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Understanding the NEC Volume 1 > Article 110 > Flashcards

Article 110 Flashcards

1
Q

(T/F) Working space is required fro the back or sided of assemblies where all connections and all renewable or adjustable parts are accessible from the front

A

False

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2
Q

(Working spaces) Condition 1 is measured from the equipment to what?

A

Insulated Material

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3
Q

What does Article 110 cover?

A

Requirements for electrical installations

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4
Q

(T/F) The NEC prohibits sprinklers from spraying water on electrical equipment

A

False

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5
Q

(T/F) The working space of equipment can overlap the working space for other equipment

A

True

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6
Q

Unless marked otherwise, what is the AIC for circuit breakers and fuses?

A

CB’s = 5,000

Fuses = 10,000 AIC

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7
Q

Panelboards supplied by a 4-wire, delta-connected, three-phase system must have the high-leg conductor terminate to the _____ phase of a panelboard

A

B

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8
Q

(T/F) If the code requires a disconnect to be lockable in the open position, the provisions for locking must remain in place whether the lock is installed or not

A

True

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9
Q

In a high-leg system, the conductor with 208V to ground must be durably and permanently marked by an out finish _____ in color, or other effective means

A

Orange

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10
Q

Electrical equipment must have a short-circuit current rating that permits the circuit protective device to open from what?

A

Short Circuit or Ground Fault

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11
Q

Enclosures must be marked with what?

A

An enclosure-type number

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12
Q

The footprint space of electrical equipment extending from grade to a heigh of ____ feet above the equipment must be dedicated for the electrical installation.

A

6

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13
Q

(T/F) Sprinkler protection piping is permitted in the dedicated space

A

False

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14
Q

(T/F) Electrical raceways and cables not associated with the dedicated space can be within the dedicated space. These aren’t considered “equipment foreign to the electrical installation”

A

True

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15
Q

Service equipment, switchboards, switchgear, and panelboards, as well as motor control centers located indoors must have illumination located indoors controlled by ______ means.

A

Manual

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16
Q

Conductor sizes larger than ______ are expressed kcmil (thousand circular mills)

A

4/0

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17
Q

What is the current, in amperes, available at a given point in the electrical system called?

A

Available Short-Circuit Current

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18
Q

(T/F) Copper and aluminum conductors can make contact with each other in a device even if the device isn’t listed or identified for that purpose

A

False

19
Q

The working space must be sufficient width, depth, and height to permit all equipment door to open _____ degrees

A

90

20
Q

The height of the working space in front of equipment isn’t permitted to be less than _____ feet, measured from the grade, floor, platform, or the equipment height, whichever is ______.

A

6.5 , Greater

21
Q

Is a dropped, suspended, or similar ceiling considered a structural ceiling?

A

No

22
Q

When the conductor material is not specified in a rule, the sizes given in the NEC are based on a _______ conductor

A

Copper

23
Q

The width of the working space must be a minimum of ____, but in no case less than the _____ of the quipment

A

30” , Width

24
Q

(T/F) Conductors aren’t required to be twisted together prior to the installation of a twist-on wire connector, unless specifically required in the installation instructions

A

True

25
Q

(Working spaces) Condition 2 is measured from the equipment to what?

A

Grounded Parts

26
Q

What does AIC stand for?

A

Ampere Interrupting Capacity

27
Q

Switches and receptacles marked _________ are designed to ensure a good connection through the use of a larger contact area and compatible materials

A

CO/ALR

28
Q

The standard for meter equipment required the high-leg conductor (208V to neutral) to terminate on the _____ phase of the meter socket enclosure

A

C (right)

29
Q

Equipment such as raceways, cables, wireways, cabinets, panels, and so on, can be located above or below electrical equipment, but must not extend more than ___ inches into the equipments working space

A

6

30
Q

The voltage rating of electrical equipment isn’t permitted to be less than the ________ voltage of a circuit to which it’s connected

A

Nominal

31
Q

Overcurrent protection devices such as circuit breakers and fuses are intended to ______ the circuit

A

Interrupt

32
Q

What does AIR stand for?

A

Ampere Interrupting Rating

33
Q

The NEC doesn’t specify the termination location for the high-leg conductor in switch equipment, but the generally accepted practice is to terminate this conductor to the _____ phase

A

B

34
Q

Is an electrical equipment room or enclosure containing electrical apparatus controlled by a lock(s) considered accessible to qualified persons?

A

Yes

35
Q

Dedicated space ______ the footprint of the equipment from the floor to ____ feet above the equipment or to the structural ceiling (whichever is lower)

A

Equal ; 6

36
Q

(T/F) Working space is permitted for storage while not being worked on.

A

False

37
Q

Working space is measured from the enclosure _____

A

Front

38
Q

(Working spaces) Condition 3 is measured from the equipment to what?

A

Exposed Live Parts

39
Q

Live parts of electrical equipment operating at ____ to _____ between ungrounded conductors must be guarded against accidental contact

A

50V ; 1,000V

40
Q

Over current protection devices must have an interrupting rating at the _______ circuit voltage at least ______ to the current available at the line terminals of the equipment

A

Nominal ; Equal

41
Q

The “high-leg” conductor is also sometimes called what?

A

Wild leg, stinger leg, or bastard leg

42
Q

What is the reason copper and aluminum conductors shouldn’t be in contact with each other?

A

A corrosion develops between them due to galvanic action which results in increased contact resistance

43
Q

The available short-circuit current is highest at what point in the electrical system?

A

Utility Transformer

44
Q

(T/F) Foreign systems can be located above the dedicated space if protection is installed to prevent damage to the electrical equipment from condensation, leaks, or breaks in the foreign systems

A

True

Understanding the NEC Volume 1 (3 decks)

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