True or False: When working on a 4 KV system extra caution is required due to its age, type of construction, and protection system.

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

Answer: (A)

Extra caution is needed on a 4 kV circuit because voltage level, aging, construction type, and the protection system all influence safety. As equipment ages, insulation can degrade, insulators can crack, moisture or dust can compromise insulating performance, and overall reliability can decline. Older construction may use materials or layouts that don’t meet current clearance and insulation standards, making the working environment more hazardous than newer gear. The protection system— breakers, relays, fuses, and other devices—must reliably detect faults and clear them quickly. If that protection is aged or not well maintained, a fault could linger or energize portions of the system longer than intended, increasing arc flash and shock risk for personnel. Because these factors collectively raise the potential for injury, extra caution on a 4 kV system is warranted. Saying it isn’t necessary, or that caution should be only sometimes required, wouldn’t align with safe practices for higher-voltage, aging assets.