Where dwelling unit service equipment is replaced, a surge protective device, (SPO) , shall be instal led.
(a) True
(b) False
The Correct Answer and Explanation is :
The correct answer is:
(a) True
Explanation:
In modern electrical installations, surge protection devices (SPDs) are increasingly being required as part of dwelling unit service equipment replacement or installation. The National Electrical Code (NEC) and other relevant standards recognize the importance of protecting electrical systems and appliances from transient overvoltages, such as surges caused by lightning strikes or power grid switching. These surges can potentially damage sensitive electrical equipment, electronics, and appliances within a dwelling.
When service equipment is replaced or upgraded, it is generally required to include surge protection to minimize the risk of damage from these transient voltage spikes. Surge protective devices (SPDs) are designed to detect and divert excess voltage to the ground, protecting the internal wiring and devices from surges.
Specifically, NEC 2020, section 230.67 mandates that surge protection must be installed on the service entrance for new residential structures or when the service equipment is replaced. This requirement applies to both new constructions and existing homes undergoing significant electrical system upgrades or replacements.
SPDs are available in different forms, including whole-house surge protectors that are installed at the service panel. These devices do not prevent surges but help to control their impact by diverting the excess voltage away from sensitive components. This form of protection is important because electronic devices, appliances, and lighting circuits are becoming more sensitive to voltage fluctuations.
The installation of SPDs is a proactive step in ensuring the longevity and safety of electrical systems and devices. They are especially useful in areas prone to lightning or in regions where power quality issues are frequent. While surge protection is not always required for individual devices, protecting the entire electrical service panel is a critical strategy in modern residential electrical safety.