What size circuit modifications does NOT require an Electrical Plan Review?

The correct choice indicates that circuit modifications not exceeding 5% of rated capacity do not require an Electrical Plan Review. In electrical work, there are guidelines in place that streamline the permitting process for certain minor modifications. Specifically, circuit modifications that remain within a small percentage of the existing capacity — in this case, 5% — are generally considered to be low-risk changes that fall within the normal operational parameters of the system. As such, they do not necessitate a comprehensive plan review, thereby facilitating quicker implementation and avoiding unnecessary bureaucratic delays.

In contrast, modifications related to circuits rated over 400 amps or those involving emergency systems typically involve significant safety considerations and greater complexity, mandating a more thorough review. Additionally, circuits operating under 200 volts might not automatically qualify for exemption based solely on voltage level, as other factors, including the circuit's capacity and the extent of modifications, also play a role in determining whether a plan review is required.