With the number of home computers and home offices growing rapidly, the demand for electrical service has increased. In older homes, especially, a wiring upgrade may be required. Though computers and fax machines plug into a standard 120-volt outlet, too many of these devices could overload your electrical system. In addition, power surges and outages can cause data loss, so it's a good idea to use a surge protector on your computer. If power goes out frequently, you may also want to get a u-p-s, or uninterrupted power supply. A u-p-s can keep your computer running long enough to save what you're working on, and exit properly. Telephone systems, too, have become more complex. If you work at home, you may want a separate line for your fax machine, so you can talk and fax at the same time. Many telephone wiring jobs are simple enough to do yourself. However, you'll need to clear it with your local phone company, before starting any work. For more information on wiring for computers and telephones, consult a qualified electrician.