Dwelling Service Calculations - Optional Method

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Question 1 of 3

1. Question

According to the 2023 National Electrical Code (NEC) Article 220.53, when calculating the load for four or more fastened-in-place appliances in a dwelling unit, which of the following statements is correct?

Apply a 75% demand factor to any number of fastened-in-place appliances, regardless of type.
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Apply a 75% demand factor only if each appliance is rated less than 500 watts.
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Apply a 75% demand factor to four or more fastened-in-place appliances, excluding electric ranges, clothes dryers, space heating equipment, air-conditioning equipment, and electric vehicle supply equipment (EVSE).
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Apply a 75% demand factor to all appliances, including electric ranges and clothes dryers.
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Question 2 of 3

2. Question

Using the standard method of load calculations and Table 220.45 for lighting load demand factors in the 2023 NEC, how would you calculate the demand load for a dwelling unit with a total calculated lighting load of 15,000 volt-amperes?

15,000 VA at 35%
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The first 3,000 VA at 100%, the next 12,000 VA at 35%, and the remainder at 25%
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The first 3,000 VA at 100%, and the remainder at 35%
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15,000 VA at 100%
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Question 3 of 3

3. Question

Using the standard method of load calculations and Table 220.54 of the 2023 NEC, what demand factor would be applied to a load calculation for 6 household electric clothes dryers?

65%
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75%
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85%
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100%
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Dwelling Service Calculations – Optional Method

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Dwelling Service Calculations – Optional Method

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