What should you do with lighting units before checking the condition of a lamp?

• A. Turn them on
• B. Remove the unit
• C. Always unplug lighting units
• D. Cover with cloth

Answer: (C)

Always unplug lighting units before checking the condition of a lamp. Disconnecting the unit from its power source removes all electrical current, which greatly reduces the risk of electric shock or creating a short while you inspect or handle the lamp. Relying on turning the light off isn’t enough— switches can fail or leave some power present in the circuit. If the unit is hardwired, also ensure the corresponding circuit breaker is off or the fuse is removed so nothing can energize the fixture. Keeping the unit unplugged makes the inspection safer and easier, and it avoids heat or fire risks from an energized or misbehaving lamp.