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Answer Posted / lalit narayan mahto
the first region,
all the electrical surges and noises are
+ve in nature, when we give -ve polarity then negative
supply nutralies these noises & surges thus reducing false
triggering effect.
the second region,
By usig negative polarity the cable does'nt
rusted or oxidized thus remains for longer life, but cable
dia get reduced in 15 to 18 month, so cable will be change.
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