For an existing electrical system, is it permissible to apply safety-related design concepts to reduce hazards?

• A. True
• B. False
• C. Only with a major upgrade
• D. Only if approved by the manufacturer

Answer: (B)

The idea being tested is whether safety-related design concepts can be retrofitted to an already existing installation. These design concepts are intended to guide the initial design and construction of a system to minimize hazards. Applying them to an installed system would effectively mean redesigning the safety features after the fact, which isn’t something you do as a routine change. To legitimately implement such design changes, you’d need a major upgrade or a formal redesign with engineering evaluation and, typically, manufacturer approval. Until that happens, hazard reduction in an existing system is addressed through other controls (safe work practices, PPE, barriers, insulation, and procedures) rather than retroactive design changes.