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mains current [amps]reading

Discussion in 'General Electronics' started by pageshiner, Jan 9, 2004.

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  1. pageshiner

    pageshiner Guest

    who's in charge here,how do I take a current reading from the mains
    without blowing up my meter,remember we are 240v rms,13 amp over
    here.Ive tried once and now one of my test probes looks like I have
    been welding with it,I had the meter set to amps a/c not milli or
    micro and put the black probe to the neutral and the red to the live
    and nothing happened think I caught the earth on the way out and it
    went with a bang,thats as far as I got.
  2. scada

    scada Guest

    Your lucky your here to talk about it! Current measurements are taken with
    the metering in SERIES with the load. Never across (Parallel) to the load,
    that puts a direct short on the main! in your case, you can not put your
    meter in series with the main either! You need a "Clamp on" ammeter. Such a
    meter has a squeez handle that allows its Jaws to go around one conductor.
    The reading is read on the meter through induction. If you are not certain
    of what you are doing, Don't Do It! You will only hurt yourself, or others!
  3. JeffM

    JeffM Guest do I take a current reading from the mains
    Disconnect wire from output of circuit breaker
    .. /
    Main +----+ / wire to outlet
    ------| |--+ ------
    | CB | | |
    | | | | Connect Ammeter between breaker outut and wire to
    +----+ | |
    | |
    | Meter |
    | |
    All the current must pass THRU the meter.

    A much better way to do this is with an amp-clamp.

    My question is, "How have you managed not to kill yourself so far?".
  4. Ken Taylor

    Ken Taylor Guest

    Power in UK is 240VAC, but the current is determined by the load. You
    measure current in series with the load, not by putting your leads across
    the mains. You've probably blown up the meter too. Get an electrician to
    measure it for you if it's important.

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