ELECTR

ICAL S

AFETY

TRAIN

ING

AFFECTE

D PERSONNEL

Electrical Standards

• OSHA CFR 1910 Subpart S• NFPA 70E

Scope

• Establish guidelines where reasonable and adequate methods are utilized to assure protection from Electrical Shock, Arc, and Blast hazards for employees and contractors who are required to perform work in vicinity of exposed, or energized circuits.

Responsibility

• An effective electrical safety program is important. You must have a clear understanding of the program, use safe work practices, and involve affected employees in the program.

• Your Maintenance Manager is responsible for safety planning and authorizing work on live electrical equipment.

Definitions

Affected Employees

• Employees who, in the course of performing their assigned tasks, come in contact with electrical power sources, tools, and portable electrical powered devices generally found in workplace

Definitions

Affected Employees are trained in:•Ability to recognize potentially hazardous energy and its potential impact on workplace conditions•Proper handling and use of portable electrical equipment associated with their job•Proper techniques for opening and closing circuits, and necessary procedures to follow before replacing fuses or resetting breakers when associated with their jobs

Hazards of Electricity

• Shock

• Arc

• Blast

Hazards of Electricity

Shock•Electrical Shock is a physical stimulation that occurs when electrical current passes through body•Its effects depend upon:

Magnitude of current flow Body parts through which

current flows General physical condition

of person being shocked

Hazards of Electricity

Shock and body part physiology•Skin

Has a breakdown voltage Burns

•Heart 75 milliamps affects beating Muscle• Loss of muscular control•Burns

Hazards of Electricity

Arc•Electric arcing occurs when a substantial amount of electric current flows through what previously had been air. It is an enormous amount of concentrated radiant energy creating a high intensity blast

Temperature and Heat Data

•Temperature at arc terminals•Curable burn temperature (1/10 sec)

•Cell death temperature (1/10 sec)

•Temperature of burning clothing•Clothing ignition temperature•Temperature of metal droplets•Temperature at suns surface

• 35,0000 F

• 1450 F

• 2050 F

• 1,4000 F

• 7000 F - 1,4000 F

1,8000 F

• 9,2600 F

Factors Affecting Injuries Due to Electric Arc

• Distance From the electrical source

• Absorption Body make up

• Temperature Electricity travels faster through cool

air• Time

Exposure duration

Hazards of Electricity

Blast•Blast comes from the pressure developed by the near instantaneous heating of the air surrounding the arc and from the expansion of the metal as it is vaporized.•Blast hurls people•Knocks down walls•Ejects projectiles

Hazards of Electricity

Summary of causes for injury and death

•Injury Reflex action can cause falls Nerve damage Burns Blindness Loss of hearing Organ dysfunction

Hazards of Electricity

Causes of Death•Electrically induced shock causes fatal;

Internal and external burns Lungs damaged from inhaling

superheated plasma and molten products

Heart failure

Safe Work Practices

• Live parts operating at 50 volts or above, to which an employee may be exposed, shall be de-energized before work is done on or near them, unless employee can demonstrate that de-energizing introduces additional or increased hazards

• Decision to work energized (other than electrical measurements) will be made on a case by case basis after all efforts have been made to de-energize equipment during pre-job safety planning

Safe Work Practices

When working on energized parts…•Energized work performed after all safety planning for task has been completed•Who will be performing the work?•What additional PPE is required (insulated gloves, goggles, etc.)•Document why work could not be performed under ZES or a predetermined IES

Safe Work Practices

• Prior to beginning work on or near exposed energized parts, all persons involved shall be briefed on precautions

• When work conditions or methods change that could potentially compromise safety, additional safety planning is required

Safe Work Practices

• Persons performing work on exposed energized equipment and parts shall have at least one other person within sight or sound, who is knowledgeable of emergency reporting procedures.

Safe Work Zone

• Areas around electrical equipment with emphasis on those with access doors and panels must be kept clear of materials, equipment, or any other articles that deter access to electrical equipment.

Understanding Electrical Hazards

• Most jobs involve electricity which creates importance to understand how to avoid electrical shock

• Numerous types of electrical hazards, depending on equipment in use.

• While machines have high and low voltage sources, electrical shocks from an overloaded transmission line or an incorrectly grounded power tool, results can be equally fatal

Understanding Electrical Hazards

• When electricity enters the body, it can effect our heartbeat, brain function, and breathing possibly causing immediate death or serious injury

• Under certain conditions, even small amounts of electricity can cause death.

• Never take any electrical device for granted.

Tips To Avoid Shock

• Ensure all electrical equipment is in good repair.

• Report problems so equipment can be repaired or replaced

• Only those authorized and qualified do repairs on electrical equipment. Fatal accidents have been caused by poorly repaired equipment.

• Use only correctly grounded equipment. Never use a three-pronged cord missing 3rd prong.

Tips To Avoid Shock

• Ensure grounding connections are secure

• Look for damaged, worn or broken wires and connections

• Use a Ground Fault Circuit Interrupter (GFCI) when using electrical equipment outdoors or in a damp area. Do not use submerged in water. Do not handle any electrical equipment, including cords and plugs, with wet hands.

Tips To Avoid Shock

• When unplugging a cord, pull on plug instead of the cord

• Never use a ladder made of aluminum or one with metal reinforcement when doing any electrical work. This includes changing a light bulb.

Tips To Avoid Shock

• Determine if there are overhead hazards such as power lines and electrical installations. Take precautions to avoid contact with objects such as a ladder, pole or pipe.

• Don’t ever use water on an electrical fire. Use only extinguishers designed specifically for electrical fires. Know where to locate and how to use extinguishers in your workplace.

Home Safety

• Cover unused electrical outlets to keep little hands safe

Home Safety

• Lock Breaker Panels

Home Safety

• Don’t create unnecessary hazards

Home Safety

• Unplug shop lights before changing bulbs

• Turn off light before replacing bulb

• Follow manufacturer’s recommendation for bulb wattage

Home Safety

• Dry your hands before operating electrical devices

• Clean up spills

Home Safety

• Avoid contacting electricity in wet conditions

• Turn off breaker before handling exterior cords

Quiz

Electrical Hazards include:

•Shock

•Arc

•Blast

Factors affecting injuries due toelectric Arc are:

•Distance•Absorption•Temperature•Time

All live parts operatingat 50 volts or above must be before work canbe performed.

de-energized

Persons performing work on exposed energized equipment and parts shall have at least one other person within sight or sound, who is knowledgeable of emergency reporting procedures.

True or False

True

A metal ladder can be used when doing electrical work.

True Or False

False

Use a Ground Fault Circuit Interrupter (GFCI) when usingelectrical equipment outdoorsor in a damp area.

True or False

True

Water is to be used on electrical fires.

True or False

False

What’s wrong with this picture

Questions