What are the three types of energy that must be considered in safety protocols?

When considering safety protocols in construction and other industrial settings, it's essential to address various energy sources that can pose hazards. The correct answer includes electrical, mechanical, and pneumatic energy.

Electrical energy is significant due to the potential for electric shock, burns, or fires. Safety measures must be implemented to prevent these hazards, such as lockout/tagout procedures to ensure that electrical systems are de-energized during maintenance.

Mechanical energy refers to the energy that can cause physical injuries through machinery and tools. Proper safety guards, training, and maintenance procedures are critical to managing risks associated with moving parts or tools.

Pneumatic energy relates to systems that utilize compressed air. Hazards here could include unexpected release of pressurized air, which can lead to injuries or equipment damage. Safety protocols should involve proper storage and handling procedures to minimize these risks, as well as training workers to recognize and mitigate pneumatic hazards.

The other listed options contain combinations of energy types that may not collectively encompass all critical safety concerns in typical construction scenarios. Therefore, focusing on electrical, mechanical, and pneumatic energy addresses a broad spectrum of hazards that require careful consideration in safety planning and training.