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Keith M

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Posts posted by Keith M

  5. Is it possible for a hand held oscilloscope to measure AC voltage directly

    in Boat Building & Maintenance

    Posted

    Yes of course its possible, its what oscilloscopes do. However due to mains voltages, I think this one falls into "if you have to ask how to, you shouldn't be doing it".

     

    The last time I had to use an oscilloscope was back in the late 70's and we always used a divider circuit

     

    Technology has advanced so much this is the reason for the question

     

    Keith

     

    Interesting. Yes, that's what oscilloscopes are for - have you got much experience of using one?

     

     

     

    huh.png

     

    Richard

     

    As you can see in post ten it is along time since I had to use a scope

     

    But back in the 70's I use one most days

     

    Keith

  9. Fuse/ fuse holder

    in Boat Equipment

    Posted · Edited by Keith M

    Following on from my 20a Sterling charger thread:

     

    I need to install a fuse on the DC cable between the charger and the batteries. 25 or 30a maybe? I've looked around, most of the spade type fuse holders seem to have quite spindly wire tails, despite being rated to 30a. There doesn't seem much point in running 6mm wire, which I've already done, then interrupting it with something thinner.

     

    Can anyone recommend a fuse and holder that would be suitable? Ideally something not too bulky, as things are a bit tight where I plan to install it.

     

    Thanks.

     

    Hello Gareth

     

    I will suggest a Maxi Fuse and holder for your installation

     

    Keith

  12. 230 V fridge

    in Boat Equipment

    Posted

    Yes I have to agreed

     

    But if the system has a good design and is well executed there is no problem

     

    If it can work well within a hire boat surely there is no cause for concern in the hands of a private boater

     

    Surely the same applies to a set of batteries going down?

     

    Keith

  14. 230 V fridge

    in Boat Equipment

    Posted

    I have worked for more than 30 years with Inland water ways craft electrical systems

    For the last 15 years I have not designed or installed a system which incorporates a DC fridge

    Spending nearly £1200 on two DC items will almost cover the cost of an Inverter or Inverter / Charger then there is the DC cable to consider normally 10 mm2 not cheap

     

    Always an AC fridge

     

    Keith

    • Greenie 2

  19. Changes to BSS regs for RCD's ?

    in Boat Building & Maintenance

    Posted

    If it genuinely related to an RCD, I thought they were not even a mandatory requirement of the BSS.

     

    I thought their use was "strongly advised" or similar - nothing more.

     

    "Flamingo" has fairly recently passed a BSS, and has an RCD unit that is fairly elderly, and in a plastic box.

     

    However one thing has now fallen into place in my mind that I did not understand until now. I recently tried to buy a small unit with RCD and Circuit Breakers in, similar to what "Flamingo" currently has, but found everything on sale, certainly in places like Screwfix, is now in massive great steel boxes, really far too big and clumsy to put in a narrow boat. I guess the above explanation says why this is......

     

    Screwfix will still supply plastic enclosure containing RCD and MCB's

     

    As an add on we have a new branch of screwfix in Hinckley before I could purchase any electrical installation items I had prove that I was a qualified electrician

     

     

    Keith

  25. Independent surveyor to oversee build

    in New to Boating?

    Posted · Edited by Keith M

    Surely a boat builder that builds fully fitted boats would have all these in place already, qualified fitters that would sign their work off for the RCD.

     

    I can see maybe employing a project manager with his team of experts if building a sailaway but not a fully fitted boat through a well established reputable boat builder.

     

    Maybe once the OP decides on a builder the builders points and reputation can be discussed by people who have had first hand experience with the chosen builder, until then there are many different scenarios and questions that can be brought up.

     

    During the coarse of a year I will inspect between 20 or 30 NB which all have RCD documentation stating the the electrical systems conform to the two EN ISO 10133 and 13297 in most case the vessel fail.

     

    Some on simply things and others on major items

     

    Such as using the hull as a conductor or not identifying which fuse is for what

     

    Keith

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