One of my students pointed out an inconsistency in the load calc examples in Annex D, between a load calc for a single family dwelling [D1(a)] and a commercial space [D3].

In the former, to calculate the number of branch circuits for the general lighting load, 4500 VA is divided by the voltage of only one phase: 120 volts, while in the latter example, the general lighting load is divided by the voltage of both phases: 240 volts. In the latter example, 210.11 (B) is cited, whereby the load is to be evenly apportioned on the load center.

Since I do not believe 210.11 (B) only applies to commercial spaces, I am unable to explain the discrepancy to my student. Any clarification would be greatly appreciated.

In the former, to calculate the number of branch circuits for the general lighting load, 4500 VA is divided by the voltage of only one phase: 120 volts, while in the latter example, the general lighting load is divided by the voltage of both phases: 240 volts. In the latter example, 210.11 (B) is cited, whereby the load is to be evenly apportioned on the load center.

Since I do not believe 210.11 (B) only applies to commercial spaces, I am unable to explain the discrepancy to my student. Any clarification would be greatly appreciated.

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