Where shall "Danger High Voltage" signs be posted?

"Danger High Voltage" signs are crucial for ensuring safety in environments where high voltage electricity is present. These signs should be posted on all transformer enclosures and high potential switchboards to clearly indicate the risks associated with high voltage equipment. This strategic placement helps in preventing accidents by alerting employees and visitors to the potential dangers in these specific areas.

Posting the sign on transformer enclosures is essential because these are often not only surrounded by equipment but may also require maintenance or interaction by personnel. High potential switchboards, being critical components that handle significant electrical loads, also pose serious hazards if safety precautions are not adhered to. By marking these sites clearly with "Danger High Voltage" signs, it promotes awareness and proactive safety measures among all individuals who may be in or around these locations.

The other options do not address the primary concerns adequately. For instance, placing signs only at the entrance of the facility does not inform individuals who may be near the hazardous equipment. Similarly, limiting the signs to maintenance rooms or placing them on employee desks does not provide adequate warnings where immediate dangers exist. Therefore, the correct protocol requires these signs to be positioned where they can effectively warn of the dangers posed by high voltage areas to ensure maximum safety.