Lesson 18 - Equipment Grounding & Bonding

All metal raceways and other non-current-carrying metal parts of electric equipment shall be bonded to the lightning rod conductor. Select one: True False

False

Where multiple equipment grounding conductors are present in a metal outlet box, their continuity shall not rely on connections to fixtures, receptacles, or wiring devices. Select one: True False

True

A ___ copper bonding jumper is required for each of three metal service raceways with 600 kcmil copper phase conductors. Select one: a.1/0 b.2/0 c.225 kcmil d.500 kcmil

a.1/0

If made of copper, a ___ equipment grounding conductor is required in a nonmetallic raceway that has a 12 AWG copper circuit protected by a 20-ampere breaker, a 10 AWG copper circuit protected by a 30-ampere breaker, and an 8 AWG copper circuit protected by a 40-ampere breaker. Select one: a.10 AWG b.6 AWG c.8 AWG d.12 AWG

a.10 AWG

Equipment grounding conductors larger than ___ are not required to have a green insulation or covering if reidentified at both ends and at all accessible points at the time of installation. Select one: a.6 AWG b.8 AWG c.4 AWG d.1 AWG

a.6 AWG

A method used to assure electrical continuity around concentric or eccentric knockouts for metal boxes, with circuits over 250V would be _____. Select one: a.Bonding jumpers b.Double locknuts on threaded conduit (one inside and one outside the box or enclosure) c.Listed connectors d.All the above

a.Bonding jumpers

Bonding shall be provided where necessary to ___. Select one: a.assure electrical continuity and the capacity to conduct safely any fault current likely to be imposed b.provide an equipment grounding means for all nonservice-related general use equipment c.please the authority having jurisdiction d.all of the above

a.assure electrical continuity and the capacity to conduct safely any fault current likely to be imposed

A ___ is a conductor used to assure the electrical conductivity between metal parts required to be electrically connected. Select one: a.bonding jumper b.ground c.main bonding jumper

a.bonding jumper

For a grounded system, an unspliced main bonding jumper shall be used to connect the __ to the grounded circuit conductor of the system at each service disconnect. Select one: a.equipment grounding conductors b.grounding electrode c.service raceway d.motor service protector

a.equipment grounding conductors

The grounding electrode conductor at the service ___ permitted to terminate on an equipment grounding terminal bar where a main bonding jumper is installed. Select one: a.is b.is not

a.is

An equipment grounding conductor generally ___. Select one: a.is required to be installed in the raceway or cable with the circuit conductors b.is permitted to be run in a separate raceway or cable c.shall be insulated d.All of the above.

a.is required to be installed in the raceway or cable with the circuit conductors

Half-inch flexible metal conduit is permitted for grounding if the total length in any grounding path for the circuit is not over 6 feet and the circuit conductors are protected by an overcurrent device of not over ___ amperes. Select one: a.15 b.20 c.30 d.60

b.20

The main bonding jumper shall be sized according to ___. Select one: a.Table 250.122 b.Table 250.102(C 1) c.the ampere rating of the service disconnecting means d.the maximum load on any ungrounded conductor

b.Table 250.102(C 1)

Auxiliary grounding electrodes ___ permitted to be used as the sole grounding means for equipment. Select one: a.are b.are not

b.are not

Equipment bonding jumpers ___ required for receptacles that have direct metal contact between the metal yoke of the receptacle and a surface mounted metal box. Select one: a.are b.are not

b.are not

Isolated short sections of metal raceway used for protection of cables ___ required to be grounded. Select one: a.are b.are not

b.are not

Raceways threaded into metal service equipment are considered to be ___ to the service metal enclosure. Select one: a.permanently attached b.bonded c.grounded d. unbonded

b.bonded

A[n] ___ shall be used to connect the grounding terminal of a grounding-type receptacle to a grounded box. Select one: a.12 AWG conductor b.equipment bonding jumper c.14 AWG conductor d.equipment grounding jumper

b.equipment bonding jumper

A ___ is used to connect equipment to the grounding electrode. Select one: a.grounded conductor b.grounding electrode conductor c.bonding jumper

b.grounding electrode conductor

The structural metal frame of a building ___ permitted to be used as the equipment grounding conductor for air-conditioning equipment. Select one: a.is b.is not

b.is not

The earth ___ be used as the sole equipment grounding conductor for equipment. Select one: a.may b.must not

b.must not

Bonding jumpers are required around knockout rings for metal raceways containing circuits over ___ volts to ground except where the knockouts have been tested and the box or enclosure listed for the use. Select one: a.240 b.277 c.250 d.480

c.250

A ___ copper equipment grounding conductor is required for a 20-hp, 230-volt, 3-phase motor that has a full-load current of 54 amperes with overload protection of 115% of the nameplate current and branch-circuit protection provided by a time-delay circuit breaker of 150 amperes. Select one: a.1 AWG b.2 AWG c.6 AWG d.4 AWG

c.6 AWG

_______ is the permanent joining of metallic parts to form an electrically conductive path that will assure electrical continuity. Select one: a.Grounding b.Connecting c.Bonding d.Jumpering

c.Bonding

Where a single equipment grounding conductor is used for multiple branch circuits in the same raceway, the equipment grounding conductor shall be sized according to: _____. Select one: a.Table 250.66, based on the size of the largest grounded (neutral) conductor b.Table 250.66, based on the size of the largest phase conductor c.Table 250.122, based on the ampere rating of the highest-rated overcurrent device for any conductor d.Table 250.122, based on the sum of the two highest-rated overcurrent devices

c.Table 250.122, based on the ampere rating of the highest-rated overcurrent device for any conductor

Conductive enclosures for conductors or equipment are grounded and bonded to ___. Select one: a.limit voltage to ground b.facilitate operation of overcurrent devices c.both (a) and (b) d.None of the above.

c.both (a) and (b)

Concrete floors in agricultural confinement buildings shall have a[n] ___ bonded to the electrical system. Select one: a.bonding jumper b.main bonding jumper c.equipotential plane d.grounding grid

c.equipotential plane

The main bonding jumper in a service disconnect is permitted to be a ___. Select one: a.screw b.wire c.bus d. Any of the above.

d. Any of the above.

Bonding jumpers shall be used at service equipment around ___ that are punched or otherwise formed so as to impair the electrical connection to ground. Select one: a.concentric knockouts b.threaded hubs c.eccentric knockouts d.(a) and (c)

d.(a) and (c)

The main bonding jumper shall be not smaller than ___ for a 200-ampere residential service consisting of 2/0 THW copper conductors in rigid metal conduit. Select one: a.6 aluminum b.6 copper c.4 aluminum d.4 copper

d.4 copper

An equipment bonding jumper not more than ___ inches long is permitted to be secured to the outside of a raceway or enclosure for the associated circuit conductors. Select one: a.12 inches b.24 inches c.36 inches d.72 inches

d.72 inches

Exposed non-current-carrying metal parts likely to become energized shall be grounded when ___. Select one: a.within 8 feet vertically or 5 feet horizontally of ground or grounded objects b.when the equipment is in electrical contact with metal c.in wet or damp locations d.All of the above.

d.All of the above.

The non-current-carrying metal parts of equipment such as ___ shall be effectively bonded together. Select one: a.the service raceways, cable trays, or service cable armor b.all equipment enclosures containing service conductors, including meter fittings, boxes, or the like, interposed in the service raceway or armor c.any metallic raceway or armor enclosing a grounding electrode conductor d.All of the above.

d.All of the above.

The path to ground from circuits, equipment, and metal conductor enclosures shall ___. Select one: a.be permanent and continuous b.have capacity to conduct safely any fault current likely to be imposed on it c.have sufficiently low impedance to limit the voltage to ground and facilitate the operation of the circuit protective devices d.All of the above.

d.All of the above.

Equipment grounding conductors generally shall be identified by ___. Select one: a.a continuous green color b.being bare c.a continuous green color with yellow stripes d.Any of the above.

d.Any of the above.

_______ is connecting to ground (the earth) or to a conducting body that extends the ground connection. Select one: a.Isolating b.Jumpering c.Bonding d.Grounding

d.Grounding

Equipment grounding conductors for feeder circuits run in parallel, in separate raceways shall be sized according to _____. Select one: a.Table 250.66, based on the combined area of the ungrounded conductors b.Table 250.66, based on the area of the ungrounded conductors in a single raceway c.Table 250.122, based on the rating of the overcurrent device protecting the feeder, divided by the number of parallel raceways d.Table 250.122, based on the rating of the overcurrent device protecting the feeder

d.Table 250.122, based on the rating of the overcurrent device protecting the feeder

_______ in a building shall be bonded to the service equipment enclosure, the grounded conductor at the service, the grounding electrode conductor, or the grounding electrodes. Select one: a.Metal water piping b.Exposed structural steel c.Metal piping other than water piping d.Water piping, other piping, and exposed structural steel

d.Water piping, other piping, and exposed structural steel

The interior metal water pipe bonding attachment shall be ___. Select one: a.readily accessible b.sealed c.buried d.accessible

d.accessible

The ___ conductor is permitted to ground meter enclosures on the load side of the service. Select one: a.disconnect b.ungrounded c.bonding d.grounded circuit

d.grounded circuit