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The Megger test

Discussion in 'Technical Discussion' started by dikikh.dm, May 8, 2015.

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  1. dikikh.dm, May 8, 2015
    #1
    dikikh.dm

    dikikh.dm New Member

    Joined:
    Apr 22, 2015
    Messages:
    22
    Location:
    Malta
    Good morning colleagues,

    There's a need to carry out the megger test, in particular, to make sure that the insulation of the electrical equipment from the earth (the boat's hull) is good enough.
    Could somebody advice me if I understand this procedure correctly:
    1. Since we have only low voltage equipment onboard (220 and 400V), as I understand I can use the lowest megger check voltage.
    2. I switch off the breaker of the equipment I want to check.
    3. I connect the positive wire (crocodile) of the megger to the earth (the metal door of the junction box) and the negative one to the phase wire of the equipment.
    4. I activate the megger tester, check the reading and repeat it for all phase wires.

    Is it right?

    Thanks in advance.
    Best regards.
  2. K1W1, May 8, 2015
    #2
    K1W1

    K1W1 Senior Member

    Joined:
    Sep 30, 2005
    Messages:
    7,427
    Location:
    My Office
    Google How to megger test my motor and watch a few videos till you understand what megger testing is.

    Given that you obviously think you have an idea and you are going to test every phase between itself and ground not the other phases and will use a moving hinged door as your earth point I
    would also suggest you ask someone who knows what they are doing to show you.

    It will be safer for you and everybody else close by and probably a lot cheaper in the long run.