2,400 volt-amperes (20 x 120 = 2,400) can be carried by a 20-ampere, 120-volt branch circuit. A 20-amp branch circuit can support a maximum of three devices (2,400 x 750 = 3.2 = 3).
Each outlet for a heavy-duty lamp holder must be estimated at a minimum of 600 volt-amperes in line with Section 220.14(E). Multiply 600 volt-amperes by 125 percent because the load is continuous (600 x 125 percent Equals 750 volt-amperes). 2,400 volt-amperes (20 x 120 = 2,400) can be carried by a 20-ampere, 120-volt branch circuit. A 20-amp branch circuit can support a maximum of three devices (2,400 x 750 = 3.2 = 3). For 16 outlets with heavy-duty lamp holders, six 20-ampere branch circuits are needed.
An inaccurate result can be obtained by first determining the total volt-amperes of all the heavy-duty lamp holders and then dividing that number by the number of volt-amperes in each 20-ampere branch circuit. For instance, 16, multiplied by 600 volt-amperes, is 9,600 volt-amperes (16, multiplied by 600 = 9,600 volt-amperes). Due to the continuous nature of the load, multiply 9,600 volt-amperes by 125 percent (12,000 volt-amperes from 9,600 volt-amperes).
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