San Lei Ren Yuan (三类人员) cheat sheet
San Lei Ren Yuan (三类人员) · Keep the key ideas within reach.
Chinese safety qualifications, duties and actual legal scope
Distinguish the three-personnel assessment from registered safety engineer levels.
Allocate actual duties, authority, resources and evidence.
Contracts and consultants do not erase statutory obligations.
Use current legal and local scope rather than obsolete staffing tables.
Risk assessment, preventive barriers and corrective evidence
Define the actual scenario before scoring risk.
Choose the analytical tool for its assumptions and purpose.
Assess real barrier effectiveness and independence.
Verify corrective action instead of closing records on promises.
Occupational exposure, protective controls and health evidence
Assess route, form, duration and actual task exposure.
Distinguish average, short-term and ceiling criteria.
Match protective controls and equipment to the hazard.
Health surveillance complements rather than replaces prevention.
Machine, electrical and process hazard mechanisms
Identify every relevant energy source and task.
A stop button or guard closure does not establish isolation or safe restart.
Distinguish earthing, bonding, insulation and protective disconnection.
Assess process deviations and management of change.
Construction responsibilities, temporary works and changing sites
Reassess changing phases and contractor interfaces.
Temporary works depend on engineered conditions and sequence.
Preserve the actual scheme, change and acceptance trail.
Fall, lifting and electrical controls require their complete actual systems.
Emergency readiness, incident analysis and learning
Link plans and exercises to actual scenarios and capability.
Prevent unprotected secondary rescue casualties.
Report truthfully and distinguish evidence from inference.
Verify systemic corrective actions rather than stop at blame.
Combustion, heat transfer and explicit fire models
Distinguish flash point, ignition conditions, rate and total energy.
State units and limits of a t-squared or energy model.
Cooling smoke can remain dangerous through toxicity and visibility.
Actual geometry and ventilation matter to model validity.