Grounding and bonding
Part 3
(17) Grounding electrodes and grounding electrode systems for systems over 1,000V are covered in which part of Art. 250?
250. SU
(59)Where an auxiliary grounding electrode(s) is installed for information technology equipment, it must meet all of the requirements provided in which NEC section?
Grounded conductor
* 30) All but which of the following conductors are connected together with the service equipment for a service supplied by an ungrounded system?
Limit
1) When an electrical system is grounded, it is connected to Earth in a manner that will ? the voltage imposed by lightning, line surges, or unintentional contact with higher-voltage lines and stabilize the voltage to Earth during normal operation.
2.
(16) Branch circuits serving patient care spaces are required to be provided with a minimum of how many equipment grounding conductors?
Grounding
11) Without a connection to ground (Earth) there is no ?
C Normal current-carrying conductor functions
52) Equipment grounding conductors perform all but which of the following functions?
ground fainlt current
10) Where an ungrounded system is installed, non-current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the supply system grounded equipment in a manner that creates a low-impedance path for ? that is capable of carrying the maximum fault current likely to be imposed on it.
Copper or aluminum or cCopper claD
12) Which materials are permitted for use as main and system bonding jumpers?
Supply-Side Bonding 'Jumper
13 A conductor installed on the supply side of a service or within a service equipment enclosure(s), or for a separately derived system, that ensures the required electrical continuity between metal parts required to be electrically connected defines what?
6 Awg
14) The bonding jumper installed between a power system grounding electrode and a separate electrode installed for a TV antenna system and equipment shall not be smaller than ?.
250.4(B)1
15) Which NEC rule addresses what is intended to be accomplished by the grounding requirements for ungrounded systems?
Shall
18) Where a lightning protection system ground network of electrodes is installed at a building or structure, it ? be bonded to the electrical service or supply grounding electrode system,
not less than 6"
19) If two ground rod type electrodes are installed for an AC service, what is the minimum separation distance required between the two ground rods?
Simultaneously
2) Grounding and bonding are two safety functions that occur ? to provide essential protection for equipment and property, and also reduce shock hazards.
Z50.66
20) Table ? must generally be used for sizing the bonding jumpers or conductors used to connect grounding electrodes together to form a grounding electrode system.
It has to be a bare stranded conductor and at least 25' in length.
21) A ground ring electrode must meet all but which of the following?
d. If there is not less than 1O' in direct contact with the Earth
22) A metal underground water pipe qualifies as a grounding electrode in accordance with which of the following?
Corrosion protection
23) Where a length of reinforcing rod (rebar) is used as a concrete-encased electrode, rebar extensions that exit from the concrete shall be permitted To be exposedto the earth withoutthe use of ?
d. Any of the above qualify as a grounding electrode
24) A metal in-ground support structure qualifies as a grounding electrode in accordance with which of the following?
Routed with
25) Where a service is supplied by a grounded system, the grounded conductor is required to be ? and connected to the service disconnecting means enclosure.
Ungrounded service conductor
26) Where a service is supplied by a corner-grounded delta system, the minimum size required for the grounded conductor shall not be less than ?.
At the transformer or Elsewhere outside the building
28) Where the utility transformer supplying the service is located outside of the building or structure served, at least one additional grounding connection shall be made from the grounded service conductor to a grounding electrode at which of the following locations?
* 2 AwG
29) What is the minimum size grounded conductor required for a service if the ungrounded service-entrance conductors are sized at 4/0 copper and the grounded conductor carries no load?
Intentional
3) If an electrical system is not grounded, there is no ? connection between any system conductor and the Earth.
Table 250. 102 C 2
31) Which NEC table is used to establish the minimum size grounded conductor for a service supplied by a grounded system?
a. The grounded electrical system supplying the service C. The service equipment enclosure b. The grounded service conductor
32) The grounding electrode conductor connects which of the following to the Earth?
a. At the load end of the service drop c. Within the service equipment enclosure b. At the load end of the service lateral
33) The grounding electrode conductor connection for a service can be made at which of the following accessible locations?
18"
34) Aluminum GEC connections are not permitted to be terminated less than ? of the Earth unless installed in an enclosure that is suitable for the environment, such as in the bottom of a switchboard or switchgear.
250 kcmil
35) What is the minimum size required for a wire-type aluminum or copper-clad aluminum common grounding electrode conductor installed for multiple separately derived systems in a building?
Bonded at both ends
36) A ferrous metal enclosure for a grounding electrode conductor is required to be bonded to the grounding electrode at ? where the ferrous metal enclosure is not physically continuous from a cabinet or equipment to the grounding electrode.
6 Copper
37) what is the maximum size grounding electrode conductor required where the connection to Earth is a sole connection through only ground rod-type electrodes?
#2 copper
38) Where the grounding electrode for a building is a metal underground water pipe electrode, what is the minimum Size copper grounding electrode conductor tap thatis extended from a commongrounding electrode conductor to a service disconnect that is supplied by 250 kcmil copper service entrance conductors?
Sys tem bunding Jumper
39) The ? jumper is the connection between the grounded circuit conductor and the supply-side bonding jumper, or the equipment grounding conductor, or both, at a seperately derived system.
grounded
4) An installation of an ungrounded system does not include a(n) ? conductor.
10 Coppr
40) What is the minimum size bonding jumper required for a metallic compressed air piping system if the branch circuit supplying the equipment is protected by a 60-ampere breaker?
3/0 Copper
41) What is the maximum size copper bonding jumper for a metallic water piping system installed for a building that is supplied by a 4,000 ampere, 3-phase, 4-wire, 48OY/277-volt service?
Part V
42) Which part of Article 250 contains the specific prescriptive requirements for bonding?
an effecive gronnd fault current path
43 Normally non-current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equip, are required to be connected together and to the electrical supply source in a manner that establishes a(n) ?
1/0
44) If the ungrounded service conductors are 1,000 kcmil copper (two 500 kcmil parallel copper conductors) and all are installed in two separate raceways, what is the minimum size required for a copper wire-type supply-side bonding jumper for each raceway? Vo
#12
45) What is the minimum size bonding jumper for a metal gas piping system that supplies a furnace that is protected with a 20-ampere branch circuit?
250.122
46) Where necessary to comply with the performance requirements in Section 250.4(A)(5) or (B)(4), wire-type equipment grounding conductors shall not be smaller than the sizes provided in Table ?.
each raceway of Parallel run
47) When installing a feeder circuit in a parallel raceway arrangement, any wire-type equipment grounding conductor is required to be installed in ?.
250. 119
48) The requirements for identification of equipment grounding conductors are provided in which NEC section?
a. All EGCS associated with any branch circuits
49) Where branch circuit conductors are spliced within by a box, which equipment grounding conductors (EGCS) associatedan outlet box or terminated on equipment within or supported within the box or to the box with devices suitable for the use in accordance with 250.8 and 250.148(A) through (D)?
Facilitate overcurrent device operation
5) Electrical systems are grounded to accomplish all but which of the following performance objectives?
@equipment grounding conductor
50)f branch circuit or feeder conductors are increased in size due to ampacity correction factors, the ? does not have to be increased in size above the minimum sizes specified in Table 250.122.
a. equipment grounding conductor b. grounded conductor C. ungrounded conductor(s)
51) The NEC generally requires all conductors of an AC circuit, including the ? be kept close together by installing them in the same raceway, cable, or trench.
green octagonal nut that is easily removed
55) Equipment grounding conductor terminations on devices such as receptacles must be identified using all but which of the following means?
In a meter socket enclosure on the supply-side of the service disconnecting means enclosure
56) The grounded (usually the neutral) conductor must generally be kept separated (insulated) from ground and grounded metal parts in all but which of the following locations?
equipment grounding conductor
57) When an auxiliary grounding electrode is installed at a light pole base in parking lot, an auxiliary grounding electrode is permitted to be connected to the equipment to which the ? Is connected.
a. On the supply side of a panelboard supplied by a feeder
58) the grounded conductor is permitted for grounding non-current-carrying metal parts in all but which of the following locations?
effective
6) In a grounded system, normally non-current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the electrical supply source in a manner that establishes a(n) ? ground fault current path.
grounded conductor
60) Objectionable current is often the result of connections between a(n) ? and ground or grounded metal parts on the load side of the service grounding point or the grounding point for a separately derived system.
dlisted nonmetallic raceway fittings
61) Where installed for the reduction of electromagnetic interference on the grounding circuit, equipment supplied by branch circuit shall be permitted to be isolated from a metal raceway containing circuits supplying only that equipment by one or more ? located at the point of attachment of the raceway to the equipment enclosure, as long as the circuit contains an insulated equipment grounding conductor installed according to 250.146(D).
©it shall have green insulation with one or more yellow stripes along its entire length.
62) A branch circuit that supplies an isolated grounding receptacle installed in a Category 2 (general care) space, shall meet which of the following?
Oreduction of electrical noise (electro-magnetic interference)
63) Where installed for the ? on the grounding circuit, a receptacle in which the grounding terminal is purposely insulated from the receptacle mounting means shall be permitted.
impedance
7) The total opposition to current in an AC circuit is known as the ? of the circuit.
A capacitor
8) Two conductors separated by an insulator best describes the basic physical characteristics of which of the following?
grounded Con un grounded, and EGC
9) All conductors of an AC circuit are generally required to be installed together in the same raceway, cable, or trench. This requirement also includes the ? of the circuit.
10 coppr
For a 30-ampere branch circuit, the equipment bonding conductor from a grounded metal box to a grounding-type receptacle must not be smaller than ?.
OThe rating of the overcurrent device protecting the circuit
The minimum size wire-type equipment grounding conductors is based on which of the following?
d. All of the above
Where a service is supplied by a grounded system, the grounded conductor is connected to which of the following conductors at the service equipment?
