The hierarchy of controls

 

The hierarchy of controls is a system used in occupational safety and health to minimize or eliminate exposure to hazards. It is arranged in a specific order to prioritize the most effective methods of control. The hierarchy is typically represented as a pyramid with five levels, from the most effective to the least effective. Here’s a breakdown of each level:

1. Elimination

Definition: Completely remove the hazard from the workplace.

Examples:

Redesigning a process to eliminate the use of a hazardous chemical.

Automating a manual handling process to remove the need for lifting heavy objects.

Effectiveness: This is the most effective method because it completely removes the hazard, eliminating any risk of exposure.

2. Substitution

Definition: Replace the hazardous material or process with a less hazardous one.

Examples:

Using a less toxic cleaning solvent.

Replacing a noisy machine with a quieter model.

Effectiveness: This is the second most effective method. While it reduces the hazard, it may introduce new risks that need to be managed.

3. Engineering Controls

Definition: Isolate people from the hazard through physical means.

Examples:

Installing guards on machinery.

Using local exhaust ventilation to remove airborne contaminants.

Implementing noise barriers or soundproof enclosures.

Effectiveness: These controls do not eliminate hazards but are designed to reduce exposure. They are more effective than administrative controls and PPE because they provide a physical barrier between the worker and the hazard.

4. Administrative Controls

Definition: Change the way people work by implementing policies, procedures, and training.

 Examples:

Rotating workers to limit exposure time to hazards.

Implementing safe work procedures and protocols.

Conducting regular safety training and drills.

Effectiveness: These controls rely on human behavior and compliance, making them less reliable than elimination, substitution, and engineering controls. They are often used in conjunction with other controls to enhance safety.

5. Personal Protective Equipment (PPE)

Definition: Provide workers with equipment to protect them from hazards.

Examples:

Gloves, safety goggles, and respirators.

Hard hats, hearing protection, and safety footwear.

Effectiveness: This is the least effective method because it does not eliminate the hazard and relies on the correct and consistent use by the worker. PPE is often used as a last resort or as a supplementary measure when other controls are not feasible or effective.

By following this hierarchy, workplaces can systematically reduce risks and protect workers more effectively. The goal is always to eliminate hazards when possible and then to control them through the most effective means available.