Grounding and bonding

The following electrical system or source does not qualify as a separately derived system: A. Autotransformer B. Battery System C. Generator D. Photovltaic System

A. Autotransformer

An EGC is required to be installed with a feeder supplying a separate building or structure. A. True B. False

A. True

If a system is not grounded only one conductor supplied bythe system is intentionally grounded. A. True B. False

B. False

The grounding electrode conductor for a communications system must be insulated, covered, or bare and is required to be ? . A. approved B. identified C. listed D. provided with green i sulation or marked with green marking tape

C. listed

A ? is a structure that stands alone or that is cut off from adjoining structrues by fire walls, with all openings therein protected by approved fire doors. A. Building B. Concrete Pad C. Footing D. Foundation

A. Building

Common types of separately derived systems installed in commercial and industrial applications or generators and transformers. A. True B. False

A. True

The phase to ground voltage of a high leg in a 240/120 volt, 3 phase, 4 wire delta connected system is ? . A. 120 V B. 208 V C. 240 V D. 480 V

B. 208 V

If a building or other structure is supplied by feeders or branch circuits, a grounding electrode system is generally required at the separate building or structure served. A. True B. False

True

A phase to ground fault in an ungrounded system accidentally grounds the system and activate ground detectors. A. True B. False

A. True

The primary protector grounding terminal or grounding electrode must be bonded to a mobile home frame or an available grounding terminal on the mobile home frame, and the minimum size required for the bonding conductors is ? AWG copper. A. 6 B. 10 C. 12 D. 14

C. 12

If polyvinyl chloride (PVC) conduit is installed for a 600-ampere feeder supplying a separate building, a ? wire-typed copper EGC is required to be i stalled with the feeder conductors. A. 1 AWG B. 1/0 AWG C. 2/0 AWG D. 3/0 AWG

A. 1 AWG

An isolated grounding receptacle and circuit is prohibited in a patient care vicinity. A. True B. False

A. True

A 400 ampere motor control center is supplied by separately derive system and the largest on grounded conductor is 600 kcmil copper. The minimum size required for the grounding electrode conductor is ? AWG copper if the grounding electrode is a metal water pipe. A. 1 B. 1/0 C. 2/0 D. 3

B. 1/0

An intersystem bonding termination device must provide the means for connection of no less than ? Intersystem bonding conductors. A. 2 B. 3 C. 4 D. 5

B. 3

Ground detectors are not required for 240 V 3 phase ungrounded delta connected systems. A. True B. False

B. False

The grounding electrode conductor installed at a separate building or structure supplied by a feeder must be sized using ? , which bases sizing on the circular mil (cm) area of the largest underground feeder conductor. A. Table 8, Chapter 9 B. Table 250.66 C. Table 250.4 D. Table 250.122

B. Table 250.66

Where 30 volt AC systems are installed outdoors as overhead conductors, they ? be grounded. A. are not required to be B. are required ro C. shall be permitted to D. shall not

B. are required to

If grounding of a separately derived system is required by the NEC it must be as specified in accordance with ? of the NEC rules. A. 250.20(B) B. 250.24 C. 250.30(A) D. 250.30(B)

C. 250.30(A)

If a generator has a 1200 amp your overcurrent device installed at the generator set a minimum size of ? AWG copper is required for the EGC's installed in a parallel set of 4 inch PVC conduit's routed from the generator to the first system overcurrent device enclosure. A. 1/0 B. 2/0 C. 3/0 D. 4/0

C. 3/0

A ? system does not have a neutral point. A. 120/240 V, single phase, 3 wire B. 480/277 V, 3 phase, 4 wire, wye connect 208/120 V, 3 phase, 4 wire, wye connect C. 480 V, 3 phase, 3 wire, delta D. 480/277 V, 3 phase, 4 wire, wye connect

C. 480 V, 3 phase, 3 wire, delta

The system bonding jumper for a separately derived system must be sized in accordance with ? . A. NEC Table 8, Chapter 9 B. Sections 250.28(D) C. Section 250.122 D. Table310.16

C. Section 250.122

Where isolated circuit conductors supply 125 V, single phase 15 and 20 amp receptacles from an isolated power panel the ?conductor is required be connected to the terminals on the receptacles that are identified in accordance with 200.10(B) for connection to the grounded circuit conductor. A. gray B. green C. striped orange D. white

C. striped orange

Isolated power systems installed in health care facilities are required to be installed and operated as ? . A. impedance grounded neutral systems B. solidy grounded systems C. ungrounded systems D. any of the above

C. ungrounded systems

Where are the common ground in electrode conductor tap concept is used for grounding multiple separately derived systems the minimum size required for the common grounding in electrode conductor is ? AWG copper. A. 1 B. 1/0 C. 3 D. 3/0

D. 3/0

What is the phase to ground voltage of the ungrounded conductors supplied by 480 V, 3 phase, 3 wire corner grounded delta system? A. 120 V B. 240 V C. 277 V D. 480 V

D. 480 V

A 400-ampere feeder supplies a separate building. If the grounding electrode installed at this separate building is a single ground rod that has less than 25 ohms resistance to ground, the maximum size for the copper grounding electrode conductor required as the sole connection is ? . A. 1/0 AWG B. 2 AWG C. 3 AWG D. 6 AWG

D. 6 AWG

If the system bonding jumper for a separately derived system is installed at the first disconnecting means enclosure it must connect the ground conductor of the system to ? . A. the disconnecting means enclosure B. the EGC or EGC's C. the supply side bonding jumper D. all of the above

D. all of the above

A common grounding electrode conductor installed for multiple separately derived systems is permitted to be which of the following? A. 3/0 copper conductor B. interconnected metal building frame C. metallic water piping system D. any of the above

D. any of the above

The grounding electrode conductor for a separately derived system must be connected to the grounded conductor where the ? is installed. A. equipment bonding jumper B. first overcurrent device C. grounding electrode D. system bonding jumper

D. system bonding jumper

The NEC specifies which electrical systems are required to be grounded, which systems are permitted to be grounded, and which systems are not permitted to be groundes. A. True B. False

True

Which of the following circuits is required to be grounded? A. 120 V lighting circuits B. Circuits for cranes over Class III locations C. Lighting systems as provideed in 411.5(A) D. Isolated power systems for health care facilities

A. 120 V lighting circuits

A building is supplied by a 100-ampere feeder installed to a panelboard located in that separate building. A grounding electrode is required for this installation. A. True B. False

A. True

A neutral conductor is defined in the NEC as the conductor connected to the neutral point of a system and that generally carries current under normal conditions. A. True B. False

A. True

The voltage readings from the Fais conductors of an ungrounded system are due to distributed leakage capacitance in the system. A. True B. False

A. True

When a building is supplied by an ungrounded system, the feeder from the ungrounded system must include an EGC or supply-side bonding jumper with the conductors to the building disconnecting means and the EGC or supply-side bonding jumper must be connected to the disconnecting means enclosure as well as to the grounding electrode conductor. A. True B. False

A. True

Where a transformer secondary is 30 volts (AC) and the primary is supplied by an ungrounded source, the secondary must be grounded. A. True B. False

A. True

Where the service equipment for a mobile home is located within sight of and no more than 30 feet from the mobile home, the primary protector grounding terminal is required to be connected to the grounding electrode for the service equipment. A. True B. False

A. True

The copper conductor required for a protection grounding electrode conductor installed for a television antenna system and equipment must not be smaller than ? AWG. A. 8 B. 10 C. 14 D. 17

B. 10

Where a non-metallic raceway is installed for the secondary of a separately derived system a supply side bonding jumper is required to be installed in size according to ? based on the largest ungrounded derive system conductor. A. NEC Table 8, Chapter 9 B. Table 250.102(C)(1) or 12.5% C. Table 250.122 D. Table 310.16

B. Table 250.102(C)(1) or 12.5%

Metal water piping and structural metal framing that exists in the areas served by separately derived system must be bonded to the grounded conductor of that separately derive system. ? is used to size this bonding jumper or conductor. A. NEC Table 8, Chapter 9 B. Table 250.66 C. Table 250.122 D. Table 310.16

B. Table 250.66

An insulated grounded conductor of a system is required to be identified by any of the following methods except ? . A. gray insulation B. green insulation C. three white or gray stripes along the entire length of the conductor D. white insulation

B. green insulation

A premises wiring system whose power is derived from a source of electric energy or equipment other than a service best describes a ? . A. hydropower facility B. seperately derived system C. utility generating station D. utility power network

B. seperately deri ed system

The minimum size required for a copper wire tight system bonding jumper is ? AWG if the size of the largest ungrounded derived phase conductor connected to the system is 750 kcmil aluminum. A. 1/0 B. 2/0 C. 3/0 D. 4/0

A. 1/0

Geounded conductors ? or larger are permitted to be identified either in the same manner as that required for conductors 6 AWG and smaller, or, at the time of installation, by a distinctive white or gray marking at the terminations. A. 4 AWG B. 12 AWG C. of aluminum and smaller D. of copper and smaller

A. 4 AWG

The equipotential plane can be built using wire mesh, reinforcing bars, and other steel rods and conductive elements. The grid is created when all of these conductive elements are bonded together by, at minimum, a(n) ? copper conductor. A. 8 AWG solid B. 10 AWG stranded C. 12 AWG solid D. 14 AWG stranded

A. 8 AWG solid

Which of the following circuits are permitted to be grounded? A. A 480 V, 3 phase, 3 wire, delta system B. Circuits for equipment within electrolytic cell working zones, as provided in Article 668 C. Isolated power systems in health care facilities covered by 517.160 D. Secondary circuits of lighting systems for pools, as covered in 680.23(A)(2)

A. A 480 V, 3 phase, 3 wire, delta system

If no grounding electrodes are present for use ar a separate building supplied by a feeder, which of the following applies? A. A grounding electrode must be installed. B. A grounding electrode is not required C. By exception, a ground ring electrode is required. D. The EGC of the feeder can serve as the only grounding means

A. A grounding elctrode must be installed.

An AC system supplying premises wiring must be grounded where the maximum voltage to ground from any ungrounded conductor does not exceed 150 volts. A. True B. False

A. True

If a communcations system grounding electrode conductor is subject to physical damage, it must be protected. If it is installed in a ferrous metal raceway, both ends of the raceway have to be bonded to the contained grounding electrode conductor. A. True B. False

A. True

If the transfer switch for a generator system switch is the grounded (neutral) conductor, the generator must be grounded as a separately derived system. A. True B. False

A. True

Section 250.32(B)(1) generally restricts any installed grounded conductor from being connected to a grounding electrode or the EGC for the separate building or structure. A. True B. False

A. True

The disconnecting means installed in the feeder supplying a separate building always must be suitable for use as service equipment. A. True B. False

A. True

The purpose of primary protectors and discharge units is to provide a level of surge protection and ground discharge of transient overvoltages and unintentional contact with higher voltage lines. A. True B. False

A. True

The redundant EGC requirements of 517.13 apply only to branch circuit serving patient care spaces, not to the feeders. A. True B. False

A. True

The size of a DC system bonding jumper must be no less than the system grounding electrode conductor based on 250.66. A. True B. False

A. True

When a single multiwire branch circuit that includes an EGC supplies a separate building or structure and no grounding electrodes are present at the building or structure served, installing a grounding electrode is not required. A. True B. False

A. True

Where an isolated power system is used, the patient equipment grounding point is typically connected to the reference grounding bar in the ? . A. isolated power panel B. operating room C. service equipment enclosure D. transformer enclosure

A. isolated power panel

If a generator without an overcurrent device supplies a building and a supply side bonding jumper is installed with 400 kcmil copper feeder conductors, the minimum size required for the supply side bonding jumper is ? AWG copper. A. 1 B. 1/0 C. 2 D. 3

B. 1/0

Where are the grounding electrode tap conductors for multiple separately derived systems are connected to a common grouning electrode conductor the minimum size required for each tap conductor is ? AWG copper if each system secondary derived under grounded conductor is sized at 300 kcmil copper. A. 1/0 B. 2 C. 3 D. 4

B. 2

Where a bonding jumper or conductor is installed for bonding a separate communications system grounding electrode to the power system grounding electrode, the minimum size required is ? AWG copper. A. 4 B. 6 C. 8 D. 10

B. 6

Separately derived systems supplied by transformers having a primary voltage rating of less than 1000 V are not required to be grounded if all but the following conditions is met: A. Continuity of control power is required B. Continuity of line power is required C. Qualified persons service this installation D. This system is used for control circuits only

B. Continuity of line power is required

A 240 V, 3 phase, 3 wire delta connected system is required to be grounded. A. True B. False

B. False

A 480 volt, 3 phase, 3 wire, delta connected system is always required to be grounded. A. True B. False

B. False

A grounding electrode is not required for a separate structurethat is supplied by only one branch circuit even if the circuit does not include an EGC. A. True B. False

B. False

A grounding electrode is required for a lighting pole in a parking lot. A. True B. False

B. False

A system bonding jumper for an outdoor transformer separately derived system is not permitted at the source enclosure and the first overcurrent device enclosure even if there are no parallel paths for current in the grounded conductor of the system. A. True B. False

B. False

Where a system can be grounded so that the maximum voltage to ground from any system ungrounded conductor does not exceed 240 volts, the system must be grounded. A. True B. False

B. False

? refers to all circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch circuit overcurrent protective device. A. Derived System Conductors B. Feeder C. Service Conductors D. Branch Circuit

B. Feeder

Which of the following conductors is not present when i stalling an ungrounded system? A. Equipment grounding conductor B. Grounded conductor C. Grounding electrode conductor D. Ungrounded conductors

B. Grounded conductor

According to the NEC, a ? Is that which is built or constructed, other than equipment. A. Footing B. Structure C. Building D. Foundation

B. Structure

A conductor installed on the supply side of a service within a service equipment enclosure or for a separately derived system that inch ensures the require electrical conductivity between metal parts required to be electrically connected best defines which component of the grounding and bonding system? A. EGC B. Equipment bonding jumper C. Supply side bonding jumper D. System bonding jumper

C. Supply side bonding jumper

The grounded conductor supplied by separately derived system must be no smaller than required by ? if there is no neutral load on the system. A. Table 250.2 B. Table 250.66 C. Table 250.102(C)(1) D. Table 250.122

C. Table 250.102(C)(1)

A(n) ? is an area where wire mesh or other conductive elements are embedded in or placed under concrete, bonded to wall metal structures and fixed nonelectrical equipment that may become energized and connected to the electrical grounding system to prevent a difference in voltage from developing within the plane. A. common grounding electrode B. equipotential bonding grid C. equipotential plane D. signal reference grid

C. equipotential plane

If there is no disconnecting means or overcurrent device at the load end of the conductors supplied by separately derived system the system bonding jumper must be installed ? . A. in the first overcurrent device enclosure B. in the service equipment enclosure C. In the source enclosure D. outside of the source enclosure on the load side of the system

C. in the source enclosure

If a generator for standby power supplies a separate building, a separate disconnecting means where the feeder arrives at the build- ing or structure is not required if ? . A. The disconnecting means is located within sight from the building it serves. B. The disconnecting means is suitable for use as service equipment. C. The generator disconnect is readily accessible. D. All of the Above

D. All of the Above

If present, which of the following grounding electrodes must be used to form a grounding electrode system for a building or structure served by a feeder or branch circuit? A. Ground Rods B. Structural Metal Building Frame Electrode C. Underground Metal Water Pipe D. All of the Above

D. All of the Above

Metal water piping systems in separate buildings or structures are required to be bonded to which of the following locations? A. One or more of the grounding electrodes used at the seperate building or structure. B. The building or structure disconnecting means. C. The EGC run with the feeder conductors to the building D. All of the Above

D. All of the Above

The grounded (usually the neutral) conductor of feeders or branch circuits is permitted to be used for grounding at separate buildings or structures only in existing premises wiring systems and in accordance with which of the following conditions? A. An EGC is not included with the supply circuit to the separate building or structure B. Ground-fault protection of equipment is not provided at the service location on the supply side of the feeder. C. There are no common electrically continuous metallic paths between the feeder source and the destination at the building or structure served. D. All ot the Above

D. All of the Above.

A separately derived system must be grounded by connection to which of the following. A. the meral enclosure of the system B. metal water piping system in the area served C. metal gas piping D. building or structure grounding electrode system

D. building or structure grounding electrode system

The ? is a device that provides a means for connecting bonding conductors for communications systems to the grounding electrode system. A. grounding electrode B. grounding electrode conductor C. grounding electrode system D. intersystem bonding termination

D. intersystem bonding termination