Field issues we've found and fixed.

In this photo you'll see a sub-panel that was added in one of our customers basements.  The previous owner installed this panel to serve a finished basement done without permits.  Per the National Electrical Code, ground and neutral wires should be isolated in sub panels so that electricity has only one way to travel preventing inadvertent energizing of metal parts.  In this picture the path for the neutral and ground have essentially been reversed allowing a potential for electrical shock on any attached metallic parts on the electrical system.  The Ground bar identified by the green bonding screw on the left of the panel has all the neutral conductors attached, and the grounds are connected to the isolated neutral bar.   wired in this manner, electricity actually has to make its return path through the green screw back using the grounding system rather than the insulated neutral wire.  During a service change we found this and installed one new electrical panel capable of handling all the loads in the house safely.  This was an extreme shock hazard!