Home Inspection Electrical Practice Test

Is the statement true or false: The service size is determined by the amperage and the voltage ratings?

1. True

2. False

3. Depends on the region

4. Only true for residential buildings

The correct answer is: True

The statement is true because the service size of an electrical system is indeed determined by both the amperage and voltage ratings. Service size refers to the capacity of the electrical service to handle the load demands of a building, which is measured in amps. Each electrical service is rated based on its maximum capacity to deliver electricity safely to the dwelling or building. The voltage rating provides an understanding of the electrical potential delivered, while the amperage rating indicates how much current can flow through the system. For example, residential services commonly come in sizes such as 100, 150, or 200 amps and operate at 120/240 volts. In residential settings, the combination of these two ratings helps ensure that the electrical installation can accommodate both the consistent and peak loads of appliances and devices within the home. Understanding this relationship is crucial for proper electrical design and safety compliance.