documented proof that aluminium bus bars are better than aluminium cables

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a wire in which bulb is connected there is two terminal when one terminal is connected to phase than why the value of current shock in nutral terminal is max. or large??

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What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works?

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what are the types of control systems to control the speed of the motor??

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i am completed in B.E(Electrical and Electronics Engineering) with 8 months experience in Quality Control Engineer at Bharathi Industries,Coimbatore.

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