NEC Commercial Electrical Practice Test

A lighting and appliance branch-circuit panel-board primarily protects what percentage of devices?

1. 50 percent

2. 60 percent

3. 70 percent

4. More than 50 percent

The correct answer is: More than 50 percent

A lighting and appliance branch-circuit panel-board is designed to protect and distribute electrical power to various devices and lighting fixtures within a building. Typically, it is engineered to handle a significant portion of the electrical load associated with lighting and appliances, which tends to exceed 50 percent. This is primarily due to the need for adequate capacity to handle continuous and non-continuous loads, ensuring that users have reliable access to power without risking overloads. In practical terms, most installations will be designed to accommodate a higher percentage of lighting and appliance connections relative to total potential loads. This ensures that even during peak demand times, the system remains robust and can safely manage the power needs of the devices connected to the panel-board. As a result, stating that a lighting and appliance branch-circuit panel-board protects more than 50 percent of devices accurately reflects its capability to support the majority of expected loads in typical residential and commercial applications.