add a circuit breaker/RCD on the input side. I prefer in a small watertight box on the dock (instead of inside the transformer case). The breaker should match your wire size.

    Testing can be done with a special testing plug. It has lights to indicate that neutral/ground/hot are correct and has a button to cause the RCD to trip. Breakers can be tested by overloading them a little bit with some load and see if they trip.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.