Should I call 911 if a frayed power line fell in my driveway?
Do not call 911, call the power company. If your city has 311 service you could call that. If there are any bodies around the line just leave them be. Don't try and move them with a broom handle, that's an old wive's tale.
No, call the power company.
Leave 911 for emergency calls. You should call the power company. Do not approach the cable, and if it is in water, do not step into it !
Call the power company. Make sure you do not touch the line. Do not allow your children or pets near the line. There is nothing the police can do so calling 911 is not appropriate.
IF your sure it's power cable inform the police, they'll handle it from there. Otherwise call the power company.