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    billyfri's Avatar
    billyfri Posts: 1, Reputation: 1
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    #1

    Jun 18, 2011, 02:38 PM
    NEC
    What is an autotransformer
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jun 19, 2011, 03:12 AM
    How does the NEC relate to autotransformer?

    From Merriam-Webster dictionary:

    Definition of AUTOTRANSFORMER
    : a transformer in which the primary and secondary coils have part or all of their turns in common

    These have specific purposes, why do you ask?
    Chris.w197's Avatar
    Chris.w197 Posts: 2, Reputation: 1
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    #3

    Jun 19, 2011, 08:46 AM
    An auto transformer is a transformer that only has one coil. It still has a normal input and output and works just like a normal transformer. It is cheaper and lighter but has the drawback that under fault conditio0ns the supply voltage can appeare at the output. EG a 110v:12v autotransformer could give an output of 110v if a short occurs! They are normally used where a slight change in voltage might be needed say to boost voltage at the end of a long line when higher load is present! This url might help!

    http://www.allaboutcircuits.com/vol_2/chpt_9/5.html
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