56 Industrial Accidents and Safety: Definition, Heinrich’s Domino, Bird’s Pyramid, Causes (Unsafe Acts / Conditions), Frequency and Severity Rates, Safety Programmes, Statutory Safety (Sections 21-41 Factories Act), Safety Committee, Safety Officer, Disaster Management and the OSH&WC Code 2020
56.1 Safety as a Line Function
An industrial accident is an unplanned event in the course of work that interrupts the orderly progress of activity and may cause injury, ill-health, damage or loss. Safety is now seen not as a “staff function” delivered by a safety department but as a line function of every supervisor and worker. The legal framework runs from Sections 21-41 of the Factories Act 1948 and the Mines Act 1952 through the Employees’ Compensation Act 1923 (compensation), the ESI Act 1948 (disablement benefit) to the modern OSH&WC Code 2020.
56.2 1 · Concept and Definitions
| Source | Substance |
|---|---|
| ILO | An accident is an unexpected and unplanned occurrence which interrupts an orderly progress of activity |
| Heinrich (1931) | An unplanned and uncontrolled event in which the action or reaction of an object, substance, person, or radiation results in personal injury or the probability thereof |
| Factories Act / Mines Act | Accident causing death, bodily injury or loss; reporting obligation under Section 88 of Factories Act |
Heinrich’s 1931 study of 75,000 industrial accidents proposed the 1:29:300 ratio — for every 1 major injury, there are 29 minor injuries and 300 no-injury near-misses. The triangle is foundational to modern safety thinking.
56.3 2 · Theories of Accident Causation
| Theory | Substance |
|---|---|
| Heinrich’s Domino (1931) | Five-domino sequence: social environment → fault of person → unsafe act/condition → accident → injury. Remove unsafe act → no accident |
| Bird and Loftus (1976) — Updated Domino | Five dominoes: lack of management control → basic causes → immediate causes → incident → loss |
| Bird’s Triangle (1969) | 1 serious : 10 minor : 30 property damage : 600 near-misses |
| Reason’s Swiss Cheese (1990) | Multiple defensive layers, each with holes — accident occurs when holes align |
| Multiple Causation | Most accidents have many contributing factors — no single cause |
| Human Factor / Psychological | Unsafe acts due to inattention, fatigue, attitude |
| Pure Chance | Random, statistical occurrence |
| Energy Release | Accident = unwanted release of energy (Haddon) |
56.4 3 · Causes of Accidents
| Category | Examples |
|---|---|
| Unsafe Acts (≈ 88 % per Heinrich) | Working without authority, failure to warn, working at improper speed, using defective equipment, removing safety devices, distraction, horseplay, lifting improperly |
| Unsafe Conditions (≈ 10 % per Heinrich) | Defective tools, inadequate guarding, poor housekeeping, defective design, hazardous arrangement, inadequate illumination, ventilation |
| Acts of God / Inherent (≈ 2 %) | Lightning, earthquake, etc. |
56.5 4 · Measurement of Industrial Accidents
| Index | Formula | Substance |
|---|---|---|
| Frequency Rate | (No. of disabling injuries × 1,000,000) ÷ Total man-hours worked | Frequency per million man-hours |
| Severity Rate | (No. of man-days lost × 1,000,000) ÷ Total man-hours worked | Days lost per million man-hours |
| Incidence Rate | (No. of injuries × 1,000) ÷ Average number of workers | Per 1,000 workers |
| Accident Cost | Direct (medical, compensation) + Indirect (downtime, recruitment, damage, reputation) | |
| Heinrich’s iceberg | Indirect costs ≈ 4 times direct costs |
56.6 5 · Safety Programme
A comprehensive safety programme typically includes:
- Safety policy signed by top management.
- Safety committee with worker and management representatives.
- Safety officer (statutory).
- Workplace inspection and hazard reporting.
- Job safety analysis (JSA).
- Permit-to-work system.
- Training — induction, on-the-job, refresher.
- PPE programme.
- Emergency preparedness — fire, evacuation, mutual aid.
- Accident investigation and follow-up.
- Safety promotion — posters, awards, campaigns.
- Management review.
56.7 6 · Statutory Safety — Factories Act 1948 (Sections 21-41)
| Section | Provision |
|---|---|
| 21 | Fencing of machinery |
| 22 | Work on or near machinery in motion |
| 23 | Prohibition of employment of young persons on dangerous machines |
| 24 | Striking gear and devices for cutting off power |
| 25 | Self-acting machines |
| 26 | Casing of new machinery |
| 27 | Prohibition of women / children near cotton openers |
| 28 | Hoists and lifts |
| 29 | Lifting machines, chains, ropes |
| 30 | Revolving machinery |
| 31 | Pressure plant |
| 32 | Floors, stairs and means of access |
| 33 | Pits, sumps, openings in floors |
| 34 | Excessive weights |
| 35 | Protection of eyes |
| 36 | Precautions against dangerous fumes, gases |
| 36A | Precautions in respect of portable electric light |
| 37 | Explosive or inflammable dust, gas |
| 38 | Precautions in case of fire |
| 39 | Power to require specifications of defective parts |
| 40-40A | Safety of buildings and machinery |
| 40B | Safety Officer — required where 1,000+ workers |
| 41 | Power to make rules |
Section 40B requires a Safety Officer in factories employing 1,000 or more workers (or as may be notified for hazardous processes irrespective of number).
56.8 7 · Chapter IV-A — Hazardous Processes (Sections 41A-41H)
Added by 1987 amendment post-Bhopal disaster (1984) — special provisions for hazardous processes:
- 41A — Site Appraisal Committee.
- 41B — Compulsory disclosure of information by occupier.
- 41C — Specific responsibility of occupier in relation to hazardous processes.
- 41D — Central government power to appoint Inquiry Committee.
- 41E — Emergency standards.
- 41F — Permissible limits of exposure of chemical and toxic substances.
- 41G — Worker’s participation in safety management; Safety Committee.
- 41H — Right of workers to warn about imminent danger.
56.9 8 · Safety Committee — Section 41G
A Safety Committee with equal representation of workers and management is mandatory for factories with hazardous processes. It reviews safety performance and recommends improvements.
56.10 9 · Disaster Management
After Bhopal (1984), India developed a multi-tier framework:
- Manufacture, Storage and Import of Hazardous Chemicals Rules 1989 (under Environment Protection Act 1986).
- Public Liability Insurance Act 1991 — no-fault liability for hazardous-industry accidents.
- National Environment Tribunal Act 1995.
- Disaster Management Act 2005 — set up NDMA, SDMA, DDMA.
- National Disaster Management Plan 2019.
56.11 10 · Position under the OSH&WC Code 2020
The Code consolidates safety provisions of the Factories Act, Mines Act, Plantations Act, Building & Other Construction Workers Act, Contract Labour Act and ISMW Act. Key features:
- National OSH Advisory Board.
- Safety committees required by notification.
- Free annual health check for workers above 45.
- Appointment letters mandatory.
- Enhanced penalties for fatal accidents.
56.12 11 · Indian Safety Performance — Selected Numbers
- ESI Corporation processes ≈ 30,000-40,000 disablement claims annually.
- DGMS reports ≈ 100-150 fatalities per year in mines.
- DGFASLI reports thousands of factory accidents (non-fatal majority).
- Construction sector — high under-reporting; ILO estimates 38 fatal per 100,000 workers globally.
56.13 12 · Indian Standards and Codes
- IS 14489 — Code of Practice on Occupational Safety and Health Audit.
- IS 18001 / OHSAS 18001 → ISO 45001 (2018) — Occupational Health and Safety Management Systems — global voluntary standard.
56.14 Practice Questions
Heinrich's accident ratio 1:29:300 refers to:
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Heinrich's Domino Theory has how many dominoes?
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A Safety Officer is required under Section 40B of the Factories Act for factories employing:
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A Safety Committee under Section 41G has:
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Frequency Rate of injuries =
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Chapter IV-A on hazardous processes was added to the Factories Act after the:
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The "Swiss Cheese" model of accidents is associated with:
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Per Heinrich, unsafe acts account for approximately:
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Per Heinrich's iceberg, indirect accident costs are approximately:
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Fencing of machinery is covered under:
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Workers' right to warn about imminent danger is in:
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The Public Liability Insurance Act provides:
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ISO 45001 is a global standard on:
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The "energy release" model of accidents is associated with:
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Arrange Heinrich's dominoes in correct order:
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Severity Rate measures:
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Bird's revised triangle (1969) ratio is approximately:
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Site Appraisal Committee under Section 41A reviews:
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The Disaster Management Act came in:
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Safety provisions of the Factories Act 1948 are now consolidated in:
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56.15 Quick Recall
- Heinrich (1931): 1:29:300 pyramid; 88 % unsafe acts / 10 % unsafe conditions / 2 % unavoidable; indirect costs 4 × direct.
- Theories: Domino (Heinrich), Updated Domino (Bird-Loftus 1976), Bird’s Triangle (1:10:30:600), Swiss Cheese (Reason 1990), Energy Release (Haddon), Multiple Causation.
- Indices: Frequency Rate (× 10⁶ ÷ man-hours); Severity Rate (days lost × 10⁶ ÷ man-hours); Incidence Rate (× 1,000 ÷ workers).
- Factories Act Safety: Sections 21-41 + Chapter IV-A (Sections 41A-41H — post-Bhopal 1987 amendment).
- Safety Officer — Section 40B — 1,000+ workers.
- Safety Committee — Section 41G — equal worker-management representation.
- 41H — Workers’ right to warn of imminent danger.
- Bhopal-driven reforms: Hazardous Chemicals Rules 1989; Public Liability Insurance Act 1991; National Environment Tribunal Act 1995; Disaster Management Act 2005.
- OSH&WC Code 2020 consolidates safety regime; annual free check-up for 45+.
- Global standard: ISO 45001 (2018) — OHS management systems.