Alternatively, you can use the demand factors for receptacles given in Table 220.44, which are as follows:
According to 220.44, you can add these calculated loads to the lighting loads and apply the lighting load demand factors given in Table 220.42. Receptacle feeder/service calculated loadĬalculate receptacle loads at not less than 180VA per outlet (strap) per 220.14(I) and fixed multioutlet assemblies per 220.14(H). For the purposes of this calculation, a single receptacle or a duplex receptacle each count as 180VA. 100 definition, a duplex receptacle is two receptacles on the same yoke. Calculate the number of receptacles per circuit by dividing the VA rating of the circuit by 180VA for each receptacle strap (also called a yoke), as shown in Fig. The maximum number of receptacle outlets permitted on a commercial or industrial circuit depends on the circuit ampacity. The load for a general-use receptacle outlet in a non-dwelling occupancy is 180VA per strap. Receptacles are generally not considered continuous loads. At 13 sections per circuit, a 20A branch circuit can serve two tables. Then, divide by 180VA to find how many 180VA sections a 20A circuit can serve:Įach work bench requires 2 – 180VA sections for the 10 ft section, and 3 – 180VA sections for the 3 ft section, which is 5 – 180VA sections per workbench.
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This next example shows how to size the branch circuits using 20A branch circuits.ġ20V x 20A = 2,400VA for noncontinuous loads 1), each of which has 10 ft of multioutlet receptacle assembly (not used simultaneously) and 3 ft of multioutlet receptacle assembly (used simultaneously)?ġ0 stations with 10 ft per station = 100 ft of multioutlet assembly (not simultaneously used)ġ0 stations with 3 ft per station = 30 ft of multioutlet assembly (simultaneously used)ġ00 ft ÷ 5 ft per section = 20 sections x 180VA = 3,600VAģ0 ft ÷ 1 ft per section = 30 sections x 180VA = 5,400VAĬalculated load = 3,600VA + 5,400VA = 9,000VA What's the calculated load for 10 workstations ( Fig. Try this sample problem to determine the feeder/service load. A multioutlet receptacle assembly isn't generally considered a continuous load. If you expect several appliances to operate simultaneously from the same multioutlet receptacle assembly, consider each foot (or fraction of a foot) as 180VA for feeder/service calculations. This is assuming that it's unlikely for the appliances plugged into this assembly to operate simultaneously. For each 5 ft (or fraction thereof) of multioutlet receptacle assembly, use 180VA in your feeder/service calculations. The multioutlet receptacle assembly, such as a plug strip, is common in commercial applications. In part two of this installment, it’s time to address how to calculate receptacle loads and introduce the optional calculation method for commercial occupancies. Because different sets of demand factors apply for different types of electrical loads (and even for different types of commercial buildings), this article demonstrated why it’s important to determine what kinds of loads you have before starting your commercial load calculations.
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Last month in Code Basics, “Commercial Loads - Part 1,” on page 24 of the January issue, we discussed when it’s okay to apply demand factors when calculating electrical load requirements for commercial installations.
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