There are several systems that operate together to make your homework. The major household systems are heating (with or without central air conditioning), plumbing and the electrical service. Each system has its own possible problems and dangers when you use it or work on it, so be aware of the safety. But, I believe that the electrical system has the potential of being the most dangerous, especially in older homes with services that have not been upgraded in recent years. Finding the Limits of Your Electrical Services The first thing...