Texas Masters Question

[dsawyer]

the question read....Calculate the demand for the fastened in place appliances.

Water Heater 1500VA
Garage door opener 960VA
Dishwasher 960VA(assume 50% motor load)
Garbage disposal 1240VA

Do you add the loads and then calculate the demand or do you need to take into consideration the motor loads of the disposal, garage door and dishwasher. Do you apply article 430 to the motor loads and then add the loads?

Question 2:
120V X 20 A = 2400VA 2400VA * 180VA ?= 13 receptacles per circuit. So why do a lot electricians think 7 receptacles is the maximum allowed on one circuit.

 

[bphgravity]

Re: Texas Masters Question

1. Don't worry about the motor considerations until later in the service calculation. All you are figuring for this question is the appliance load exclusively. Add the loads and apply the demand.

2. I don't know why you know electricians that think only 7 receptacles are permitted on one 20-ampere branch circuit. Perhaps this was a local requirement or maybe a company policy that got passed as an NEC requirement.

 

[infinity]

Re: Texas Masters Question

I'm assuming that question #2 is in other than a dwelling.

 

[dsawyer]

Re: Texas Masters Question

yes it is in a non-dwelling. I have heard several of my fellow electricians mention the 7 receptacle rule but I never asked them where they learned it. Maybe it is a city code, I will try looking in the city of Houston ordinences.