What must be posted at major electrical installations

• A. Warning signs.
• B. Operation schedules.
• C. Fire exit signs.
• D. Noise level notices.

Answer: (A)

The key idea is that areas with major electrical equipment require clear warning signs to communicate the presence of electrical hazards. These signs alert workers to the risk of electric shock, arc flash, or other harm and help ensure people keep a safe distance, use proper PPE, and follow safe practices like locking out equipment when needed. Warning signs are specifically about hazard communication at electrical installations, which is why they’re needed there.

Other items like operation schedules, fire exit signs, or noise level notices serve different safety needs—planning and procedure visibility, safe egress, or hearing protection requirements—rather than directly warning about electrical dangers. That’s why warning signs are the best fit for what must be posted at major electrical installations.