HOLT Electricians Practice Exam

After applying the demand factors in Article 550, what is the total park electrical wiring load for a small mobile home park with six mobile homes?

1. 18,720 VA

2. 24,000 VA

3. 27,840 VA

4. 30,000 VA

The correct answer is: 27,840 VA

To determine the total park electrical wiring load for a small mobile home park, it's important to understand how demand factors are applied according to Article 550 of the National Electrical Code (NEC). When calculating the electrical load for mobile homes, demand factors help to account for the fact that not all units will use their full capacity at the same time. In this scenario, the load is based on the number of mobile homes present and the individual demand calculations that the NEC recommends for such installations. Each mobile home typically has an average demand load of around 8,000 VA. However, when you consider multiple units, demand factors come into play to reduce the overall potential load, recognizing that not every home will be operating at full capacity simultaneously. For six mobile homes, if we start by calculating the total potential load without applying demand factors, it would be 6 homes multiplied by 8,000 VA each, resulting in 48,000 VA. However, using demand factors as specified in Article 550 effectively reduces this total load estimate. Common demand factors range around 40% to 60% depending on the specific guidelines applied, and for this case, the appropriate demand factor would lead to a final load of 27,840 VA. This total