This document outlines electrical safety precautions and effects of electric shock on the human body. It notes that the current and resistance determine shock effects, from bearable at 1mA to fatal above 200mA. Key safety points include always using switches in the live wire, three-pin plugs, avoiding joints in wires, not touching electricity with wet hands, using proper insulation and tools, and disconnecting power before repairs. Circuit breakers and properly rated fuses provide protection from overloads and shorts.

1. SAFETY PRECAUTIONS FOR ELECTRICAL
APPLIANCES

2. ELECTRICAL SAFETY

3. EFFECTS ON THE HUMAN BODY
Depends on :
•Current and Voltage
•Resistance
•Path through body
•Duration of shock

4. CURRENT AND BODY RESISTANCE
• 1mA to 8mA – Bearable
• 8mA to 15mA - Painful shock
• 20mA to 50mA – Stop breathing
• 100mA to 200mA – Damage of
heart
• Above 200mA – Burn out the
body and stop breathing
• Wet Situation – Low resistance
(700 ohm to 1000
ohm)
• Dry Situation – High resistance
(70000 ohm to 100000
ohm)

5. POINTS TO REMEMBERED FOR ELECTRICAL
SAFETY

6. • Always use the switch in Phase – wire instead of neutral wire
• Always use 3 pin plug in socket

7. • There should be no joints in wire / cables (minimum Possible)

8. • Never touch any electric equipment with wet hands and never touch any
electrician working on electrical installation

9. • Always use good insulation wires and good insulation tapes, also
use proper tools. Do not use simple tapes.

10. • Never use pliers / screw of poor quality and poor insulation

11. •And Many
Other……
• Treat all electrical devices as if they are live or energized. You
never know.
• Disconnect the power source before servicing or repairing
electrical equipment.
• Use only tools and equipment with non-conducting handles
when working on electrical devices.
• Never use metallic pencils or rulers, or wear rings or metal
watchbands when working with electrical equipment

12. • If an individual comes in contact with a live electrical
conductor, do not touch the equipment, cord or person.
Disconnect the power source from the circuit breaker or
pull out the plug using a leather belt.
• Do not wear loose clothing or ties near electrical
equipment.

13. PROTECTION

14. CIRCUIT - BREAKERS
• A. Miniature circuit Breakers
(M.C.B)
• B. Earth Leakage Circuit
Breakers (E.L.C.B)

15. • Use M.C.B and E.L.C.B for overload and short circuit at
mains & at power point

16. FUSES
• Always use proper rating of
fuses