What is a key focus of Article 110.21 regarding modifications?

A key focus of Article 110.21 is indeed that modifications must not violate safety or performance requirements. This article emphasizes that any changes made to electrical installations should uphold safety standards, ensuring that the system remains compliant with the National Electrical Code and reliable in its operations. Maintaining safety and performance is paramount, as any modifications that compromise these aspects could lead to hazardous situations, such as electrical fires or equipment failures.

In contrast, while improving aesthetic appeal, reducing installation time, or limiting modifications to older equipment may have practical benefits or considerations in some contexts, they do not align with the primary intent of Article 110.21. The article explicitly prioritizes safety and performance over these other factors, reinforcing the fundamental principle that the integrity and safety of electrical installations must always come first.