Colorado Journeyman Practice Exam

To determine the required ampacity of the service conductors for the mobile home park with 26 mobile homes and a computed load of 22,000 volt-amperes, we need to calculate the amperage based on the total load.

First, we apply the formula for calculating amperage (I) from volt-amperes (VA) using the following relationship:

\[ I = \frac{VA}{V} \]

In a typical residential or commercial setting, the standard voltage supply is usually 120/240 volts for single-phase systems or 277/480 volts for three-phase systems. However, mobile home parks usually operate on a 240-volt single-phase service for efficiency.

Using this voltage:

\[ I = \frac{22,000 VA}{240 V} \]

Carrying out the division gives:

\[ I = 91.67 \text{ amperes} \]

This is the current load for the entire park. However, to size the service conductors, we must consider demand factors and the code requirements outlined in the National Electrical Code (NEC). The NEC often specifies that you should use demand factors for dwellings. In this case, mobile home parks might apply specific demand factors due to diversity in usage