ELEC 1000 FINAL
1,000 Ω
According to IEEE 80, "Guide for Safety in AC Substation Grounding," the average resistance of a 150 lb man is ___.
205.2
According to NFPA 70E ___, one-line diagrams are required to be kept in a legible condition and updated.
2
According to NFPA 70E, the PPE category for operating equipment rated 240 V to 600 V is PPE Category ___ when enclosure doors are open and covers are not in place.
FALSE
According to OSHA, a written hazard assessment does not need to be certified.
amount of time an electrical tool is carrying a specific amount of current
Duty cycle is defined as the ___.
radiated
Most of the heat from an electrical arc is ___ heat.
26
The Restricted Approach Boundary for a 4160 V circuit is ___".
arc thermal performance value
The acronym ATPV stands for ___.
lack of lubricaton
The main cause of OCPD failure is ___,
14 AWG
What is the minimum extension cord conductor size that can be repaired?
The pivot point lubrication dries out due to current flow though the circuit breaker.
What is the most common reason for circuit breaker misoperation?
60
A Limited Approach Boundary of ___" is used when operating medium-voltage airbreak switches
proximity voltage tester
A ___ is a test instrument that indicates the presence of voltage by illuminating when the test tip is near an energized conductor or circuit part.
contains no voltage
An absence-of-voltage test is performed to verify that a conductor or circuit part ___.
equipotential
An area in which a person or the devices being used are at the same potential as the electrical system ground is a(n) ___ zone.
responsibility procedures principles [all of the above]
An electrical safety program should include a section on ___.
FALSE
An employee who has had training on the construction, operation, and associated hazards of low-voltage power circuit breakers would be considered qualified to work on medium-voltage metal-clad air-magnetic circuit breakers.
FALSE
An employer cannot be assigned more than one role per worksite.
troubleshooting
An energized electrical work permit is not required when ___.
performing energized electrical work
An energized electrical work permit is required by NFPA 70E for ___.
performing work on conductors or devices that are not in an electrically safe work condition
An energized electrical work permit is required when ___.
NFPA 70E Informative Annex J
An example of an energized electrical work permit is located in ___.
thermal energy at a working distances from an arc fault
An incident energy analysis is used to determine ___.
NFPA 70E
Electrical safety programs are addressed in ___.
year
Employers that include AED use in their emergency response plan must verify that employees have the proper AED training every ___.
deenergized
Energized conductors and decides must be ___ before any employee works on or near them.
a greater hazard is created by deenergizing
Energized work is permitted when ___.
a qualified person
Extension cords may only be repaired by ___.
FALSE
Flammable, nonmelting clothing work under arc-rated clothing and PPE increases the arc rating of the clothing system.
FALSE
Flexible cords can be repaired using heat-shrink tubing.
to install portable signs
Flexible cords may be used ___.
arc flash hazard analysis
For tasks not found in NFPA 70E Tables 130.7(C)(15)(A)(a) and (b), or when the maximum available short-circuit current or operating Tim exceeds the limits given in the tables, a(n) ___must be performed.
130.4(D)(a)
Minimum approach distances for qualified and unqualified persons for AC electrical power systems are found in NFPA 70E Table ___.
130.7(C)(15)(A)(b)
NFPA 70E Table ___ is used to determine the PPE category for a specific task for AC electrical systems.
130.7(C)(16)
NFPA 70E Table ___ lists the clothing and PPE required for each PPE category.
120.2(D)(2)
NFPA 70E ___ identifies a list of requirements employees must fulfilled when performing a complex lockout/tagout procedure.
instructor-led classroom on-the-job [both A and B]
NFPA 70E recommends ___ training for electrical workers.
hazards the host employer has communicated to the contract employer
NFPA 70E requires that the contract employer inform its employees of ___.
FALSE
NFPA 70E, normal operation of electrical equipment includes inserting or removing a circuit breaker.
TRUE
Nominal voltage can be found on the nameplates of electrical equipment.
has received training in and has demonstrated skills and knowledge in the construction and operation of electric equipment and installations and the hazards involved
OHSA defines a qualified person (electrical worker) as one who ___.
appropriate
OSHA 1910.335 directs employers to select and have each employee use PPE that is ___.
all electrical
OSHA 1910.335 refers to ___ PPE.
1910.333
OSHA ___ includes electrical lockout/tagout procedures.
deenergized
OSHA requires that all live parts to which an employee may be exposed be ___ before the employee works on or near them.
50
OSHA requires that an employee receive training if he or she will perform any task on or near exposed energized circuits or equipment ___ V or greater to ground.
FALSE
OSHA uses phase-to-phase voltages for unqualified approach distances to overhead power lines.
knowing how to organize materials
Occupations that expose employees to electrical hazards must have training that includes all of the following except ___.
50 V to 50 kV to ground
The minimum safe approach distance near overhead lines for an unqualified person is based on a voltage of ___.
FALSE
The only way for workers to be protected from electrical hazards is for them to wear the proper PPE for the task.
using a closed-style cord connector
The correct method used to prevent strain on joints or terminal screws of cord connectors is by ___.
TRUE
The host employer is expected to aggressively inspect, correct, and enforce safety on the job site.
maximum total clearing time of the OCPD
The primary factor that determines the Arc Flash Boundary is the ___.
lockout/tagout
The primary method required by OSHA for protecting qualified electrical workers from electrical hazards is ___.
TRUE
The process of placing a danger tag on the source of electrical power, which indicates that the equipment may not be operated until the danger tag is removed, is called tagout.
lockout
The process of removing the source of electrical power and installing a lock to prevent power from being turned on is called ___.
24
The required markings on flexible cords should be displayed every ___" or less.
electric shock
The requirements for knowing the minimum approach distances for a(n) ___ hazard are contained in OSHA regulations.
110.3(A)
The responsibilities of the host employer are covered in NFPA 70E ___.
obligations of the employees
The responsibility section of an electrical safety program identifies the ___.
FALSE
The safety team section of an electrical safety program identifies the written procedures that will be used for specific tasks.
racking
The task of removing and inserting drawout-type circuit breaker is commonly known as ___.
TRUE
The training section of an electrical safety program identifies all training required for contractors and vendors.
exposure of electrical hazards
The type and level of training required for an unqualified person working around energized electrical equipment depends on the ___.
vehicular or mechanical equipment is operating near uninsulated overhead lines
There is a risk of touch potential when ___.
110.2
Training of qualified and unqualified workers is covered in NFPA 70E ___.
42
A Limited Approach Boundary of ___" is used when operating equipment rated 240 V and less.
FALSE
Flexible cord connector blades and pins may be modified to match particular receptacles.
electroportation
Which of the following s not considered a recognized hazard associated with electricity?
Step potential
__ is a difference in voltage between each foot of a person when standing near an energized object.
Floor trippers
___ are used to open a medium-voltage air circuit breaker and discharge the closing springs when the circuit breaker is racked into or out of its cubicle.
STOP/START stations
___ cannot be used for isolating electrical equipment for lockout/tagout.
Insulated
___ hand tools are required when work got or near energized conductors or circuit parts.
NFPA 70E
___ is a voluntary standard for electrical safety-related work practices.
Electric shock
___ is the biggest hazard electrical workers face in most industries.
Electric shock
___ occurs when a worker makes contact with an energized conductor or circuit part.
Nominal
___ voltage refers to the design voltage of an electrical system.
FALSE
A backed voltage, or backed, is an unexpected voltage that is created by placing a reenergized conductor near a conductor that is energized and carrying a load.
the contact pivot point binds up
A common weakness with circuit breakers and switches is that ___.
-there are multiple energy sources -there are multiple crews on the job site -work is taking place at multiple locations [all of the above]
A complex lockout/tagout procedure is required when ___.
system voltage available short-circuit current arc current [all of the above]
A factor that goes into determine incident energy is ___.
least the 0.2
A good continuity reading between the grounding conductor and the frame of an electric tool is ___ Ω.
current
A ground fault circuit interpreter (GFCI)is a device that protects against electric shock by detecting an imbalance of ___ in the energized conductor and the neutral conductor.
TRUE
A qualified person must be trained in the skills and techniques to determine nominal voltage.
FALSE
A risk assessment analysis is a field document that accounts for only electrical hazards.
all
A risk assessment is a field document that accounts for ___ hazards.
TRUE
A safe work zone is established to exclude people who may be unqualified or unaware of a hazard.
FALSE
A simple lockout/tagout procedure is not required to be in writing.
year
A well-developed power tool maintenance program should include electrically testing the tool every ___.
TRUE
A written, documented electrical safety program is much more effective than a verbal one.
electrical safety program
A(n) ___ establishes the safety basis for all electrical work performed at a job site.
energized electrical work permit
A(n) ___ is a document that describes the job planning needed to perform energized electrical work safely.
equipotential zone
A(n) ___ is an area in which all conductive elements are bonded or otherwise connected together in a manner that prevents a difference of potential from developing within the area.
automatic transfer switch
A(n) ___ is used to reenergize electrical circuits.
ground
A(n) ___ mat may be used in an industrial substation to create an equipotential zone.
conductive
A(n) ___ object is any object that is not insulated for voltages to which it may be exposed.
automated external defibrillator
A(n) ___ passes an electrical current through the heart, causing the heart muscle to contract and briefly stop.
arc flash
A(n) ___ typically occurs when a conductive object makes contact between an energized conductor or circuit part and ground.
inspect the circuit to ensure it is safe
After an OCPD has been opened due to an automatic operation, it is required to ___ before closing the OCPD.
high-input impedance voltmeter
An induced voltage is measured with a(n) ___.
when continuously escorted by a qualified person
An unqualified person may cross the Limited Approach Boundary ___.
Limited Approach Boundary
An unqualified person may cross the ___ only if they are advised of the specific hazards and are continuously escorted by a qualified person.
10
An unqualified person must stay a minimum distance of ___' from energized overhead power lines 50 kV or less.
130.4(D)(b)
Approach boundaries for DC voltages are determines by using NFPA 70E Table ___.
FALSE
Arc blast can be estimated using equations developed y the IEEE P1584 work group.
by using the table method
Arc flash protective clothing and PPE are chosen by conducting gan incident energy analysis or ___.
10 mA to 16 mA
At ___, most people reach the let-go threshold, where muscle contractions are strong enough that they cannot release from contact with an energized conductor.
3 mA to 7 mA
At ___, most people realize they have been shocked and feel a painful sensation.
once per month
GFCIs should be tested ___ by pressing the PUSH TO TEST button on the receptacle.
TRUE
Ground mats are typically used in outdoor substations or at a gang-operated switch.
TRUE
If OCPDs are not properly maintained, they may not perform in accordance with manufacturer specifications.
108,300
If a 13,800 V transformer has a full-load current of 3,250 A and a 3% nameplate impedance, the available short-circuit current is ___ A.
doubled
If the time of exposure to an arc flash is doubled, the incident energy is ___.
folding the glove cuffs to prevent dirt and debris from entering
Improper storage of rubber insulating gloves includes ___.
FALSE
The approach distances listed in OSHA Table S-5 are only used for energized overhead power lines.
Inform the contractor responsible for the employee of the violation
In accordance with NFPA 70E Section 110.3(A), what is the host employer supposed to do if they observe a contracted employee violate safety policies?
1910.332
In order for an electrical worker to be considered qualified, he or she must meet the requirements in OSHA ___.
decreases by the inverse square of the
Incident energy ___ distance.
inverse square
Incident energy decreases by the ___ of the distance from an arc source.
FALSE
Insulated hand tools that show signs of damage may be repaired with electrical tape.
FALSE
It is acceptable for employees to use their own personal locks for lockout/tagout.
FALSE
It is acceptable to store rubber insulating gloves inside out.
replacing an identical OCPD
It is not required to update an arc flash rick assessment when ___.
FALSE
It is not required to verify that a circuit or equipment has been reenergized as long as all steps of the lockout/tagout procedure have been performed.
TRUE
It takes less electrical current to produce the same effect on women than it does on men.
open or loose seams
Items of inspection for rubber insulating gloves include all of the following except ___.
TRUE
Low-Voltage circuits routed through cable trays can induce a voltage into deenergized cables that are in the same cable tray.
Arc Flash Boundary Limited Approach Boundary [both A and C]
The boundary used to determine the safe work zone is the ___.
TRUE
One of the main reasons procedures are documented is so they can be reviewed by a qualified third party.
FALSE
Only NFPA committee members can draft a proposal and submit it to the NFPA
50
Only a qualified person is allowed to perform testing inside the Limited Approach Boundary when voltage are above ___ V.
nominal
Per OSHA 1910.332, a qualified person must be able to determine ___ voltage.
S-5
Per OSHA, clearance (safe approach) distances for qualified employees working on or near exposed energized electrical conductors or circuit parts can be determined by using Table ___.
stranded wire and junior hard service
Portable electric tools and flexible cords must be visually inspected ___.
FALSE
Removing covers and panels from electrical enclosures has an HRC rating or 0.
a long-sleeve cotton or arc-rated shirt and pants
Required PPE for PPE Category 2 task includes all of the following except ___.
FALSE
Rubber insulating gloves are not required for voltages less than 300 V when there is a possibility of contact with energized conductors or circuit parts.
-using at least two people -installing handles -deenergizing equipment inside the enclosure [all of the above]
Safely removing panels and covers from a switchgear enclosure involves ___.
TRUE
Safety glasses for electrical workers must be UV rated.
-the name of the worker who placed the tag -the phone number of the worker who placed the tag -the length of time the equipment is expected to be out of service [all of the above]
Tags used for lockout/tagout may include ___.
1.2 cal/cm^2
The Arc Flash Boundary is the distance at which the incident energy equals ___ for all voltages.
recognized
The General Duty Clause in Section 5(a) of the OSHA regulations states that each employer shall furnish to each of his employees employment and a place of employment, which are free from ___ hazards.
42
The Limited Approach Boundary for a 480 V circuit is ___".
FALSE
The Limited Approach Boundary for removing or installing an MCC bucket is 48".
TRUE
The Limited Approach Boundary for replacing low-voltage motors is 42".
TRUE
The Limited Approach Boundary is the distance from an exposed energized conductor or circuit part at which a person can get an electric shock and is the closest distance an unqualified person can approach.
4
The Multi-Employer Worksite Policy from OSHA categorizes employers into ___ roles.
130
The NFPA 70E standard that covers the selection of PPE and equipment in Article ___.
Arc Flash
The ___ Boundary is the distance from exposed energized conductors or circuit parts where a person would receive the onset of second-degree burns on bare, unprotected skin.
Arc Flash Boundary
The ___ is the distance from exposed energized conductors or circuit parts where bare skin would receive the equivalent to 1.2 cal/cm^2
energy breakopen threshold
The ___ is the point at which a fabric allows a 1" crack of a 1/2" hole, but no burn is registered.
controls
The ___ section of an electrical safety program identifies components that are used to reduce exposure an employee may have to hazards.
scope
The ___ section of an electrical safety program identifies the employees for which the electrical safety program applies, such as in-house personnel, contractors, and vendors.
TRUE
Under no circumstances can an unqualified person cross the Restricted Approach Boundary.
how to identify hazards and how to avoid those hazards
Unqualified workers must be trained in ___.
4
Using NFPA 70E Table 130.7(C)(15)(A)(a), the PPE category for inserting or removing a 480 V MCC bucket or cubicle is PPE Category ___.
FALSE
Using NFPA 70E Table 130.7(C)(15)(A)(a), the PPE category for operating a 480 V MCC with the doors closed is PPE Category 4.
It allows the device closest to the load to operate first (selective tripping).
What is the purpose of a short-time delay function on circuit breakers?
milliamps (mA)
When a person receives an electric shock, the current through the body is measured in ___.
OCPDs cannot be modified at any time except for what is allowed in codes and standards
When are overcorrect protective devices (OCPDs), such as fuses, circuit breakers, and protective relays, allowed to be modified?
FALSE
When assessing the risk associated with an electrical task, the age of the electrical equipment being worked on is not a factor.
-the equipment has no mens of accepting a lock -tagging procedures provide a level of safety equivalent to a lock [both A and B]
When isolating electrical equipment, OSHA allows the use of a tag without a lock when ___.
FALSE
When operating equipment rated 240 V to 600 V, an arc-rated clothing system with a minimum rating of 40 cal/cm^2 is required.
4
When removing or installing MCC buckets, the arc-rated clothing and PPE category recommended by NFPA 70E Tables 130.7(C)(15)(A)(a) and (b) is PPE Category ___.
not mandated
When testing for the absence of voltage on circuits rated 120 V and less with no exposure to greater than 120 V, the recommended arc-rated clothing and PPE is ___.
TRUE
When there are multiple voltages inside a single enclosure, the highest exposed voltage is used to determine the shock hazard.
4
When troubleshooting conductors or circuit parts rated 240 V and less, an arc-rated clothing systems with a minimum rating of ___ cal/cm^2 is recommended by NFPA 70E.
TRUE
When working in a confined space, doors, hinged panels, and other covers must be secured so they do not close or make contact with an employee working inside the space.
noncontact voltage tester
Which of the following devices is not recommended for performing absence-of-voltage tests?
sparking
Which of the following is not a common defect to look for when inspecting portable electric tools and flexible cords?
asphyxiation
Which of the following is not a recognized hazard of electricity?
locks and tags
Which of the following is not an approved alerting technique used to warn and protect personnel from potential hazards, such as electric shock, burns, or electrical equipment failure, that can result in injury?
