Safety Practices and First Aid
Overview
Safety Practices and First Aid is a foundational chapter in ITI Electrician Semester 1 (NCVT). It covers workplace hazards, personal protective equipment (PPE), fire safety, electrical safety rules, and first aid procedures for electric shock, burns, and wounds. Understanding these concepts is essential not only for the exam but also for safe working in electrical trade environments. Questions from this chapter appear regularly in NCVT theory papers.
Typed Notes
Electrical Hazards and Safety Rules
Electrical hazards include electric shock, arc flash, fire, and explosions. The main causes are faulty insulation, overloading, short circuits, and improper earthing. Key safety rules: (1) Always isolate supply before working on any circuit. (2) Use a voltage tester to confirm the line is dead. (3) Never work alone on live equipment. (4) Use double insulated tools. (5) Display 'MEN AT WORK' boards near switchboards. (6) Ensure proper earthing of all metallic bodies of equipment. These rules prevent accidents and are frequently tested in NCVT papers.
Personal Protective Equipment (PPE)
PPE is equipment worn to minimize exposure to hazards. For ITI Electricians, mandatory PPE includes: Rubber insulating gloves (tested up to 1000 V for LT work), safety goggles (protect eyes from arc flash and sparks), safety shoes with rubber soles (prevent current path through body to ground), hard helmet (protects from falling objects), and insulated hand tools. PPE must be inspected before each use for cracks or damage. Damaged PPE must be replaced immediately. NCVT exams often ask which PPE is used for specific electrical tasks.
Fire Safety and Types of Fire Extinguishers
Fires are classified into four classes: Class A — ordinary combustibles (wood, paper, cloth) — use water or foam extinguisher. Class B — flammable liquids (oil, petrol) — use foam or DCP (Dry Chemical Powder). Class C — electrical/energized equipment — use CO₂ (Carbon Dioxide) or DCP extinguisher; NEVER use water on Class C fires as it conducts electricity. Class D — metal fires — use dry sand. Remember: CO₂ extinguisher is the SAFEST for electrical fires. Fire triangle consists of Fuel, Heat, and Oxygen — removing any one element extinguishes fire.
First Aid for Common Electrical Injuries
First Aid is the immediate care given before medical help arrives. For electric shock: (1) Switch OFF the power supply immediately. (2) Use a dry wooden stick or rubber gloves to separate victim from source — never use bare hands. (3) Call for medical help (dial 112). (4) If victim is unconscious and not breathing, start CPR — 30 chest compressions followed by 2 rescue breaths. For burns: Cool the burn under running cold water for 10–15 minutes; do not apply oil or toothpaste. For wounds: Apply pressure to stop bleeding, then bandage. Artificial respiration rate: 12–16 breaths per minute.
Topics & Sub-topics
Har topic ke saath sub-topics aur example — chapter ka complete coverage.
01Electrical Hazards
- Electric shock — even 30 mA through the chest can be fatal
- Arc flash and burns near switchgear
- Electrical fire (Class C)
Isliye modern ghar mein RCCB 30 mA sensitivity ka lagta hai — leakage hone par turant trip.
02Safety Rules and PPE
- Supply off + LOTO before work
- Insulated gloves, rubber mat, safety shoes
- Helmet and goggles near panels
Panel kaam se pehle main switch off + lock + 'Do not operate' tag — yahi LOTO hai.
03First Aid for Electric Shock
- Victim ko bare haath se na chhoedo
- Supply isolate karo ya wooden stick se hatado
- Breathing na ho to CPR + 108 ambulance
Shock se girre bandari ko local language mein 'DRABC' — Danger, Response, Airway, Breathing, CPR.
04Fire Fighting
- Class C = electrical fire
- CO₂ ya dry powder extinguisher use karo
- Paani kabhi nahi — current conduct karta hai
Oil-cooled transformer ke paas sand bucket aur dry powder extinguisher dono rakhe jaate hain.
Key Concepts
Revision ke liye ek nazar — exam se pehle yahi padhna hai.
- 01Electric shock occurs when current passes through the human body; even 50 mA (milliamperes) can be fatal — safe threshold is below 10 mA.
- 02The three classes of fire: Class A (wood/paper), Class B (oil/flammable liquids), Class C (electrical equipment) — use CO₂ or DCP extinguisher for Class C fires.
- 03PPE for electricians includes rubber gloves, safety goggles, safety shoes, helmet, and insulated tools — all mandatory on live-work sites.
- 04First aid for electric shock: Switch OFF power first, do NOT touch victim with bare hands, then apply CPR (Cardiopulmonary Resuscitation) if breathing stops.
- 05The golden rule of electrical safety: Always treat every conductor as LIVE until proven dead by an approved voltage tester.
Questions & Solutions
Pehle khud try karo — phir solution kholo. Yahi tariqa topper banata hai.
What is the minimum current level that can be fatal to a human being, and what is the safe threshold of current for the human body?
Name the type of fire extinguisher that should be used for an electrical (Class C) fire and explain why water should NOT be used.
List any four items of Personal Protective Equipment (PPE) used by an ITI Electrician and state the purpose of each.
Describe the correct first aid procedure to be followed when a person receives an electric shock at the workplace.
What is the 'Fire Triangle'? Name its three components and explain how a fire extinguisher works based on this concept.
Safety Practices and First Aid in ITI Electrician Semester 1 covers electrical hazards, PPE usage, fire classification and extinguisher selection, and first aid for shock and burns. Key exam points: 50 mA current is fatal, CO₂ extinguisher for Class C fires, switch OFF power before touching shock victim, and CPR involves 30 compressions plus 2 breaths. Always treat conductors as live.
Chapter-end quiz
4 MCQsOption tap karo — turant pata chalega sahi ya galat, explanation ke saath.
Q1.Which current value is generally considered fatal to the human body?
Q2.Which type of fire extinguisher is SAFEST to use on an electrical fire (Class C)?
Q3.What is the FIRST action to take when someone receives an electric shock?
Q4.Which PPE item specifically protects an electrician from electric shock during live-line low tension (LT) work?
Mark karo — dashboard par progress dikhega.