Informational Note No. 2 located after Table 130.5(C) provides the rationale that improper or inadequate maintenance may result in the protecting-OCPD taking longer to clear the fault current than its published clearing time.

Informational Note No. 2 located after Table 130.5(C) provides the rationale that improper or inadequate maintenance may result in the protecting-OCPD taking longer to clear the fault current than its published clearing time.

• A. True
• B. False
• C. Not mentioned
• D. Sometimes

Answer: (A)

The idea being tested is that the real performance of protective devices depends on their condition and maintenance. The informational note after Table 130.5(C) explicitly says that improper or inadequate maintenance may cause the protecting-OCPD to take longer to clear fault current than its published clearing time. The published time assumes the device is properly maintained and functioning under the specified conditions. If the device has wear, contamination, corrosion, a sticking mechanism, or a drifted or misadjusted trip unit, it can respond more slowly or fail to trip as intended. That can lead to fault currents persisting longer than the published time, increasing risk. So this statement is true because the note directly communicates that maintenance quality can extend clearing time.

The idea being tested is that the real performance of protective devices depends on their condition and maintenance. The informational note after Table 130.5(C) explicitly says that improper or inadequate maintenance may cause the protecting-OCPD to take longer to clear fault current than its published clearing time. The published time assumes the device is properly maintained and functioning under the specified conditions. If the device has wear, contamination, corrosion, a sticking mechanism, or a drifted or misadjusted trip unit, it can respond more slowly or fail to trip as intended. That can lead to fault currents persisting longer than the published time, increasing risk. So this statement is true because the note directly communicates that maintenance quality can extend clearing time.