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1. Basic Electrical Safety
By Greg Bock
PLU Electrician

2. Why Bother?
In 1997, over 12,000 people went to hospital
emergency rooms to be treated for
electrical shocks and burns.
Hundreds of workers die every year from
electrical shock.
The amount of current to power a 5-watt
lightbulb is enough to kill three people.
One of your co-workers was injured last
year by electricity.

3. Voltage, Current, Resistance
Voltageis the pressure or force that
carries the current.
Current(amperage) is the amount of
electricity that flows.
Resistanceslows down the flow of
electricity.

4. Current Vs. Resistance
Metals are good conductors of current
having very low resistance
Rubber, ceramics, and wood are poor
conductors of current with very high
resistance.
Materials with high resistance are often
called insulators.
The human body can be a very good
conductor or a very poor conductor.

5. Factors Affecting the
Conductivity of the Human Body
Condition of the skin: Is it wet, dry, greasy?
Health of Individual
Duration of Contact with Electricity
Part of the Body contacted

6. See Do’s & Don’ts Handout

7. More Do’s & Don’ts
Keep electrical equipment away from water
sources
Use a C-rated fire extinguisher on
electrical fires and shut off power source
Remove frayed or damaged equipment and
cords from service
Remove plugs by pulling the plug; not the
cord.

8. See Extension Cord Handout

9. Grounding Electrical Equipment
Grounding functions to conduct current
leaks to the earth or ground.
A grounded cord is a 3-wire plug and
requires a 3-way receptacle.
Double-insulated equipment does not
require grounding.

10. Electrical Shock Injury
AmpsMilliampsInjury
1 1000 Severe burns
0.1100 Irregular heart beat
(requires medical defibrillation)
0.0110 Cannot release grip
0.0011 Threshold of sensation

11. See Electrical Shock Handout

12. Summary
Even low voltage electricity can cause
injury.
Your body can be a good conductor of
electricity, especially when wet.
Follow the Ground Rules of electricity.
Do not use defective equipment.

13. Electrical Safety
Quiz