i recently answered a call on a 3 phase 480 volt battery charger. the charger was being replaced and the tech was shocked when he tried to do this. it turns out there were 3 chargers in a row and a 3/4 inch pipe feeding the three chargers. all of them wired with no. 12 wire and each were on their own 20 amp breaker. each charger was wired with the familair brown orange and yellow wires with a ground. what i found was during the installation one of the orange wires from lets say charger a was mistakenly pulled into charger b and the orange wire from charger b was in charger a. when the tech turned off the circuit breaker for charger a, all the indicator lights on the face of the charger went out and he thought everything was fine so while disconnecting the charger he found out differnt. now this is not going to be one of those posts where people should chime in and tell everyone about how many violations there are here. what this is intended to do is inspire all of us to use our testers before touching any wire. so when we see the flashing l.e.d. lights go out after turning off a circuit breaker we stll have to use our testers to make sure it is safe to work on. remember what happens when we assume somthing.:?