ISO 12100: Substantial Modification — When a Rebuilt Machine Needs a New Risk Assessment and CE Mark

Date
2027-01-04
Location
Online
Host
Zach L

About this event

A live 30-minute expert session on Substantial Modification — When a Rebuilt Machine Needs a New Risk Assessment and CE Mark (ISO 12100 — Machinery Risk Assessment). What We'll Cover: What substantial modification means under the Machinery Regulation and national guidance, and who becomes the 'manufacturer' after a rebuild Step-by-step decision method: new hazard or increased risk introduced, existing measures still adequate, modification assessed like a new design if not How the modification risk assessment maps to ISO 12100 and either updates or replaces the original technical file Common mistakes: control retrofits treated as like-for-like, no baseline assessment of the old machine, in-house rebuilds with no documentation at all The modification assessment record and decision memo that protects you when an authority or insurer asks who CE marked the rebuilt machine Related topics: substantial modification machinery · machine retrofit ce marking · rebuild risk assessment · modification decision criteria · manufacturer obligations rebuild · control system retrofit · used machinery compliance · machinery regulation modification · blue guide modification · in-house machine building · modification technical file · change impact assessment Critical Systems Analysis provides embedded functional safety consulting for ISO 12100 — Machinery Risk Assessment. Learn more: https://criticalsystemsanalysis.com Partner with us: https://meetings.hubspot.com/benjamin-twombly/strategic-partnerships

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About Functional Safety Foundations

This online session delivers expert-led instruction on the regulatory landscape and implementation approach for Functional Safety Foundations.

The cross-sector fundamentals underlying every functional safety standard: risk as severity × likelihood, the safety function concept, integrity levels, the safety lifecycle, and the split between random and systematic failures.

What it regulates

Shared vocabulary and reasoning: hazard → risk → risk reduction allocation → safety requirement → verified implementation → maintained integrity in operation.

Who must comply

Everyone entering the field — the conceptual base of the entire catalog.

Key requirements of Functional Safety Foundations

  • Hazard and risk fundamentals
  • Safety function anatomy: sensor-logic-actuator with defined safe state
  • Integrity ladders (SIL/PL/ASIL/DAL) as risk-reduction currencies
  • Random vs systematic failure treatment
  • Lifecycle and management of functional safety incl. competence

Key concepts: Functional Safety Foundations

Risk reduction allocation
Distributing required risk reduction among mechanical design, safeguards, control functions and procedures.
Functional safety management
Planning, competence, documentation and assessment wrapped around technical work.
Random vs systematic
Hardware wear-out/chance failures quantified statistically versus design/process errors controlled by rigor.
Safe state
The defined condition a function drives the equipment to on demand or fault.

Frequently asked questions: Functional Safety Foundations

Why can't testing alone prove safety?

Rare-event targets (like 1e-7/h) are unverifiable by test duration, and systematic errors evade random testing — hence the standards' dual machinery of quantified hardware analysis plus process rigor and independent assessment.

Standard information based on the published text of Functional Safety Foundations. Event content is provided by the host. For authoritative guidance, consult the official standard body.