Under what circumstances are surge protective devices not required?

Surge protective devices (SPDs) are intended to protect electrical equipment from voltage spikes or surges, particularly those caused by lightning strikes or electrical malfunctions. The correct answer indicates that SPDs may not be necessary when some form of surge protection is already in place, as existing measures can sufficiently mitigate the risk of damage from surges. Additionally, if the threat of a surge is considered negligible, it may not warrant the installation of additional protection measures.

In practical scenarios, if an environment already features embedded surge protection mechanisms, such as specific circuit designs or structural features, it can effectively reduce the need for further SPDs. Similarly, in low-risk areas or situations where the likelihood of a significant surge occurrence is minimal, the cost and effort of installing SPDs may be deemed unnecessary. Recognizing these contexts is crucial for making informed decisions regarding surge protection strategies.