Software-based disconnects are acceptable substitutes for physical disconnect switches.

• A. True
• B. False
• C. Only for small rooms
• D. Only with AHJ approval

Answer: (B)

A physical disconnect switch is required to reliably isolate the system; software-based disconnects cannot provide the same level of safety and verification. A hard, manually operable disconnect that is visible, accessible, and lockable ensures immediate, verifiable de-energization for maintenance and reduces the risk of accidental or unauthorized discharge. Software or remote disconnections depend on power, software integrity, and communications, which can fail or be compromised, so they do not meet the standard’s requirement for a dependable physical isolation method. AHJ approval cannot substitute the need for a physical disconnect, so the statement is not acceptable.