NEC Commercial Electrical Practice Test

In a dwelling unit requiring additional A/C equipment, a calculated load of the first 8 KVA requires a minimum service of how many amps?

1. 60 amps

2. 80 amps

3. 100 amps

4. 120 amps

The correct answer is: 100 amps

To determine the minimum service required for a dwelling unit with a calculated load, it's important to convert the KVA (Kilovolt-Amperes) load into amps. In this case, the first 8 KVA contributes to the total load calculation. When calculating the service amperage, the formula used is: Amperage (A) = KVA × 1000 / Voltage (V) In residential settings, the standard voltage for service is typically 120/240 volts. However, for this calculation, we'll use the more relevant figure, which approximates to 240 volts for the total service. So, for an 8 KVA load at 240 volts, the calculation would be: Amperage = 8 KVA × 1000 / 240 V = 33.33 amps However, in the National Electrical Code (NEC), there are certain requirements and demand factors that apply to dwelling units. For A/C equipment loads, there are allowances for calculating demand which generally lead to needing a higher service ampacity to accommodate additional loads, particularly as the total load increases. According to NEC standards for dwelling units, if the calculated load indicates a requirement beyond certain thresholds, rounding up to the nearest standard service