Any electrician that has done any commercial, has gotten the call that the circuit keeps tripping. When it was installed you were told that it would just be a computer and maybe a calculator at each desk. When you get there to check it out all of the girls have a heater and the older gals have a fan, because the heaters make it to hot and one time I even found a fish tank on a desk. It is impossible to know what is going to be plugged into a receptacle once it is installed.