The amount of outlets that need to be installed in each room has drastically changed over the last 50 years. In the past one lone outlet would have sufficed however as the demand for more appliances grew so did the need for more outlets. In today’s standard kitchen a minimum of seven circuits is expected with often more. Across the home, outlets are placed about 18 inches above floor level.
Switches generally 48 inches from floor level. Receptacle outlets will be placed so that, at no given time, there are more than six feet of wall space between them. This is to prevent the use of extension cords. The branch circuit is usually figured for 1.5 amps, duplex outlets are 3 amps in total. Hallways over 10 feet require one general outlet with a three-way switch which allows the light to be switched on and off from both sides.