Articles 200 - 250 - Wiring & Protection
*Rod* and *pipe grounding electrodes* shall not be less than ____ in length. (a) 6 ft (b) 8 ft (c) 10 ft (d) 20 ft
(b) 8 ft 250.52(a)(5)
An *encased* or *buried connection* to a concrete-encased, driven, or buried *grounding electrode* shall be accessible. (a) true (b) false
(b) false 250.68(a)
Grounding electrode conductors or supply side bonding jumpers or conductors shall not be permitted within raceways containing service conductors (a) true (b) false
(b) false 230.7
A *type 2 surge protective device* is permitted to be connected on either the *line* or *load side* of the service equipment (a) true (b) false
(b) false 242.14(a)
A separate water piping bonding jumper shall be required if the metal frame of a building or structure is used as the grounding electrode for a separately derived system and is bonded to the metal water piping in the area served by the separately derived system (a) true (b) false
(b) false 250.104(d)(1)
When *bonding enclosures, metal raceways, frames and fittings,* any nonconductive paint, enamel, or similar coating shall be removed at ____. (a) contact surfaces (b) threads (c) contact points (d) all of these
(d) all of these 250.96(a)
Where a premises wiring system contains feeders supplied from more than one nominal voltage system, each ungrounded conductor of a feeder shall be identified by phase or line and system by ____ or other approved means (a) color coding (b) marking tape (c) tagging (d) any of these
(d) any of these 215.12(c)(1)(a)
*Outside feeder tap conductors* can be of *unlimited length without overcurrent protection* at the point they receive their supply if the tap conductors ____ (a) are protected from physical damage (b) terminate at a single overcurrent device equal to or less than their ampacity (c) the overcurrent device is part of the building feeder disconnect (d) all of these
(d) all of these 240.21(b)(5)(1)(2)(3)
*Metal water piping system(s)* shall be *bonded* to the ____, or to one or more grounding electrodes used, if the grounding electrode connector or bonding jumper to the grounding electrode is of sufficient size. (a) grounded conductor at the service (b) service equipment enclosure (c) grounding electrode conductor if of sufficient size (d) any of these
(d) any of these 250.104(a)(1)(1)(2)(3)(4)
The *metal water piping system(s)* installed in or attached to a building or structure [250.104(a)(3)] shall be bonded to ____. (a) the building or structure disconnecting means enclosure where located at the building or structure (b) the equipment grounding conductor run with the supply conductors (c) one or more grounding electrodes used (d) any of these
(d) any of these 250.104(a)(3)(1)(2)(3)
In grounded systems, normally *noncurrent carrying electrically conductive materials* that are likely to become energized shall be connect ____ in a manner that establishes an *effective ground-fault current path* (a) together (b) to the electrical supply source (c) to the closest grounded connector (d) together and to the electrical supply source
(d) together and to the electrical supply source 250.4(a)(4)
Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all ____ conductors at the point where the branch circuit originates (a) circuit (b) grounded (c) grounding (d) ungrounded
(d) ungrounded 210.4(b)
Where rock bottom is encountered at an angle up to 45 degrees when driving a rod or pipe electrode, the electrode shall be permitted to be buried in a trench ____ deep. (a) 30 in (b) 6 ft (c) 8 ft (d) 10 ft
(a) 30 in 250.53(a)(4)
An ____ shall be used to connect the *grounding terminal* of a *grounding type receptacle* to a *grounded box* (a) equipment bonding jumper (b) grounded conductor jumper (c) equipment bonding jumper or grounded conductor jumper (d) equipment bonding jumper and grounded conductor jumper
(a) equipment bonding jumper 250.146
120v, single phase, 15a and 20a branch circuits supplying outlets and devices installed in ____ of hotels and motels shall be protected by the means described in 210.12(a)(1) - (6) (a) guest rooms (b) conference rooms (c) lobbies and common hallways (d) game rooms
(a) guest rooms 210.8(b)(5)
*Overhead service conductors* shall have a *minimum clearance* from final grade of ____ above areas or sidewalks accessible only to pedestrians, measured from final grade or other accessible surface where the voltage does not exceed 150 volts to ground (a) 8 ft (b) 10 ft (c) 12 ft (d) 15 ft
(b) 10 ft 230.24(b)(1)
An *insulated grounding conductor* ____ or smaller shall be identified by a *continuous white or gray outer finish* or by three continuous white or gray stripes along its entire length on other than *green insulation* (a) 8 awg (b) 6 awg (c) 4 awg (d) 3 awg
(b) 6 awg 200.6(a)(1)(2)(3)
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(c)(4), the installation shall be ____ in accordance with 250.30(a) (a) AFCI protected (b) grounded and bonded (c) isolated (d) all of these
(b) grounded and bonded 250.32(b)(2)(b)
A *service disconnecting* means shall be installed at an ____ location (a) dry (b) readily accessible (c) outdoor (d) indoor
(b) readily accessible 230.70(a)(1)
*Service entrance* and *overhead service conductors* shall be arranged so that ____ will not enter the service raceway or equipment (a) dust (b) vapor (c) water (d) lightning
(c) water 230.54(g)
Ground fault protection of equipment shall be required for a feeder disconnect if the disconnect is rated ____ (a) 800a, 208v (b) 800a, 480v (c) 1000a, 208v (d) 1000a, 480v
(d) 1000a, 480v 215.10
The *minimum clearance* for *overhead service conductors* not exceeding 600v that pass over *commercial areas* subject to *truck traffic* is ____ ft (a) 10 (b) 12 (c) 15 (d) 18
(d) 18 230.24(b)(4)
At the time of installation, *grounded conductors* ____ or larger can be identified by distinctive white or gray markings at their terminations (a) 10 awg (b) 8 awg (c) 6 awg (d) 4 awg
(d) 4 awg 200.6(b)(4)
In other than dwelling units, *GFCI protection* shall be provided for all 15a and 20a, 125v, single phase receptacles installed within ____ ft from the top inside edge of the bowl of a sink (a) 3 (b) 4 (c) 5 (d) 6
(d) 6 210.8(b)(5)
Where a method to *reduce clearing time* for fuses rated 1200a or greater is required in accordance with 240.67(b), the ____ reduction system shall be performance tested when first installed on site (a) ground fault (b) short circuit (c) arc fault (d) arc energy
(d) arc energy 240.67(c)
At least one receptacle outlet shall be located within ____ of the outer end of a peninsular countertop or work surface (a) 1 ft (b) 2 ft (c) 3 ft (d) 4 ft
(b) 2 ft 210.52(c)(2)(b)
The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed ____ of a multiple outlet branch circuit rating (a) 25% (b) 50% (c) 80% (d) 100%
(b) 50% 210.23(a)(2)
What is the *minimum size* copper equipment bonding jumper for a 40A rated circuit? (a) 14 AWG (b) 12 AWG (c) 10 AWG (d) 8 AWG
(c) 10 AWG 250.102(d) - table 250.122
For installations that *supply only limited loads of single branch circuit*, the service disconnecting means shall have a rating not less than ____ (a) 15a (b) 20a (c) 25a (d) 30a
(a) 15a 230.79(a)
The *size* of the *grounded electrode conductor* for a building or structure supplied by a feeder shall not be smaller than that identified in ____, based on the largest ungrounded supply conductor. (a) 250.66 (b) 250.102 (c) 250.122 (d) table 310.16
(a) 250.66 250.32(e)
Where *exposed to weather, raceways enclosing service entrance conductors* shall be ____ for use in *wet locations* and arranged to drain (a) approved or listed (b) listed and identified (c) suitable (d) listed and labeled
(a) approved or listed 230.53
Where the lighting load for a non dwelling building is designed and constructed to comply with an energy code adopted by the local authority, the lighting load shall be permitted to be calculated using the unit values specified in the ____ (a) energy code (b) manufacturers instructions (c) NEC (d) lighting design manual
(a) energy code 220.12(b)
The 125% multiplier for a continuous load as specified in 210.20(a) ____ included when using the unit loads in table 220.12 for calculating the minimum lighting load for a specified occupancy (a) is (b) is not (c) is permitted to be (d) shall not be
(a) is table 220.12
Type *MC cable* provides an *effective ground fault current path* and is recognized by the NEC as an equipment grounding conductor when ____ (a) it contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1) (b) the cable assembly contains a bare copper conductor (c) only when its hospital grade type MC cable (d) it is terminated with bonding bushings
(a) it contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1) 250.118
*Alternating-current circuits* of less than *50v* shall be grounded if supplied by a transformer whose supply system exceeds 150 volts-to-ground (a) true (b) false
(a) true 250.20(a)(1)
The grounding of electrical systems, circuit conductors, surge arrestors, surge-protective devices, and conductive normally noncurrent-carrying metal parts of equipment shall be installed and arranged in a manner that will *prevent objectionable current.* (a) true (b) false
(a) true AKA: not spliced w/ neutral
Where a *lighting outlet(s)* is installed for *interior stairways*, there shall be a *wall switch* at *each floor level* and *each landing level* that includes an *entryway* where the stairway between floor levels has *6 risers or more* unless remote, central, or automatic control is used (a) true (b) false
(a) true 210.70(c)
*Overhead service conductors* shall have a *minimum vertical clearance* of ____ ft from final grade over residential property and driveways, as well as over commercial areas *not subject to truck traffic* where the voltage does not exceed 300 volts to ground (a) 10 (b) 12 (c) 15 (d) 18
(b) 12 230.24(b)(2)
If a 20a branch circuit supplies multiple receptacles, the receptacles shall have an ampere rating of no less than ____ (a) 10a (b) 15a (c) 20a (d) 30a
(b) 15a 210.21(b)(3) & table 210.21(b)(3)
Where bonding jumper(s) are used to connect the grounded electrodes together to form the grounded electrode system, rebar is permitted to be used as a conductor to *interconnect* the electrodes. (a) true (b) false
(b) false 250.53(l)
If a building or structure is supplied by a service or feeder with ____ or more *disconnecting means* in *separate enclosures,* the grounded electrode connections shall be made in accordance with 250.64(d)(1), 250.64(d)(2) or 250.64(d)(3). (a) one (b) two (c) three (d) four
(b) two 250.64(d)
Where practicable, *rod* *pipe* and *plate electrodes* shall be installed ____. (a) directly below the electrical meter (b) on the north side of the building (c) below permanent moisture level (d) all of these
(c) below permanent moisture level 250.53(a)(1)
In an ac system, if the *size* of the *grounding electrode conductor* or *bonding jumper* connected to a *concrete-encased electrode* does not extend on to the other type of electrodes that require a *larger size* of conductor, the grounded electrode conductor shall not be required to the larger than ____ AWG copper. (a) 10 (b) 8 (c) 6 (d) 4
(d) 4 250.66(b)
The grounded conductor of each separately derived system *shall be bonded to the nearest available point of the metal water piping system(s)* 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 (a) true (b) false
(a) true 250.104(d)(1)
Concrete-encased electrodes of ____ shall *not be required to be part of the grounded electrode system* where the steel reinforcing bars or rods aren't accessible for use without disturbing the concrete. (a) hazardous (classified) locations (b) health care facilities (c) existing building or structures (d) agricultural buildings with equipotential planes
(c) existing building or structures 250.50
*Underground service conductors* shall have ____ (a) adequate mechanical strength (b) sufficient ampacity for the loads calculated (c) 90*C insulation rating (d) adequate mechanical strength and sufficient ampacity for the loads calculated
(d) adequate mechanical strength and sufficient ampacity for the loads calculated 230.31(a)
The vertical clearance of final spans of *overhead service conductors* above, or within ____ ft measured horizontally of platforms, projections, or surfaces that will permit personal contact shall be maintained in accordance with 230.24(b) (a) 3 (b) 6 (c) 8 (d) 10
(a) 3 230.9(b)
For *attics* and *underfloor spaces, utility rooms, and basements* in all occupancies, at least, ____ lighting outlets containing a switch or controlled by a wall switch shall be installed where these spaces are used for storage or contain equipment requiring servicing (a) one (b) two (c) three (d) four
(a) one 210.70(c)
