Hierarchy of Control: Types, Levels and Workplace Examples

 

Hierarchy of Control: Types, Levels and Workplace Examples

Introduction

The Hierarchy of Control is one of the most effective methods used to manage workplace hazards. It helps organizations reduce risks by selecting the most effective control measures rather than relying only on personal protective equipment (PPE).

What is Hierarchy of Control?

The Hierarchy of Control is a structured approach used to eliminate or reduce workplace hazards. The controls are arranged from the most effective to the least effective.

The higher the control level, the greater the protection provided to workers.

Levels of Hierarchy of Control

1. Elimination

Elimination means completely removing the hazard from the workplace.

Example:

  • Removing a damaged machine from service.
  • Designing work so that employees do not need to work at height.

This is the most effective control measure because the hazard no longer exists.

2. Substitution

Substitution means replacing a hazardous process, substance, or equipment with a safer alternative.

Example:

  • Replacing a toxic chemical with a less hazardous chemical.
  • Using water-based paint instead of solvent-based paint.

3. Engineering Controls

Engineering controls isolate people from hazards through physical changes to equipment or the workplace.

Example:

  • Machine guards.
  • Local exhaust ventilation.
  • Noise barriers.
  • Safety interlocks.

These controls reduce exposure without depending on worker behaviour.

4. Administrative Controls

Administrative controls involve procedures, training, supervision, and work practices designed to reduce exposure to hazards.

Example:

  • Safe work procedures.
  • Permit to Work systems.
  • Safety training.
  • Warning signs and instructions.

These controls require workers to follow rules consistently.

5. Personal Protective Equipment (PPE)

PPE is the last line of defence and should not be the only control measure where higher-level controls are reasonably practicable.

Example:

  • Safety helmets.
  • Safety shoes.
  • Gloves.
  • Respirators.
  • Safety goggles.

PPE protects workers but does not remove the hazard itself.

Why is the Hierarchy of Control Important?

The Hierarchy of Control helps organizations:

  • Reduce workplace accidents.
  • Improve worker protection.
  • Meet legal requirements.
  • Improve safety performance.
  • Select the most effective control measures.

Practical Example

A worker is exposed to welding fumes.

Possible controls include:

  • Elimination: Use a process that does not require welding.
  • Substitution: Use a less hazardous welding method.
  • Engineering Control: Install local exhaust ventilation.
  • Administrative Control: Provide training and safe work procedures.
  • PPE: Use a suitable respiratory protective device.

Conclusion

The Hierarchy of Control is a fundamental safety principle used in risk management. Organizations should always consider elimination, substitution, and engineering controls before relying on administrative controls or PPE. Using higher-level controls provides better and more reliable protection for workers.

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