Which type of equipment requires interlocks for safety?

• A. Low voltage radios
• B. Mechanical devices operating under high voltage
• C. Only outdoor equipment
• D. Digital signal processors

Answer: (B)

Interlocks are safety mechanisms designed to prevent the operation of equipment under unsafe conditions, particularly when high voltages and mechanical components can pose significant hazards. Mechanical devices operating under high voltage can cause severe injuries or fatalities if proper safety measures are not in place. Interlocks ensure that a device cannot be activated unless certain safety conditions are met, such as doors being closed or protective covers being in place. This is critical in high-voltage environments where accidental contact can lead to electrical shock or thermal burns.

In contrast, low voltage radios typically do not require interlocks since the risks associated with lower voltages are significantly less dangerous. Outdoor equipment is not inherently in need of interlocks simply due to its outdoor nature; rather, safety measures depend on the electrical specifications and types of machinery involved. Digital signal processors, being electronic devices operating within specific voltage limits and levels, also do not generally require interlocks for safety. Thus, the presence of interlocks is particularly crucial for mechanical devices operating under high voltage to protect users and ensure safe operation.