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Electrically powered equipment can pose a significant hazard to workers, particularly when mishandled or not maintained. Many electrical devices have high voltage or high power requirements, carrying even more risk.
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Description
Electrical Shock Hazards
The major hazards associated with electricity are an electrical shock, fire and arc flash. Electrical shock occurs when the body becomes part of the electric circuit, either when an individual comes in contact with both wires of an electrical circuit, one wire of an energized circuit and the ground, or a metallic part that has become energized by contact with an electrical conductor.
The severity and effects of an electrical shock depend on a number of factors, such as the pathway through the body, the amount of current, the length of time of the exposure, and whether the skin is wet or dry. Water is a great conductor of electricity, allowing current to flow more easily in wet conditions and through wet skin.
The effect of the shock may range from a slight tingle to severe burns to cardiac arrest. The chart below shows the general relationship between the degree of injury and the amount of current for a 60-cycle hand-to-foot path of one second's duration of the shock. While reading this chart, keep in mind that most electrical circuits can provide, under normal conditions, up to 20,000 milliamperes of current flow.
Current
Reaction
1 Milliampere
Perception level
5 Milliamperes
Slight shock felt; not painful but disturbing
6-30 Milliamperes
Painful shock; “let-go” range
50-150 Milliamperes
Extreme pain, respiratory arrest, severe muscular contraction
1000-4,300 Milliamperes
Ventricular fibrillation
10,000+ Milliamperes
Cardiac arrest, severe burns, and probable death
In addition to the electrical shock hazards, sparks from electrical equipment can serve as an ignition source for flammable or explosive vapors. Arc Flash A hazardous arc flash can occur in any electrical device, regardless of voltage, in which the energy is high enough to sustain an arc. Potential places where this can happen include: Panelboards and switchboards Motor control centers Metal-clad switchgear Transformers Motor starters and drive cabinets Fused disconnects Any place that can have equipment failure In an arc flash incident, an enormous amount of concentrated radiant energy explodes outward from electrical equipment. The explosion creates pressure waves that can damage a person’s hearing, a high-intensity flash that can damage their eyesight and a superheated ball of gas that can severely burn a worker’s body and melt metal.
Course content
Section 1
Electrical Safety
00:25:00
Special Training
00:10:00
Hazards
00:10:00
Safe Work Practices
00:10:00
Lock & Tag
00:10:00
If a Lock cannot be Applied
00:10:00
Section 2
Release Stored Energy
00:10:00
Dead
00:10:00
Check your Tester
00:10:00
Re-energizing Equipment
00:10:00
Energized
00:10:00
Section 3
Working on Energized Circuits
00:10:00
Conductive Materials
00:10:00
Conductive Apparel
00:10:00
Portable Electric Tools
00:10:00
Visually Inspect
00:10:00
Section 4
Remove from Service
00:10:00
Attachment Plugs
00:10:00
Ladders
00:10:00
Test Instruments
00:10:00
Instrument Ratings
00:10:00
Section 5
Personal Protective Equipment
00:50:00
Tools & Equipment
00:10:00
Work Area Safety
00:10:00
Alerting Others
00:10:00
Conductive Work Locations
00:10:00
Section 6
Electrical Systems
00:20:00
Overcurrnet Protection
00:10:00
System Markings
00:10:00
Circuit ID
00:10:00
Its Your Job
00:10:00
Safety Instructions
Importance Of Health And Safety In The Workplace
FREE
00:10:00
Basic Health & Safety at Workplace Video
FREE
00:20:00
Understanding Global Standards
Purpose of the Standards Around the World
FREE
00:30:00
British Standards
FREE
02:00:00
European Standards
FREE
02:00:00
Practical assignments
Electrical Safety Checklist
4 weeks
Fire Risk Assessment
4 weeks
Quiz
General Electrical Safety Training Test
00:45:00
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