2-4-15
A(n) ? circuit type of line fault will seldom generate enough fault current to operate overcurrent protective devices.
open
When working on a deenergized single-phase line that is fed by an OCR, remove the ? of the OCR from the line.
primary leads
An underground system should be inspected, depending on size, ? .
at least annually
During a ? , it is possible for one OCR to be feeding one or two other phases while the other phase OCRs are open.
cross-circuit
A poor OCR maintenance program will ? it takes for the OCR to reset.
extend the time
An OCR that has gone through its trips and locked out can energize the line if it is held closed by pushing on the handle and holding it closed with a hot stick.
false
If the overhead circuit one is working on is fed from a fused disconnect, leave the door in place to make it easier to energize the circuit when repairs are complete.
false
Secondary service runs to be tested must be energized at 120 volts per phase in order to run a proper test.
false
The "thump" that can be heard when testing cable with a thumper is a ? discharge.
high energy
? may escape detection when using a thumper on underground primary cable.
high resistance moisture faults
Prior to testing a primary cable, it must be ? .
isolated
When using a tone generator to locate a fault on underground secondary, the deflections will ? when the probes move past the area of the fault.
reverse direction
One should never energize a line with a(n) ? .
sectionalizer
One way to pinpoint the location of a fault on an underground primary cable when using a radar unit is to ? .
take readings from both ends of cable
The ? is a capacitor discharge unit that can cause cable damage if the voltage setting is higher than the dielectric capacity of the cable insulation.
thumper
If a thumper is mounted on a van or trailer, ? can be prevented if the van or trailer is properly grounded or barricaded.
touch potential
A fault on a primary cable will show up as a particular blip on a radarscope.
true
A phase that is lying on the ground may not draw enough amperage to operate the protective equipment.
true
A tree on the line may or may not ground a line and cause the protective equipment to work.
true
If an underground system is equipped with fault indicators, a fault on a primary cable will be between the last indicator that shows a target and the one that does not.
true
If unable to interpret the readings of a radar unit, a Y splice in an underground primary cable may have the worker digging in the wrong spot when looking for a fault.
true
Unless the manufacturer of the testing equipment states otherwise, lightning arresters should be taken off the underground primary cable under test.
true
Two pieces of equipment that may be used when checking an energized underground secondary service include a super beast and a ? .
voltmeter
The first thing one should do after isolating a run of cable that has faulted is to ? .
walk the cable route
