Where there's smoke...
 

Charred shore tie connectors are a leading cause of AC related boat fires.  The charring is a result of resistance build up (due to dirty contacts, poor connections, etc,) which generates heat and the potential for fire.  The problem is especially prevalent among livaboards who tend to continually run high energy loads such as hot water heaters and air conditioning (you know who you are). 

Do yourself a favor - get out there and check the plugs and connectors at both ends of your power cord today and at least every couple of months thereafter.