Which statement regarding OCPDs is correct?

The statement regarding the reliability of Overcurrent Protection Devices (OCPDs) and its effect on arc-flash hazards is correct because the effectiveness of OCPDs plays a crucial role in the overall safety of electrical systems. OCPDs, which include devices such as circuit breakers and fuses, are designed to interrupt electrical flow when excessive current is detected. If these devices fail to operate correctly, it can lead to prolonged arcing conditions during a fault, significantly increasing the risk and severity of arc-flash incidents.

Proper functioning of OCPDs helps to minimize the duration of an electrical fault, thus reducing the potential for injury to personnel and damage to equipment. As such, understanding the reliability and maintenance requirements of OCPDs is fundamental for ensuring a safe electrical environment in line with NFPA 70E standards. This highlights the importance of regular maintenance and testing to ensure that these devices operate as intended and provide effective protection against both overcurrent and arc-flash hazards.