I was hooking up a ground wire in a panel and i seen a small spark when i touched it to the ground bar also i was tightning the screws on the neautral bar and my screwdriver touched the side of the panel and made a big spark is this normal??
Stan, Was this in the main panel or a sub-panel? There may be a small arc between the grounding and grounded conductor in a sub-panel due to the voltage drop that will occur in the grounded conductor? Don(resqcapt19)
This is not unusual, you created another path to ground. The Neutral and a ground share the current back to the transformer. Because the neutral has significantly lower resistance that the ground it will carry the bulk of the current say from 90-95 % of the current but by connecting a ground to the neutral bar it just ccreated another path.