250

grounding electrode

a separate bonding jumper to the building structural metal shall not be required if the metal frame of a building or structure is used as the _____ for the separately derived system.

(Any), being there, continuous outer finish that is green, continuous outer finish that is green with one or more yellow stripes.

an equipment grounding conductor shall be identified by...

electrical continuity

bonding shall be provided where necessary to ensure _____ and the capacity to conduct safely any fault current likely to be imposed.

250.66

each tap conductor to a common grounding electrode conductor for multiple separately derived system shall be sized in accordance with _____, based on the derived ungrounded conductors of the separately derived system it serves.

(Any), corrosion, moisture, physical damage

rebar type concrete encased electrode installed in accordance with 250.52 a 3 with an additional rebar section extended from its location within the concrete to an accessible location that is not subject to _____ shall be permitted for connection of grounding electrode conductors and bonding jumpers.

cable assemblies

short sections of metal enclosures or raceways used to provide support or protection of _____ from physical damage shall not be required to be connected to the equipment grounding conductor.

raceways or service cable armor, cable trays, equipment enclosures containing service conductors including meter, or the like.

the normally non-current carrying metal parts of service equipment, such as service _____, shall be bonded together.

insulated

the receptacle grounding terminal of an isolated ground receptacle shall be connected to a _____ equipment grounding conductor run with the circuit conductors.

ungrounded Supply conductor size

the supply-side bonding jumper on the supply side of services shall be sized according to the...

18 in

were used outside, aluminum or copper clad aluminum grounding electrode conductors shall not be terminated within _____ inches of the Earth.

accessible

bonding jumper used to bond the metal shall be installed in accordance with 250.64 A, 250.64 B and 250.64 E and the points of attachment of the bonding jumper shall be _____.

reducing washers, oversized eccentric Knockouts, oversized concentric knockouts.

bonding jumpers for service raceways shall be used around impaired connections such as...

1/4 inch thick by 2 in wide

bonding jumpers from grounding electrodes shall be permitted to be connected to an aluminum or copper busbar not less than _____ and of sufficient length to accommodate the number of terminations necessary for the installation in accordance with 250.64 f.

250.122

electrical equipment permanently mounted on skids, and the skids themselves, shall be connected to the equipment grounding conductor size as required by...

branch circuit short-circuit and ground-fault protective

equipment grounding conductors for motor branch circuit shall be sized in accordance with table 250.122, based on the rating of the _____ device.

(Any), an electrical contact with metal, and wet or damp, within 8 feet vertically or 5 feet horizontally ground or grounded material.

exposed normally non-current carrying metal parts of fixed equipment likely to become energized shall be connected to the equipment grounding conductor where located...

(Any), service equipment enclosures or building disconnecting means, grounded conductor to service, grounding electrode where of sufficient size.

exposed structural metal interconnected to form a metal building frame that is not intentionally grounded or bonded and is likely to become energized, shall be bonded to the...

(Any), low impedance circuit, circuit facilitating the operation of the overcurrent device, circuit capable of safely carrying the ground fault current likely to be imposed on it.

for Grounded systems, electrical equipment and other electrically conductive material likely to become energized shall be installed in a manner that creates a _____ from any point on the wiring system where a ground fault may occurred to the electrical supply source.

(All), afci protected, grounded and bonded, isolated

for a separate building or structure supplied by a separately derived system when overcurrent protection is not provided for the supply conductors to the building / structure as permitted by 240.21 C4, the installation shall be blank in accordance with 250.30 A.

the Earth

grounding electrode conductors and grounding electrode bonding Jumpers in contact with _____ shall not be required to comply with 300.5, but I'll be buried or otherwise protected if subject to physical damage.

10 feet

one or more metal in ground support structures in direct contact with the Earth vertically for _____ feet or more, with or without concrete encasement is permitted to be a grounding electrode in accordance with 250.52.

grounded AND bonded

separate bonding jumper from each derived system to metal water piping and to structural metal members shall not be required if the metal water piping and the structural metal members in the areas served by the separately derived system are _____ to the common grounding electrode conductor.

bonded

service raceways threaded into metal service equipment such as bosses, hubs, are considered to be effectively _____ to the service metal enclosure.

grounding electrode

the frame of a portable generator shall not be required to be connected to a _____ if the generator only supplies equipment mounted on the generator, cord and plug connected equipment using receptacles mounted on the generator, or both.

flush with OR below

the upper end of a ground rod electrode shall be _____ ground level unless the above ground end and the grounding electrode conductor attachment are protected against physical damage.

false

true or false, if exposed structural metal that is interconnected to form the building frame exists in the area served by the separately derived system, it shall be bonded to the grounded conductor of each separately derived system at each bonding jumper shall be sized in accordance with table 250.102 c 1 based on the largest ungrounded conductor for the service?

true

true or false, metal enclosures and raceways containing service conductors shall be connected to the grounded system conductor if the electrical system is grounded?

true

true or false, the armor of type AC cable is recognized by the NEC as an equipment grounding conductor?

true

true or false, the equipment grounding conductors for feeder Taps are not required to be larger than the tap conductors?

true

true or false, the grounded conductor of each separately derived system shall be bonded to the nearest available point of the metal water piping system in the area served by each separately derived system and each bonding jumper shall be sized in accordance with table 250.102 c 1 based on the largest ungrounded conductor of the separately derived system?

true

true or false, two or more grounding electrodes bonded together are considered a single grounding electrode system?

both ground detectors installed and the ground detection sensing equipment connected as close as practicable simple to where the system receives its Supply

ungrounded alternating current systems from 50v to 1000v or less that are not required to be grounded in accordance with 250.20 B shall have...

30 in

where Rock Bottom is encountered when driving a ground rod at an angle of up to 45 degrees, the electrode can be buried in a trench that is at least _____ deep.

green finish

where a main bonding jumper is a screw only, the screw shall be identified with a _____ that shall be visible with the screw installed.

below permanent moisture level

where practicable, Rod, pipe, and played electrodes shall be installed...

3

Communication System bonding termination connections to an aluminum or copper busbar shall not be less than 1/4 inch thick by 2 inches wide and of sufficient length to accommodate at least _____ terminations for communications systems in addition to other connections.

equipment grounding conductor

auxiliary grounding electrodes can be connected to the...

green / green with one or more yellow stripes

conductors with the color _____ insulation shall not be used for ungrounded or grounded conductors.

terminal bars, listed pressure connectors, or exothermic welding.

equipment grounding conductors, grounding electrode conductors, and bonding jumpers shall be connected by...

electrical supply source

for Grounded systems, electrical equipment and electrically conductive material likely to become energized, she'll be installed in a manner that creates a low-impedance circuit capable of safely carrying the maximum ground fault current likely to be imposed on it from where a ground fault may occur to the...

metal and wood

ground clamps and fittings that are exposed to physical damage shall be enclosed in _____ or equivalent protective covering.

solder

grounding and bonding connection devices that depend solely on _____ shall not be used.

6

grounding electrode conductor smaller than _____ AWG shall be protected in rigid metal conduit, IMC, PVC conduit, electrical metallic tubing, or cable armor.

solid, stranded, insulated or bare.

grounding electrode conductors of the wire type shall be...

1 1/4

listed FMC can be used as the equipment grounding conductor if the equipment does not exceed trade size...

20 amps

listed FMC can be used as the equipment grounding conductor if the length in any ground return path does not exceed 6 feet and the circuit conductors contained in the conduit are protected by overcurrent devices rated at _____ or less.

made up tight

service metal raceways and metal clad cables are considered effectively bonded when using threadless couplings and connectors that are...

either 3/0 AWG copper or 250 kcmil aluminum

the common grounding electrode conductor installed for multiple separately derived system shall be permitted to be the metal structural frame of the building or structure that complies with 250.68C to or is connected to the grounding electrode system by a conductor not smaller than...

(Any), listed lugs, exothermic welding, listed pressure connectors.

the grounding conductor connection to the grounding electrode shall be made by...

true

true or false, a grounded circuit conductor is permitted to ground non-current carrying metal parts of equipment, raceways, and other enclosures on the supply side or within the enclosure of the AC service disconnecting means?

true

true or false, a grounding electrode conductor shall be permitted to be run to any convenient grounding electrode available to the grounding electrode system where the other electrodes, if any, is connected by bonding jumpers that are installed in accordance with 250.53 C?

grounded

where an alternating current system operating at 1000v or less is grounded at any point, the _____ conductors shall be routed with the ungrounded conductors to each service disconnecting means and shall be connected to each disconnecting means grounded conductors terminal or bus.

commercial, industrial, institutional.

where conditions of Maintenance and supervision ensure only qualified persons service the installation in _____ buildings, the entire length of the metal water piping system can be used for grounding purposes, provided the entire length, other than short sections passing through walls, floors, or ceilings, is exposed.

(Any), permitted to discontinue one or more of grounding connections, change the location of the grounding connection, and traps the continuity of the conductor causing objectionable current.

if the use of multiple grounding connections results in objectionable current and the requirements for 250 Point for A5 or B4 are met, it shall be permitted to...

true

true or false, for Grounded systems, normally non-current carrying conductive materials enclosing electrical conductors or equipment shall be connected to Earth so as to limit voltage to ground on these materials?

false

true or false, the structural metal frame of a building can be used as the required equipment grounding conductor for AC equipment?

true

true or false, where more than one concrete encased electrode is present at a building or structure, it shall be permitted to connect to only one of them?

ungrounded Supply conductors

where ungrounded Supply conductors are paralleled in two or more raceways or cables, the bonding jumper for each Raceway or cable shall be based on the size of the _____ in each Raceway or cable.

(A or B) installed in a run of nonmetallic Raceway and isolated from possible contact play a cover of 18in, or part of an installation of non-metallic raceways and are isolated from possible contact not less than 2 in of concrete.

metal components shall not be required to be connected to the equipment grounding conductor or supply-side bonding jumper where the metal components are...

(Any), multiple individual grounding electrodes, 1 grounding electrode at common location, a common grounding electrode conductor and Taps.

where service equipment consists of more than one enclosure, grounding electrode conductor connections shall be permitted to be...

1

where the box is mounted on the surface, direct metal-to-metal contact between the service yolk and the Box shall be permitted to ground the receptacle to the box if at least _____ of the insulating Washers of the receptacle is / are removed.

grounding electrode

where the main bonding jumper is installed from the grounded conductor terminal bar to the equipment grounding terminal bar in service equipment, the _____ conductor is permitted to be connected to the equipment grounding terminal bar.

the single Rod electrode shall be supplemented by one additional electrode

where the resistance to ground of 25 ohms or less is not achieved for a single Rod electrode...

grounded

it shall be permissible to ground meter enclosures immediately adjacent to the service disconnecting means to the blank circuit conductor on the load side of the service disconnect, if Service ground fault protection is not provided.

true

true or false, a wire type equipment grounding conductor is permitted to be used as a grounding electrode conductor if it meets all of the requirements of Parts 2, 3, and 4 of article 250?

true

true or false, alternating current circuits of less than 50 V shall be grounded if supplied by a Transformer whose Supply system exceeds 150 volts to ground?

true

true or false, alternating current systems of 50v or 1000v that Supply premises wiring systems she'll be grounded where the system is three-phase, four wire, Wye connected, with a neutral conductor used as a circuit conductor?

listed

where installed to reduce electrical noise for electronic equipment on the grounding circuit, a metal Raceway can terminate to a _____ nonmetallic fitting or spacer on the electronic equipment. The metal Raceway shall be supplemented by an internal insulated equipment grounding conductor.

structural steel and metal piping

in an area served by a separately derived system, the _____ shall be connected to the grounded conductor of the separately derived system.

equipment bonding jumper

an _____ shall be used to connect the grounding terminal of a grounding type receptacle to a grounded box.

true

true or false, an important consideration for limiting and post voltage on electrical systems is to remember that bonding and grounding electrode conductors should not be any longer than necessary and unnecessary bends and loops should be avoided.

false

true or false, currents that introduce noise or data errors in electronic equipment are considered objectionable currents in the context of 250.60 of the NEC.

true

true or false, equipment grounding conductors of the wire type so I'm not be required to be larger than the circuit conductors?

true

true or false, a grounding electrode conductor, sized in accordance with 250.66, shall be used to connect the equipment grounding conductors, the service equipment enclosures, and, where the system is grounded, the grounded service conductor to the grounding electrodes?

electrically

ferrous metal raceways and enclosures for grounding electrode conductors shall be bonded at each end of the Raceway or enclosure to the grounding electrode or grounding electrode conductor to create a_____ parallel path.