CUSP - T&D Exam Questions with
Verified Solutions
As per CAN/ULC S801, on an electrical distribution overhead utility line circuit,
verification of voltage absence can be achieved by: - ANS-Using an approved voltage
detector.
Isolation and tagging (no locks) is acceptable on an overhead distribution circuit under
some of the following conditions, EXCEPT for: - ANS-The isolation can be operated
from the ground directly at the base of a structure.
Isolation and tagging (no locks) is acceptable for an overhead distribution circuit under
some of the following conditions: - ANS-1. The isolation point is a physical and visual
like a line cut or riser removed.
2. The isolation point can only be operated by the operating authority or qualified
worker.
3. The isolation point is protected from unauthorized access such as vertical height
spacing.
Consider that a circuit has been isolated, tagged and grounded. workers returning the
next day must: - ANS-Visually check grounds to verify they are in good order, secure
and test for voltage.
For lockout purposes, energy isolating devices shall be labelled or marked using a
standardized nomenclature and format to indicate their function. Identification shall
include: - ANS-The equipment type, energy type, and magnitude.
Utilities often use a permitting system due to special circumstances of which
conventional lockout is impracticable. The following is NOT a justified approach to this
process: - ANS-The isolation points are only simple single step actions.
A high voltage utility or electrical company is authorized to use Complex Lockout (tag
permitting) under what regulatory condition: - ANS-A variance application has been
approved by the provincial authority.
Utilities often use a permitting system due to special circumstances of which
conventional lockout is impracticable. The following are justified approaches to this
process: - ANS-1. The isolation points are located in remote areas with difficult or
restricted access.
2. The length of time to perform the lockout is impracticable.
3. Excessive numbers of persons required to lockout.
, Work on a distribution line must consider the following items when performing isolation
and de-energizing of the circuit.: - ANS-1. Whether there are multiple sources of energy
(loop feed) on the circuit.
2. Is the line isolating device capable of interrupting load.
3. Is the line to be subject to inductive or capacitive charge.
According to the CAN/ULC S801, what is the LEAST DESIRABLE type of fall protection:
- ANS-Fall Arrest System (FAS)
Within Z259.14 standards fall restriction equipment (FRE) may only be leather in
subcomponents or elements that are NOT exposed to: - ANS-A dynamic load.
As per Z259 standards, energy absorbing lanyards shall be classified according to their
ability to absorb the kinetic energy from a fall as follows: - ANS-Class E4 (4.0 kN) and
Class E6 (6.0 kN) energy absorbing lanyards.
Assuming that the fall protection system is correctly being used, in what scenario might
the worker still contact the ground if they fell: - ANS-Working 16 feet up in a bucket truck
on distribution secondary services using a six foot shock absorbing lanyard, connected
to the approved bucket anchor.
What is NOT defined as a requirement of temporary vertical life lines as per Z259
standards: - ANS-100% polypropylene fibers provide the greatest breaking strength.
Requirements of temporary vertical life lines, as per Z259 standards: - ANS-1. Shall be
made from synthetic fibers with breaking strength of 27 kN or greater.
2. They shall be free of splices and knots, except at the terminations.
3. They shall be installed to protect against abrasion and sharp edges.
A transmission crew is sent to replace insulators on a spread leg lattice steel tower.
There are three 345 kV lines in the corridor. The line is switched out and three men
ascend the tower to ground the phases to the tower steel. After assisting with materials
assembly a 4th lineman walks to the tower preparing to climb to the work area. Still on
the ground; he touches the tower with his hand and receives a severe shock. What is
the most likely reason? - ANS-Grounding of the phases to the tower electrically coupled
induction from the phases onto the tower increasing step and touch potential between
the tower steel and earth where the lineman was standing.
What condition has the greatest effect on induced currents? - ANS-Circuit load on a
nearby phase.
Equipotential mats and barricades are protective measures that might be used: - ANS-
When a truck is grounded to a system neutral.
Verified Solutions
As per CAN/ULC S801, on an electrical distribution overhead utility line circuit,
verification of voltage absence can be achieved by: - ANS-Using an approved voltage
detector.
Isolation and tagging (no locks) is acceptable on an overhead distribution circuit under
some of the following conditions, EXCEPT for: - ANS-The isolation can be operated
from the ground directly at the base of a structure.
Isolation and tagging (no locks) is acceptable for an overhead distribution circuit under
some of the following conditions: - ANS-1. The isolation point is a physical and visual
like a line cut or riser removed.
2. The isolation point can only be operated by the operating authority or qualified
worker.
3. The isolation point is protected from unauthorized access such as vertical height
spacing.
Consider that a circuit has been isolated, tagged and grounded. workers returning the
next day must: - ANS-Visually check grounds to verify they are in good order, secure
and test for voltage.
For lockout purposes, energy isolating devices shall be labelled or marked using a
standardized nomenclature and format to indicate their function. Identification shall
include: - ANS-The equipment type, energy type, and magnitude.
Utilities often use a permitting system due to special circumstances of which
conventional lockout is impracticable. The following is NOT a justified approach to this
process: - ANS-The isolation points are only simple single step actions.
A high voltage utility or electrical company is authorized to use Complex Lockout (tag
permitting) under what regulatory condition: - ANS-A variance application has been
approved by the provincial authority.
Utilities often use a permitting system due to special circumstances of which
conventional lockout is impracticable. The following are justified approaches to this
process: - ANS-1. The isolation points are located in remote areas with difficult or
restricted access.
2. The length of time to perform the lockout is impracticable.
3. Excessive numbers of persons required to lockout.
, Work on a distribution line must consider the following items when performing isolation
and de-energizing of the circuit.: - ANS-1. Whether there are multiple sources of energy
(loop feed) on the circuit.
2. Is the line isolating device capable of interrupting load.
3. Is the line to be subject to inductive or capacitive charge.
According to the CAN/ULC S801, what is the LEAST DESIRABLE type of fall protection:
- ANS-Fall Arrest System (FAS)
Within Z259.14 standards fall restriction equipment (FRE) may only be leather in
subcomponents or elements that are NOT exposed to: - ANS-A dynamic load.
As per Z259 standards, energy absorbing lanyards shall be classified according to their
ability to absorb the kinetic energy from a fall as follows: - ANS-Class E4 (4.0 kN) and
Class E6 (6.0 kN) energy absorbing lanyards.
Assuming that the fall protection system is correctly being used, in what scenario might
the worker still contact the ground if they fell: - ANS-Working 16 feet up in a bucket truck
on distribution secondary services using a six foot shock absorbing lanyard, connected
to the approved bucket anchor.
What is NOT defined as a requirement of temporary vertical life lines as per Z259
standards: - ANS-100% polypropylene fibers provide the greatest breaking strength.
Requirements of temporary vertical life lines, as per Z259 standards: - ANS-1. Shall be
made from synthetic fibers with breaking strength of 27 kN or greater.
2. They shall be free of splices and knots, except at the terminations.
3. They shall be installed to protect against abrasion and sharp edges.
A transmission crew is sent to replace insulators on a spread leg lattice steel tower.
There are three 345 kV lines in the corridor. The line is switched out and three men
ascend the tower to ground the phases to the tower steel. After assisting with materials
assembly a 4th lineman walks to the tower preparing to climb to the work area. Still on
the ground; he touches the tower with his hand and receives a severe shock. What is
the most likely reason? - ANS-Grounding of the phases to the tower electrically coupled
induction from the phases onto the tower increasing step and touch potential between
the tower steel and earth where the lineman was standing.
What condition has the greatest effect on induced currents? - ANS-Circuit load on a
nearby phase.
Equipotential mats and barricades are protective measures that might be used: - ANS-
When a truck is grounded to a system neutral.
