Safety For Electricians Flashcards
OSHA name for the most Dangerous things on Job sites.
Focus Four or Fatal Four
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What percent age of Deaths are caused by the Fatal Four
90%
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Fatal Four and include the following
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• Fall hazards - Falling from heights
• Electrical hazards — Electric shock and burns from touching energized electrical conductors
• Caught-in or -between hazards - Being crushed by falling materials or equipment
• Struck-by hazards - Being hit by flying objects or moving equipment, such as trucks, forklifts, and other construction equipment
What is electric current
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Electricity is something that causes electrons to move in a conductor. This
aluminum are good conductors.
movement is called electric current. Metals such as silver, copper, steel, and
Is a human body a conductor
Yes
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What is a mA
The unit of measure represented by mA is a milliampere (or milliamp). One milliampere is equal to one thousandth of an ampere.
Who does the current of 1 mA (0.001A) affect the human body?
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Shock that can be felt, like a little tingling
How does the current of 5 mA (0.005A) affect the human body?
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Slight shock that may cause you to react by jumping or falling, which may result in injury
Hire does the current of 6-30 mA (0.006-0.030A) affect the human body?
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Painful shock which causes you to lose control of your muscles
How does the current of 50-150 mA (0.050-0.150A) affect the human body?
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Extreme pain and severe muscle contractions which may cause you to stop breathing and possibly die
How does the current of 1,000-4,300 mA (1-4.3A) affect the u human body?
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Dangerous heartbeat pattern, severe muscle cramping, and nerve damage, from which you will likely die
What a Double-insulated/ungrounded tools?
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Double-insulated/ungrounded tools:
Electrical tools that are constructed so that the case is insulated from electrical energy. The case is made of a nonconductive material.
What’s a Ground Fault Circuit Interrupter
(GFCI)?
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Ground Fault Circuit Interrupter
(GFCI): A device that protects people and equipment by de-energizing a circuit within an established period of time when a ground fault current exceeds the values established for a Class A device (4-6 mA).
What High Voltage??
More the 1,000V
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What’s this symbol
Ohms
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What is a shock
When a human body become part of an electrical current..
what is the Hand to hand resistance?
1000 ohms
when a current enter the body how does it leave?
it enter in one place and leaves out another
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what level of voltage is the number you should start using protection?
50 volt of higher
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what 3 parts of the body do electrical currents effect ??
Skin, heart, body
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what protein in the body provide the body with electrical resistance?
keratin
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what can happen when the heart receives out side electrical shock
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the heart can stop beating and quiver instead in a process called fibrillation.
what can happens to the muscle when shocked
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the could lose control of there muscle because of shock to the nervous system. and this is why some people cant let go of the things that is shocking them sometime.
what is the most common injury people get when the get shocked
BURNS
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what are the types of Burn
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- electrical Burns
- Arc Burn
- thermal contact Burns
what is a electrical burn
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the heat from the electical current burns you from the inside out.
what is a Arc
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when a electrical current jumps through the air from one part of the circuit to another. (When you touch that its call ARC BURN)
how hot can metal from a arc get
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35000f (4 times hotter then the sun
how can electric arcs happen
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because of bad Electrical contact or poor insulation/ or when a current flow through a vaporized terminal material like carbon of metal
what’s is OHM’s law?
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a way to figure out one of 3 thing in a Electrical system. Voltage, Current, and resistance.
what is (E)?
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Voltage (E) - A measure of difference of electric potential.
what is (I)
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Current (I) — A movement of electrons.
Whats is (R)
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Resistance (R) - A material’s opposition to the flow of electric current.
how do you find the VOLTAGE?
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To find the voltage, multiply the current by the resistance using the following formula:
Ix R= E
how do you find the Current?
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To find the current, divide the voltage by the resistance using the following formula:
E/R=I
how do you find the Resistance?
To find the resistance, divide the voltage by the current using the following formula: E/I=R
what is a thermal Contact Burn?
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Thermal contact burns can happen when someone touches a hot object thrown during a blast from an electric arc. If you are in the way of a flying piece of molten metal, you may get a thermal contact burn.
what are the primary Hazard Associated with blast from an Electric Arc.
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1. Sound and Pressure Waves (hearing)
2. Intense Light
3. Shrapnel (impaled
4. vaporized copper (inhaled)
5. molten metal
6. out air,
when must a person when must a something be be marked quality person only?
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NEC Section 110.16 requires that all switchboards, switchgear, panelboards, industrial control panels, meter socket enclosures, and motor control centers be clearly marked to warn qualified persons of potential electric arc flash hazards.
what is NEC SECTION 110.16(b)
NEC Section 110.16(B) requires a permanent arc flash label be field or factory supplied to service or feeder-supplied equipment rated 1,000A or more.
When should you test before touching a electrical conductor
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Always
How do you determine if a circuit is energized?
Live - dead- live test
What are the 3 primary causes of Electrical incidents
• Unsafe conditions
• Unsafe equipment
• Unsafe actions
What is Cfr
When you see the letters CFR, then you know you are looking at OSHA regulations.
List some of the most common safety equipment
• V-rated tools
• Tested rubber protective equipment, including gloves, sleeves, and blankets
• Arc-rated apparel
• Natural fiber clothing for underlayers
• Electrical hot sticks
• Fuse pullers
• Footwear designed to protect against electrical hazards
• Safety glasses
• Face shields and switching hoods
• Hard hats
• Hearing protection
What kind of hard hat do you use for High Voltage Hazard.
Class E hard hats have the highest rating and are tested to withstand 20,000VAC for a period of three minutes.
What is an Ozone?
Ozone (O3) is a form of oxygen produced from an electrical field. It is in the air surrounding a conductor with high voltages. Normally, you find ozone at voltages of 10 kV and higher.
Voltages that high are in electric utility transmission and distribution systems.
How many types of Rubber Protective equipment is there?
TYPE 1 VULCANIZED NATURAL AND SYNTHETIC RUBBER
TYPE 2 OZONE RESISTANT (MUCH STIFFER NOT EASLIY WORN
What are the rubber protective equipment Classifacation For ANSI and (Astm)
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Class 00 (beige tag) 500VAC/750VDC
Class 0 (red tag) 1,000VAC/1,500VDC
Class 1 (white tag) 7,500VAC/11,250VDC
Class 2 (yellow tag) 17,000VAC/25,500VDC
Class 3 (green tag) 26,500VAC/39,750VDC
Class 4 (orange tag) 36,000VAC/54,000VDC
what is the leather protector of the rubbergloves for
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Burn protection
how do you know your gloves are not inside out
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serial number and size on the out side
how often do rubber gloves have to be checked?
every 6 months
wha must you do before wear rubbergloves
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Inspect and Check
air check or glove inflator
what do Maintenance tech you use to cover equiptment
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insulated blankets
what do maintenance techs use to cove the floors
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Switchboard matting
what type of clothing should you never wear when doing electric work?
Synthetic fibers: acrylic, polster, nylon
what is a hot stick?
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a insulated tool designed for disconnecting switched and removing and inserting switch and applying temp ground and testing. made to provide distance between me and energiezd parts
how you de-energies circuit with a capacitors installed?
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with a Discharge probe
what are the osha Standard for Employers
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* OSHA Standard 29 CFR 1910.331 through 1910.335 covers electrical safety-related work practices.
* OSHA Standard 29 CFR 1910.332 requires training for all employees exposed to electrical shock.
what are the OSHA standard for emplyees
- CFR 1926 — standard for the construction industry
- CFR 1910 - standard for general industry
CODE: Ground-Fault Protection for Personnel
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CODE:Splices
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Code:Flexible Cords and Flexible Cables
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NEC Table 400.4
Code:GFCI Protection
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NEC Section 590.6(B)(1)
Code:Assured Equipment Grounding
Conductor Program
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NEC Section 590.6(8/(2)
How many Chapters are there in NFPA 70E ?
Three
* Chapter 1, Safety-Related Work Practices
* Chapter 2, Safety-Related Maintenance Requirements
* Chapter 3, Safety Requirements for Special Equipment
what is Napa 70E specific approach distance limits to exposed eneregized parts called?
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Approach boundaries
An approach distance limit from exposed energized electrical conductors or circuit parts within which a person could receive a second-degree burn if an electric arc flash were to occur.
Arc flash boundary (AFB):
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: An approach distance limit from an exposed energized electrical conductor or circuit part within which a shock hazard exists.
Limited approach boundary
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Restricted approach boundary:
An approach distance limit from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electric shock.
A study investigating a worker’s potential exposure to arc flash energy conducted by a qualified worker for injury prevention, determination of safe work practices, and appropriate levels of PPE.
Arc flash risk assessment:
how many electrical shock Protection boundaries/ limits of approach are there?
- Limited approach Boundary (for qualified Person only)
- Resistricted Approach boundary (for qualified person only and they must have on proper PPE)
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