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    I bought a Greenlee Basic Electric Kit yesterday. It contains a GT-11 non-contact Voltage Detector (CAT IV), GT-10 Polarity Cube and DM-20 MINI Digital Multimeter.

    The Digital Multimeter is for CAT I and CAT II applications. My question is that do all applications inside my house belong to CAT II or CAT I? I am wondering if I can use the multimeter in all my devices and also the Main Electrical Panel?



  • #2
    Re: electrical tool kit question

    Flule has a great explanation of the categories assigned to meters and other test equipment. You can find it at
    When seconds count, the police are only minutes away.


    • #3
      Re: electrical tool kit question

      Thank you for your link. I read that article. It looks like the main panel belongs to CAT III from that article. Am I right? But I don't know if the main panel inside a residential property is different from a commerical property or not?


      • #4
        Re: electrical tool kit question

        Anything and everything at your home is Cat1 or Cat2. Cat 3-4 are for 3 phase industrial or commercial applications.
        info for all: --- "I like long walks, especially when they are taken by people who annoy me."