[folivier]

A bit off topic but when I plugged into our lot in Colorado one spring I could only get power from one leg of the breaker box. With no load it tested at 120vac on each leg but with a load the bad leg would drop down to 30-40 vac. Found out that the phone guys had dug a hole when they connected us and nicked one of the aluminum supply wires. This is the piece they cut out and repaired:
   

Same as Richard's wire above, but completely turned to aluminum oxide.