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T&T: Debugging an electrical problem

From: Richard P Blake (no email)
Date: Wed Aug 01 2007 - 17:08:47 EDT

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    We we are on shore power (50A), we get enough power to power everything
    on the boat (including dual air conditioners at the same time) except
    the electric stove. The electric stove will sort of power on, but the
    burners never get very hot and the LED "On" light does not light

    REPLY: Greg,
    You have not said if the stove is 240 VAC or 120 VAC. But if everything
    works on the genny and has worked at other marinas your stove is probably
    240VAC along with your hot water heater. I would bet that the two
    120 VAC lines that are feeding your 50 A socket on the dock are of the
    same phase. If you measure the plug at the dock there should be 120VAC
    between phase #1 and ground and phase #2 and ground. You should measure
    240VAC between phase #1 and phase #2 which would mean that phase#1 and
    phase#2 are 180 degrees out of phase which is the correct why to wire the
    plug.
    The genny is supplying the two lines out of phase so all 240VAC and
    120VAC
    will work correctly. The dock is only supplying two 120VAC in phase so
    all
    120VAC work fine but all the 240VAC devices do not work properly as
    they are only getting half the voltage required. BTW this condition can
    cause
    damage or fires to some 240VAC devices (especially motors) if left trying
    to
    operate to long this way. Hope this helps!!!!!!

    Regards, Rick Blake
    "Private Reserve" Port Charlotte, Fl.
    36' Nantucket Sedan Powered by Yanmar
    "Life's journey is not to arrive at the grave safely in a well preserved
    body,
    But rather to skid in sideways, totally worn out, shouting...'Holy
    S**t...What a Ride!"
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