PRESENTATION of Basic Electrical Safety.ppt

Basic Electrical Safety

1. BASIC ELECTRICAL SAFETYBASIC ELECTRICAL SAFETY
ED CARLO G. RAMISED CARLO G. RAMIS
BET-ET-SLBET-ET-SL
PresenterPresenter

2. IntroductionIntroduction

Environmental, Health and Safety (EHS) developed this Environmental, Health and Safety (EHS) developed this
program to reduce exposures related to energized program to reduce exposures related to energized
electrical work, and to assure the safety of personnel who electrical work, and to assure the safety of personnel who
face a risk of electrical shock, arc flash events, or related face a risk of electrical shock, arc flash events, or related
injuries as part of their job duties.  This program complies injuries as part of their job duties.  This program complies
with the requirements and intent of the Occupational with the requirements and intent of the Occupational
Safety and Health Administration (OSHA) regulations and Safety and Health Administration (OSHA) regulations and
relies heavily on industry standards, such as the National relies heavily on industry standards, such as the National
Fire Protection Association’s (NFPA) 70E-2021 “Electrical Fire Protection Association’s (NFPA) 70E-2021 “Electrical
Safety in the Workplace”. The Electrical Safety Program Safety in the Workplace”. The Electrical Safety Program
also assures that all departments that perform electrical also assures that all departments that perform electrical
work on campus follow uniform work practiceswork on campus follow uniform work practices

3. Why Bother?Why Bother?

Every year around Every year around 1000 people 1000 people went to hospital went to hospital
emergency rooms to be treated for electrical emergency rooms to be treated for electrical
shocks and burns. Sadly, each year approximately shocks and burns. Sadly, each year approximately
30 of these accidents will be fatal Every Hundreds 30 of these accidents will be fatal Every Hundreds
of workers die every year from electrical shock.of workers die every year from electrical shock.

The amount of current to power a 5-watt lightbulb The amount of current to power a 5-watt lightbulb
is enough to kill three people.is enough to kill three people.

4. Voltage, Current, ResistanceVoltage, Current, Resistance

VoltageVoltage is the pressure or force that carries is the pressure or force that carries
the current. (Measure in Volts)the current. (Measure in Volts)

CurrentCurrent (amperage) is the amount of (amperage) is the amount of
electricity that flows. (Measure in Ampere)electricity that flows. (Measure in Ampere)

ResistanceResistance slows down the flow of electricity. slows down the flow of electricity.
(Insulator) (measure in ohms)(Insulator) (measure in ohms)

5. Current Vs. ResistanceCurrent Vs. Resistance

Metals are good conductors of current having very Metals are good conductors of current having very
low resistancelow resistance

Rubber, ceramics, and wood are poor conductors Rubber, ceramics, and wood are poor conductors
of current with very high resistance. (Why? There of current with very high resistance. (Why? There
is a BUT)is a BUT)

Materials with high resistance are often called Materials with high resistance are often called
insulators.insulators.

The human body can be a very good conductor or a The human body can be a very good conductor or a
very poor conductor. (It Depends On Voltage)very poor conductor. (It Depends On Voltage)

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

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

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

9. Electrical Shock InjuryElectrical Shock Injury
AmpsAmps MilliampsMilliampsInjuryInjury
11 10001000 Severe burnsSevere burns
0.10.1 100100 Irregular heart beat Irregular heart beat
(requires medical defibrillation)(requires medical defibrillation)
0.010.01 1010 Cannot release gripCannot release grip
0.0010.00111 Threshold of sensationThreshold of sensation

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

11. ENDEND