<P> In a polyphase AC system , an artificial neutral grounding system may be used . Although no phase conductor is directly connected to ground , a specially constructed transformer ( a `` zig zag '' transformer ) blocks the power frequency current from flowing to earth , but allows any leakage or transient current to flow to ground . </P>
<P> In a polyphase AC system , an artificial neutral grounding system may be used . Although no phase conductor is directly connected to ground , a specially constructed transformer ( a `` zig zag '' transformer ) blocks the power frequency current from flowing to earth , but allows any leakage or transient current to flow to ground . </P>
earth conductor provides a path to ground for
earth conductor provides a path to ground for
leakage or transient current
leakage or transient current