APPLYING DEMAND FACTORS NEC 220.14(I) AND TABLE 220.44
Автор: James G Stallcup
Загружено: 2020-09-21
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General-purpose receptacle outlets for cord-and-plug connected loads used at noncontinuous operation are calculated per 220.14(I) and Table 220.44. Noncontinuous operated receptacles with a VA rating of 10,000 VA or less shall be calculated at 100 percent. If the VA rating of the receptacle load exceeds 10,000 VA, a demand factor of 50 percent shall be permitted to be applied to all VA exceeding 10,000 VA per Table 220.44.
For example: What is the VA rating for 125 general-purpose receptacle outlets to cord-and-plug connect loads used at noncontinuous operation?
Step 1:
Calculating load
220.14(I) and 230.42(A)(1)
125 x 180 VA = 22,500 VA
Step 2:
Applying demand factors
Table 220.44
First 10,000 VA x 100% = 10,000 VA
Next 12,500 VA x 50% = 6,250 VA
Total load = 16,250 VA
Solution:
The demand load is 16,250 VA.
See Figure 2-10(a) for a detailed illustration for calculating the (noncontinuous) receptacle demand load.
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