Random Order Articles 90-234

Isolated 100

"____" means that an object is not readily accessible to persons unless special means for access are used.

Neutral point 100

A neutral conductor is the conductor connected to the ______ of a system, which is intended to carry neutral current under normal conditions.

True 210.52 (B)(2) Ex. 1

A receptacle connected to one of the dwelling unit small-appliance branch circuits can be used to supply an electric clock.

1/0 AWG 250.102 (C)(1)

A service is supplied by three metal raceways, each containing 600 kcmil ungrounded conductors. Determine the copper supply-side bonding jumper size for each service raceway.

grounded conductor 100

A system or circuit conductor that is intentionally grounded is called a(n) "______".

True 250.20 (B)(2)

Alternating-current systems of 50V to 1,000V that supply premises wiring systems shall be grounded where the system is three-phase, 4-wire, wye connected with the neutral conductor used as a circuit conductor.

True 210.70 (a)(1)

At least one wall switch-controlled lighting outlet must be installed in every habitable room and bathroom of a dwelling unit.

vertical 240.33

Enclosures for overcurrent devices shall be mounted in a_____ position unless impracticable.

100 220.51

Feeder and service loads for fixed electric space heating shall be calculated at ____ percent of the total connected load.

Where subject to corrosive vapors unless suitable for the application. In hoistways. In any hazardous (classified) location. ALL OF THESE 322.12

Flat cable assemblies shall not be installed ______.

peninsular 210.52 (C)(3)

For the purpose of determining the placement of receptacles in a dwelling unit kitchen, a(n) ____ countertop is measured from the connecting edge.

Limit voltages due to lightning, line surges, or unintentional contact with higher-voltage lines, AND, stabilize the voltage-t-ground during normal operation. 250.4 (A)(1)

Grounded electrical systems shall be connected to earth in a manner that will _________.

Solder 250.8 (B)

Grounding and bonding connection devices that depend solely on ____ shall not be used.

6AWG 250.64 (B)

Grounding electrode conductors smaller than ____ shall be in rigid metal conduit, IMC, PVC conduit, electrical metallic tubing, or cable armor.

18 inches 225.19(A) Ex. 3

If a set of 120/240V overhead feeder conductors terminates at a through-the-roof raceway or approved support, with less than 6 ft. of these conductors passing over the roof overhang, the minimum clearance above the roof for these conductors is ______.

1/0 310.10 (H)(1)

In general, the minimum size conductor permitted for use in parallel installations is ____AWG

lighting outlets 210.70 (A)(1) Ex. 1

In rooms other than kitchens and bathrooms of dwelling units, one or more receptacles controlled by a wall switch shall be permitted in lieu of _____.

shall 250.106

Lightning protection system ground terminals _____ be bonded to the building or structure grounding electrode system.

metallically 300.10

Metal raceways, cable armor, and other metal enclosures shall be ____ joined together into a continuous electric conductor so as to provide effective electrical continuity.

Supply only line-to-neutral loads 210.4 (C)

Multiwire branch circuits shall ______.

True 225.19 (D)(3)

Outside wiring shall not be installed beneath openings through which materials may be moved and shall not be installed where they will obstruct entrance to these buildings' openings.

8 230.24 (A)

Overhead service conductors installed over roofs shall have a vertical clearance of ____ft. above the roof surface, unless a lesser distance is permitted by an exception.

1/4 314.15

Surface-type cabinets, cutout boxes, and meter socket enclosures in damp or wet locations shall be mounted so there is at least ____in. airspace between the enclosure and the wall or supporting surface.

75 degrees, for wet locations 310.104(A)

THWN insulated conductors are rated _______.

Overcurrent devices. Total circuit impedance. Equipment short-circuit current ratings. ALL OF THESE 110.10

The ____ of a circuit shall be selected and coordinated to permit the circuit protective devices to clear a fault without extensive damage to the electrical equipment of the circuit.

True 250.122 (A)

The equipment grounding conductor shall not be required to be larger than the circuit conductors.

performance tested 230.95 (C)

The ground-fault protection system for service equipment shall be ____ when first installed on site.

Be accessible for connection and inspection. Consist of a set of terminals with the capacity for connection of not less than three intersystem bonding conductors. Not interfere with opening the enclosure for a service, building/structure disconnecting means, or metering equipment. ALL OF THESE 250.94 (1)(2)(3)

The intersystem bonding termination shall ______.

five times the diameter of the cable 324.24

The radius of the curve of the inner edge of any bend shall not be less than ____ for Type AC cable.

pressure connectors or clamps 230.81

The service conductors shall be connected to the service disconnecting means by ____ or other approved means.

40 220.82 (B)

Under the optional method for calculating a single-family dwelling service, general loads beyond the initial 10 kVA are assessed at a ____ percent demand factor.

85 220.54

Using the standard load calculation method, the feeder demand factor for five household clothes dryers is ____ percent.

3/0 AWG 250.66

What size copper grounding electrode conductor is required for a service that has three sets of 600 kcmil copper conductors in phase?

the lowest temperature rating for any of the insulated conductors. 310.15 (B)(4)

When bare conductors are installed with insulated conductors, their ampacities shall be limited to _____.

6 ft. 320.23 (A)

When type AC cable is run across the top of a floor joist in an attic without permanent ladders or stairs, guard strips within _____ of the scuttle hole or attic entrance shall protect the cable.

not less than 1 1/4 inches from 300.4 (A)?(1)

Where cables or nonmetallic raceways are installed through bored holes in joists, rafters, or wood members, holes shall be bored so that the edge of the hole is ____ the nearest edge of the wood member.

True 250.148

Where circuit conductors are spliced or terminated on equipment within a box, any equipment grounding conductors associated with those circuit conductors shall be connected to the box with devices suitable for the use.

True 310.10 (H)(3)

Where conductors in parallel are run in separate raceways, the raceways shall have the same electrical characteristics.

30 inches 250.53 (G)

Where rock bottom is encountered when driving a ground rod at an angle up to 45 degrees, the electrode can be buried in a trench that is at least _____deep.

Cover Table 300.5 Note 1

______ is defined as the area between the top of direct-burial cable and the top surface of the finished grade.

True 210.11 (C)(3)

An individual 20A branch circuit can supply a single dwelling unit bathroom for receptacle outlet(s) and other equipment within the same bathroom.

In damp or wet locations, where subject to physical damage, where exposed to corrosive conditions, ALL OF THESE 320.12(1)(2)(4)

Armored cable shall not be installed _____.

6 320.30 (D)(3)

Armored cable used to connect recessed luminaires or equipment within an accessible ceiling can be unsecured for lengths up to ___ ft.

20A 250.118 (5)(b)

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

True 260.6 (A)

The grounding of electrical systems, circuit conductors, surge arresters, surge-protective devices, and conductive normally noncurrent-carrying metal parts of equipment shall be installed and arranged in a manor that will prevent objectionable current.

the size of the derived ungrounded conductors 250.30 (A)(2)(a)

Where a supply-side bonding jumper of the wire type is run with the derived phase conductors from the source of a separately derived system to the first disconnecting means, it shall be sized in accordance with 250.102(C), based on ________.

8 310.106 (A)

Where installed in raceways, conductors ___ AWG and larger shall be stranded.

Equipment grounding conductor 324.60

Metal shields for flat conductor cable shall be electrically continuous to the _____.

Conductors are not part of a branch circuit supplying more than one receptacle for cord-and-plug-connected portable loads. Ampacity of the conductors doesn't correspond with the standard ampere rating of a fuse or circuit breaker. Next higher standard rating selected doesn't exceed 800A. ALL OF THESE 240.4(B)

The next higher standard rating overcurrent device above the ampacity of the ungrounded conductors being protected shall be permitted to be used, provided the _____.

8 300.5 (D)(1)

Where direct-buried conductors and cables emerge from the grade, they shall be protected by enclosures or raceways to a point at least ___ ft above finished grade.