After a fault is interrupted near the interrupting rating, what is the correct maintenance action according to the cited standard?

• A. Inspected and Tested
• B. Repainted and Tagged
• C. Released for Service
• D. Warrantied and Replaced

Answer: (A)

When a fault is interrupted near the interrupting rating, the protective device has endured heavy current and energy, which can cause hidden damage to contacts, trip mechanisms, or insulation. The standard requires inspecting and testing the device before it’s returned to service to verify it will still operate correctly and trip reliably if another fault occurs. This involves checking for physical damage, wear, overheating, or misalignment, and performing functional tests to confirm correct timing and coordination with other devices. Cosmetic actions or simply tagging the device don’t address potential failures, and releasing it for service without verification could leave the system unprotected. Replacing or warranting the device is only necessary if actual damage is found; otherwise, thorough inspection and testing is the proper maintenance step.