Journeyman Electrician Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

When utilizing an overcurrent protective device in conjunction with a surge protective device, it is important to note that the surge protective device does not function as a service disconnect. The primary role of an overcurrent protective device, such as a circuit breaker, is to disconnect the electrical circuit in the event of excessive current, which protects the wiring and equipment from damage. However, the surge protective device is designed to divert or clamp excess voltage from surges, such as those caused by lightning strikes or other sudden electrical spikes, without necessarily disconnecting the supply.

This distinction highlights that while both devices serve critical safety roles, the surge protective device is primarily there to manage transient voltage events and does not disconnect power under normal operating conditions. Thus, it remains connected even when the overcurrent protective device is in operation, reinforcing that it is not considered a service disconnect. This understanding is essential for electricians to ensure proper applications and compliance with safety standards.