Electrical Wiring ?

** Groper Alert !

** Why should it ?

The step down transformer provides "galvanic" isolation for the 220 volt secondary - so it can be connected ( at one end) to any thing you like, including earth.

** Long as you don't touch the 220 volts terminal - yes.

....... Phil

An earth leak (ground fault) breaker trips on ground current above some limit. This happens when a circuit is completed through ground. This takes two ground connections, one where the current enters ground and one where it comes back out to the voltage source. If your 220 is produced by an isolated transformer winding, it has no earth connection. You can ground one side of that winding to define the voltage on the other end of the winding with respect to ground. This is called neutralling the secondary. If the

440 passes through a ground fault breaker, and is also neutralled somewhere up stream, and the 440 to 220 step down transformer developed an insulation fault, there would be a ground fault circuit completed (ground would be a current path between the two places it was connected to the 440 volt source) and the ground fault breaker would trip off. Also, if the 220 volt hot line developed any leakage path to ground through any of the control devices or wiring, there would be two connections to ground across the 220 volt winding, and, if the ground fault breaker was installed on the 220 volt pair, this ground current would trip the breaker off. In effect the second ground connection would detour some of the line current from the hot side back to the transformer through the two ground connections (the fault and the neutral connection). The ground fault breaker detects that there is a difference between the current going one way in the hot line than is returning through the neutral line, and concludes that current most be escaping through some additional ground connection, and trips off.