WOULD LIKE TO KNOW HOW MANY DUPLEX RECPTACLES YOU CAN PUT ON A 20 AMP CIRCUIT IN A OFFICE BUILDING ALSO NEED CODE REFFERENCE. THANKS FOR YOUR HELP. EASYMAC
220.3(B)(9) just gives us a calculated load. We have to combine the calculated load with 210.11 to come up with the maximum number of receptacles permitted on the circuit. And, yes, we do need to know the circuit voltage. See 220.2
Also read this thread.
Don