3-2-7

Under circumstances where it is impractical to install a complete grounding set at the worksite, an alternate method is to place a 3-phase grounding set on either side of the worksite, similar to bracket grounding. At the work site, the worker ? . a.is adequately protected with no additional equipment b.must wear voltage rated gloves c.must work from an insulated platform d.needs to use a cluster bar and personal jumper to create an equipotential zone

d.needs to use a cluster bar and personal jumper to create an equipotential zone

When it is necessary to parallel grounding cables for greater fault current capacity, the cable ratings must be reduced by ? if unrestrained. a.10% b.15% c.20% d.25%

C. 20%

The cleaning effect produced by wire brushing line conductors is nearly gone in ? . a.20 minutes b.60 minutes c.8 hours d.24 hours

A. 20 minutes

Single-point master grounds are located 200 feet from a worker. The worker has installed a cluster bar below his feet and a personal jumper is connected to the neutral. The equipotential zone allows the worker to contact any conductor on the structure. If the distance is between the worker and the ground is ? or more, an additional jumper from the cluster bar to the phase being worked must be added. a.300' b.400' c.500' d.600'

A. 300'

Federal law regarding the testing of lines for the absence of nominal voltage before temporary grounds are installed is found in OSHA 29 CFR ? . a.1910.104 b.1910.269 c.1926.104 d.1926.417

B. 1910.269

A specific approximation of the voltage on the line can be found by using the ? for testing. a.hot-horn b.MRVD c.neon indicator d.NTVD

B. MRVD

If work is to be performed on H-structure type transmission lines and rocky soil makes the ground resistance suspect, the ? may be used as a fault current return path. a.buried pole-to-pole ground wires b.grounded structure hardware c.overhead ground wires d.screw-in type temporary ground rods

C. Overhead ground wires

When grounding a 4-wire distribution circuit, the most effective ground electrode is a(n) ? . a.anchor rod b.pole ground wire c.system neutral d.temporary ground rod

C. System neutral

The presence of voltage can be indicated without making contact with the line when using the ? . a.fuzzing method b.MRVT c.neon indicator d.NTVD

D. NTVD

A complete grounding set with a cluster bracket and personal jumper is installed at the worksite. This method is referred to as ? grounding. a.all-phase b.cross-phase c.job-site d.single-point

D. Single-point

The voltage on insulated overhead shield wires is held to nearly earth potential at ? . a.every tower attachment b.insulated dead ends c.no point on the line d.the midsection ground point

D. The midsection ground point

An acceptable work practice is to hold a ground cable near the base of a hot stick to lighten the load on the head of the stick. Select one: True False

False

In a situation where a single phase of a 3-phase line is grounded, the minimum approach distance to the ungrounded deenergized phases is reduced. Select one: True False

False

When armor rod is present on line conductors, it is better to attach the grounding clamps to the armor rod than to the conductors. Select one: True False

False

A grounding set bonding the phases, the neutral, and earth will ensure fast trip-out operation of circuit protection devices. If only one phase is energized, the grounding jumper connecting the phases to neutral and earth will create a ground fault that will initiate the operation of overcurrent protective equipment. Select one: True False

True

Before work begins on a line that has been deenergized and disconnected from all power sources, a clearance must be obtained. Select one: True False

True

When removing grounding assemblies, it is recommended to remove them in the reverse order of installation. Select one: True False

True

When excessively long grounding cables are installed, ? . a.higher cable resistance results b.overcurrent protection equipment operation is faster c.the whipping action caused by fault currents is self-dampened d.the worker should coil and tape the extra length

a.higher cable resistance results

The installation of a complete grounding set bonding the phases, the neutral, and earth together ? . a.eliminates earth voltage rise at the worksite b.eliminates the need for a cluster bar and personal jumper c.ensures fast trip-out operation of circuit protection devices d.reduces step potential hazards

c.ensures fast trip-out operation of circuit protection devices

The ground-end clamp of a jumper is always ? . a.attached to a temporary ground rod b.connected after the phase wire end is attached c.connected with voltage rated rubber gloves d.the first connection made and the last removed

d.the first connection made and the last removed