1 Gas and Electrical Safety 2 Chemical/Physical Properties of Natural Gas
Lighter than air
1000 Deg. F
Required by OSHA
3 Responding to Blowing Gas Emergencies
Emergency Response Services
Gas escaping outsidenot burning
Gas Escaping outsideburning
Gas escaping insidenot burning
Gas escaping insideburning
4 NorthWestern Energy Response 5
Then there is electricitythe demon the angel the mighty physical power the all-pervading intelligence! Is it a factor have I dreamt itthat by means of electricity the world of matter has become a great nerve vibrating thousands of miles in a breathless point of time
The House of the Seven Gables ch. 17
6 What Is Electricity
Form of Energy
Energy is Power
7 Where Does Electricity Come From
Smaller power lines
Wires inside walls
Outlets and switches
8 Electricity Travels Through Conductors
Electricity travels at the speed of light
186000 miles per second
9 Insulators Keep Electricity Where it Belongs
Break or disconnect
10 How Electricity Acts
Think of electricity as water
Reservoir Pipes Pump
Generator Electric Conductors Pressure (Voltage) Generator
Voltage is the pressure causing the current (electrons) to move through the wire
10 gallons per second
11 How Electricity Acts 12 Electrical Safety
What are the hazards
5th leading cause of death
411 deaths per year
How can a worker be exposed or put at risk
Present at most jobsites
Workers exposed to electrical energy daily
Broken light bulb
Overhead power lines
13 How Electricity Affects the Body
Amperage is the most destructive factor in electrical accidents.
Electrical Injuries consist of four main types
Falls caused as a result of contact with electrical energy
For death to occur
Body must become part of an active electrical circuit
Extent of injuries
Depends on the currents magnitude (amperage) the pathway of the current through the body and the duration of current flow through the body
14 How Electricity Affects the Body
5 Milliamps is the trip setting for GFCI protection
60 Milliamps is the current required to light a 7.5-Watt light bulb
800 Milliamps is required to power a 100-Watt light bulb
8000 Milliamps is required to power a 1000-Watt hair dryer
15 Electrical Injuries May Occur in Various Ways
Falls from heights
16 Effects of Contact to the Body
Small superficial injury
Destroys subcutaneous tissues
Internal blood vessels may clot
Nerves in the contact area may be damaged
Muscle contractions may cause skeletal fractures
Temperatures in excess of 1800 degrees F
Hot enough to vaporize skin instantly
17 Accident Statistics
12 of all construction accidents
50 Heavy Equipment
Distribution lines hit most frequently
90 involve overhead
Typically ground helper injured
18 Overhead Power Lines 19 Mobile Equipment
Limit of approach
For every kV increase increase the distance by 0.4 inch
20 Power Line Approach Guidelines
Always observe Limit of Approach
Use a signalman
Consider all Power Lines as Live!
Notify NWE when operating near a Power Line
Keep personnel away from equipment when near the Limit of Approach
Use warning devices
Consider long spans and wind
21 Always Call Before You Dig!
Two business days before you dig.
22 (No Transcript) 23 (No Transcript) 24 If Contact Occurs 25 If Contact Occurs V1 Touch Potential V2 26 If Contact Occurs Step Potential V2 V3 27 If Contact Occurs 28 Other Options After Contact 29 Other Considerations
30 Other Considerations
31 Other Considerations 32 Poles 33 (No Transcript) 34 Remember
Electricity will flow through conductive material.
Never let any object within the Limit of Approach.
When machinery touches power lines all metal parts become electrified.
If power lines break and fall onto communication wires fences or other metal objects these also become energized.
In an emergency always assess the situation and dont panic and get tunnel vision.
Be aware of the location and clearance of power lines at all times.
ALWAYS treat power lines as if they are energized!
35 (No Transcript)
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