ISA Utility Specialist (Ch. 5: Electrical
Knowledge)
What is a volt? - ANSa unit of electrical force
Electrical resistance determines how much __________ is required to move electricity along a
conductor and is measured in __________. - ANSenergy;
ohms
A conductor carrying more than __________ volts would be considered a NERC line. -
ANS200,000
2 examples of protective equipment: - ANScircuit breakers
lightning receptors
An energized wire or conductor in a circuit is also known as a __________. - ANSphase
True or False?
Guy wires are intended to help support poles but may become unintentionally energized. -
ANStrue
A __________ is similar to a fuse or cutout, but it resets after a predetermined time period. -
ANSre-closer
Minimum working distances for qualified line-clearance arborists are specified in the
__________ safety standard. - ANSANSI Z133
When installing underground conductors, __________ should be used in tree root protection
zones. - ANStunneling
Distribution transformers typically __________ primary circuit voltage for the end user. -
ANSreduce
Amp: - ANSthe measure of electrical current
Service lines and secondary distribution lines usually carry voltage between
__________-__________ volts. - ANS120-240
When a tree contacts one electrical conductor, it may cause a __________-to-__________
fault. - ANSphase-ground fault
, The minimum approach distance for non-qualified line clearance personnel from energized
conductors 50 kV and less: - ANS10 feet
The condition that allows electricity to flow from one object to another is called: - ANSpotential
What is a Watt? - ANSa measure of electrical power
A phase-to-phase fault occurs when there is contact between: - ANStwo or more energized
conductors
If the coating on a weatherproofed conductor falls off, the conductor will often __________. -
ANSdeteriorate
Ohm's Law describes the relationship between: - ANSvoltage, current, & resistance
Formula for Ohm's Law: - ANSVolts = Amps x Resistance
(V = I x R)
Formula for power: - ANSPower = Volts x Current
(P = V x I)
A __________ is another name for a generating plant, and is the source of most power in the
U.S. The most common sources for this power are __________ __________, __________ or
__________ turbines, & __________ __________. - ANSpowerhouse;
fossil fuels, wind or water turbines, & nuclear reactors
Tree-caused physical damage to conductors, electrical equipment, and/or supporting structures
is an example of a __________ failure. - ANSmechanical
The most common type of wire used today is an aluminum wire with a steel reinforced core.
This wire is known as: - ANSACSR (Aluminum Conductor Steel-core Reinforced)
Voltage Ranges:
Extra-high transmission lines: __________-__________ volts
Transmission lines: __________-__________ volts
Subtransmission lines: __________-__________ volts
Distribution lines: __________-__________ volts - ANS345,000-765,000 volts
115,000-230,000 volts
23,000-115,000 volts
2,400-23,000 volts
The voltage between the feet of a person standing near an energized, grounded object: -
ANSstep-potential
Knowledge)
What is a volt? - ANSa unit of electrical force
Electrical resistance determines how much __________ is required to move electricity along a
conductor and is measured in __________. - ANSenergy;
ohms
A conductor carrying more than __________ volts would be considered a NERC line. -
ANS200,000
2 examples of protective equipment: - ANScircuit breakers
lightning receptors
An energized wire or conductor in a circuit is also known as a __________. - ANSphase
True or False?
Guy wires are intended to help support poles but may become unintentionally energized. -
ANStrue
A __________ is similar to a fuse or cutout, but it resets after a predetermined time period. -
ANSre-closer
Minimum working distances for qualified line-clearance arborists are specified in the
__________ safety standard. - ANSANSI Z133
When installing underground conductors, __________ should be used in tree root protection
zones. - ANStunneling
Distribution transformers typically __________ primary circuit voltage for the end user. -
ANSreduce
Amp: - ANSthe measure of electrical current
Service lines and secondary distribution lines usually carry voltage between
__________-__________ volts. - ANS120-240
When a tree contacts one electrical conductor, it may cause a __________-to-__________
fault. - ANSphase-ground fault
, The minimum approach distance for non-qualified line clearance personnel from energized
conductors 50 kV and less: - ANS10 feet
The condition that allows electricity to flow from one object to another is called: - ANSpotential
What is a Watt? - ANSa measure of electrical power
A phase-to-phase fault occurs when there is contact between: - ANStwo or more energized
conductors
If the coating on a weatherproofed conductor falls off, the conductor will often __________. -
ANSdeteriorate
Ohm's Law describes the relationship between: - ANSvoltage, current, & resistance
Formula for Ohm's Law: - ANSVolts = Amps x Resistance
(V = I x R)
Formula for power: - ANSPower = Volts x Current
(P = V x I)
A __________ is another name for a generating plant, and is the source of most power in the
U.S. The most common sources for this power are __________ __________, __________ or
__________ turbines, & __________ __________. - ANSpowerhouse;
fossil fuels, wind or water turbines, & nuclear reactors
Tree-caused physical damage to conductors, electrical equipment, and/or supporting structures
is an example of a __________ failure. - ANSmechanical
The most common type of wire used today is an aluminum wire with a steel reinforced core.
This wire is known as: - ANSACSR (Aluminum Conductor Steel-core Reinforced)
Voltage Ranges:
Extra-high transmission lines: __________-__________ volts
Transmission lines: __________-__________ volts
Subtransmission lines: __________-__________ volts
Distribution lines: __________-__________ volts - ANS345,000-765,000 volts
115,000-230,000 volts
23,000-115,000 volts
2,400-23,000 volts
The voltage between the feet of a person standing near an energized, grounded object: -
ANSstep-potential
