220 Dwelling service calculations - Part 3

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Question 1 of 4

1. Question

Which two tables are mentioned in the video as options for sizing service conductors according to the National Electrical Code?

Table 250.122 and Table 250.66
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Table 310.12 and Table 310.16
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Table 310.16 and Table 250.66
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Table 310.15(B)(1) and Table 310.15(B)(2)
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Question 2 of 4

2. Question

Why might an electrician choose the optional method of load calculation instead of the standard method when calculating service loads for a dwelling unit?

The optional method is required for all residential calculations under the NEC
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The optional method allows for the calculation of lower overall loads, which may reduce the required service size.
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The optional method always results in the same load as the standard method but is faster to calculate
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The optional method applies only to commercial buildings, not dwelling units
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Question 3 of 4

3. Question

Under the 2023 NEC, when performing an optional method calculation for a single-family dwelling, how are the loads exceeding 10 kVA handled for general lighting and small appliance branch circuits?

The entire load is calculated at 100% with no adjustments.
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The first 10 kVA of the load is calculated at 100%, and any load exceeding 10 kVA is calculated at 40%.
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All loads exceeding 10 kVA are calculated at 50% of their value.
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All loads are calculated at 40% regardless of their size.
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Question 4 of 4

4. Question

When sizing a grounding electrode conductor (GEC) for a service, according to the 2023 National Electrical Code (NEC), which of the following should be used as the basis for determining the conductor size?

The total connected load served by the service.
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The size of the ungrounded (hot) service-entrance conductors supplying the service.
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The rating of the overcurrent protection device (breaker) protecting the service.
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The length of the grounding electrode conductor run.
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220 Dwelling service calculations – Part 3

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220 Dwelling service calculations – Part 3

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