BS EN ISO 12100:2010 – Safety of machinery: General principles for design – Risk assessment and risk reduction is a key European standard that provides a structured approach to ensuring the safety of machinery throughout its lifecycle.

It is harmonised under the Machinery Directive 2006/42/EC, making compliance with it important for achieving CE marking in the European Economic Area (EEA).

Scope and Purpose

The primary objective of BS EN ISO 12100:2010 is to help designers and manufacturers of machinery identify hazards, assess risks, and implement appropriate measures to reduce those risks.

It applies to all machinery, irrespective of the complexity or type, from simple manual tools to complex automated systems.

Structure of the Standard

BS EN ISO 12100:2010 is structured into several key sections, focusing on different aspects of risk assessment and reduction:

1. General Principles
   • Establishes the fundamental safety objectives.
   • Stresses the importance of an iterative process that integrates safety considerations from the design phase through to disposal.
2. Risk Assessment Process The risk assessment process involves several steps:
   • Hazard identification: Identifying potential sources of harm related to the machinery’s lifecycle, including installation, operation, maintenance, and decommissioning.
   • Risk estimation: Assessing the severity of potential harm and the likelihood of occurrence.
   • Risk evaluation: Determining whether the risk is acceptable or requires further mitigation.
3. Risk Reduction Measures The standard follows a three-step hierarchy for risk reduction:
   • Inherently safe design measures: Eliminating hazards through design choices (e.g., using safer materials or modifying machine geometry).
   • Safeguarding and complementary protective measures: Implementing physical barriers, interlocks, and other protective devices.
   • Information for use: Providing clear instructions, warnings, and training to operators and maintenance personnel.
4. Documentation and Verification
   • Requires thorough documentation of the risk assessment and mitigation strategies.
   • Verification and validation processes to ensure that the implemented measures are effective.

Key Concepts and Terminology

• Hazard: A potential source of harm.
• Risk: A combination of the probability of an occurrence and the severity of potential harm.
• Residual risk: The risk remaining after protective measures have been applied.

Compliance and Legal Implications

Compliance with BS EN ISO 12100:2010 is not mandatory in itself but is crucial for meeting the legal requirements of the Machinery Directive. It is often referenced in legal disputes and insurance claims to demonstrate due diligence and adherence to best practices.

Practical Applications

• Design engineers use the standard during the conceptual and detailed design phases.
• Risk assessors apply the standard when evaluating existing machinery for retrofitting or modification.
• Auditors and regulatory bodies use it to assess compliance with health and safety legislation.

Conclusion

BS EN ISO 12100:2010 is a cornerstone of machinery safety in Europe and the UK. By providing a clear framework for risk assessment and reduction, it helps manufacturers design safer machines, protect workers, and comply with legal obligations.