What measures indicate that an area containing high‑voltage components is restricted?

• A. Barriers and warning signage.
• B. A casual door label on a cabinet.
• C. No restriction; anyone may enter.
• D. A sticker showing battery model.

Answer: (A)

When a space has high-voltage components, the clearest signal that entry is restricted is the presence of physical barriers paired with warning signage. Barriers create a tangible boundary that prevents unauthorized or accidental access, while warning signs convey the danger and outline the precautions needed. This combination reliably communicates that the area is off-limits to untrained individuals and helps enforce safe work practices.

A casual door label on a cabinet doesn’t offer the same protection or visibility and can be overlooked. Saying there’s no restriction is unsafe because it invites untrained people into a hazardous space. A sticker showing a battery model gives equipment information but doesn’t indicate access rules or safety requirements.