Articles 110 -2008 (5 pgs, 50 questions) Flashcards
In judging equipment for approval, considerations such as the following shall be evaluated
all of these:
-mechanical strength
-wire-bending space
-arcing effects
110.3
listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling
False
conductors shall be ______ unless otherwise provided
copper
110.5
conductor sizes are expressed in American Wire Gauge (AWG) or ______
Circular Mils
110.6
Wiring shall be installed so that the completed system will be free from ____, other than as required or permitted elsewhere in the Code
all of these:
-short circuits
-ground faults
-connections to earth
only wiring methods recognized as ____ are included in this Code
suitable
equipment intended to interrupt current at fault levels shall have an interrupting rating sufficient for the nominal circuit voltage and the current that is available at the the line terminals of the equipment
TRUE
110.9
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 components of the circuit
all of these:
-overcurrent protective devices
-total circuit impedance
-component short-circuit current ratings
unless identified for use in the operating environment, no conductors or equipment shall be ____ having a deteriorating effect on the conductors or equipment
all of these:
-located in damp or wet locations
-exposed to fumes, vapors, or gases
-exposed to excessive temperatures
some cleaning and lubricating compounds can cause severe deterioration of many materials used for insulating and structural applications in equipment
TRUE
110.11 FPN
the NEC requires that electrical work be _____
installed in a neat and workmanlike manner
110.12
accepted industry workmanship practices are described in ANSI/ NECA 1-2006, Standard Practices for Good Workmanship in Electrical Contracting, and other ANSI approved installation standards
TRUE
Unused openings other than those intended for the operation of equipment, intended for mounting purposes, or permitted as part of the design for listed equipment shall be _____
effectively closed to afford protection substantially equivalent to the wall of the equipment
Internal parts of electrical equipment, including _____, shall not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or corrosive residues
all of these:
-busbars
-wiring terminals
-insulators
110.12 (B)
electrical equipment that depends on ____ for cooling of exposed surfaces shall be installed so that airflow over such surfaces is not prevented by walls or by adjacent installed equipment
natural circulation of air and convection principles
110.13 (B)
conductor terminal and splicing devices must be _____ for the conductor material and they must be properly installed and used
identified
110.14
many terminations and equipment are marked with ______
a tightening torque
110.14 FPN
connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be made by means of _____
any of these:
-solder lugs
-pressure connectors
-splices to flexible leads
the temperature rating associated with the ampacity of a ____ shall be so selected and coordinated so as not to exceed the lowest temperature rating of any connected termination, conductor, or device
all of these:
-terminal
-conductor
-device
110.14 (C)
conductor ampacity shall be determined using the ____ column of Table 310.16 for circuits rated 100A or less or marked for 14 AWG through 1 AWG conductors, unless the equipment terminals are listed for use with conductors that have higher temperature ratings
60 degree C
110.14 (C)(1)(a)
for circuits rated 100A or less, when the equipment terminals are listed for use with 75 degree Celcius conductors, the ______ column of Table 310.16 shall be used to determine the ampacity of THHN conductors installed
75 degree C
conductors shall have their ampacity determined using the _____ column of Table 310.16 for circuits rated over 100A, or marked for conductors larger that 1 AWG, unless the equipment terminals are listed for use with higher temperature rated conductors
75 degree C
110.14 (C)(1)(a)
separately installed pressure connectors shall be used with conductors at the _____ not exceeding the ampacity at the listed and identified temperature rating of the connector
ampacities
110.14(C)(2)
on a 4 -wire, delta-connected system where the midpoint of one phase winding is grounded, the conductor having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is _____ in color
orange
110.15
electrical equipment such as switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers in commercial and industrial occupancies that are likely to require ____ while energized shall be field-marked to warn qualified persons of the danger associated with an arc flash
any of these:
-examination
-adjustment
-servicing or maintenance
the term rainproof is typically used in conjunction with enclosure-type number _____
3R & 3RX
where required by the Code, markings on all electrical equipment shall contain voltage, current, wattage, or other ratings with durability to withstand _____
the environment involved
110.21
each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so ________
the purpose is evident
110.22 (A)
the NEC requires tested series-rated installations of circuit breakers or fuses to be field- marked to indicate the current rating for which the system has been installed
TRUE
110.22(C)
sufficient access and _____ shall be provided and maintained about all electrical equipment to permit ready and safe operation and maintenance of such equipment *****
working space
110.26
a minimum depth of _____ working space to live parts operating at 277 volts-to-ground is required where there are exposed live parts on one side and no live or grounded parts on the other side.
3 ft
110.26 (A) (1)
the minimum working space on a circuit that is 120 volts-to-ground, with exposed live parts on one side and no live parts on the other side of the working space is ____
3 feet
concrete, brick, or tile walls are considered ____, as it applies to working space requirements.
grounded
the required working space for access to live parts operating at 300 volts-to-ground, where there are exposed live parts on one side and grounded parts on the other side, is _____
3.5 feet
the dimension of working space for access to live parts operating at 300 V, nominal-to-ground, where there are exposed live parts on both sides of the workspace is _____ according to Table 110.26(A)(1)
4 feet
Working space distances for enclosed live parts shall be measured from the _____ of equipment or apparatus, if the live parts are enclosed.
enclosure
110.26 (A) (1)
the working space in front of the electric equipment shall not be less than _____ wide, or the width of the equipment, whichever is greater
30 inches
110.26 (A) (2)
equipment associated with the electrical installation can be located above or below other electrical equipment within their working space when the associated equipment does not extend more than _____ from the front of the electrical equipment
6 inches
110.26 (A)(3)
working spaces shall not be used for ______
storage
110.26 (B)
when normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be suitably
guarded
110.26 (B)
for equipment rated 1,200 A or more and over 6 ft wide that contains overcurrent devices, switching devices, or control devices, there shall be one entrance to and egress from the required working space not less than 24 in wide and _____ high at each of the working space
6 ft 6 in
for equipment rated 1,200 A or more and over 6ft wide that contains overcurrent devices, switching devices, or control devices; and where the entrance to the working space has a personnel door less than 25ft from the working space, the door ____
shall open in the direction of egress and be equipped with panic hardware or other devices so the door can open under simple pressure
110.26 (C) (3)
illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, and motor control centers _____
located indoors
110.26 (B)
the minimum headroom of working spaces about motor control centers is ______
6.5 feet
110.26 (e)
the minimum headroom for working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6.5 ft, except for service equipment or panelboards in existing dwelling units that do not exceed 200A
false
heating, cooling, or ventilating equipment shall not be installed in the dedicated space above a panelboard or switchboard
TRUE
110.26 (F)(1)(A)
the dedicated equipment space for electrical equipment that is required for panelboards is measured from the floor to a height of ____ above the equipment, or to the structural ceiling, whichever is lower.
6 feet
110.26 (F)(1)(a)
the dedicated space above a panelbaord extends to a dropped or suspended ceiling, which is considered a structural ceiling
false
electrical equipment rooms or enclosures housing electrical apparatus that are controlled by a lock(s) shall be considered ____ to a qualified persons.
accessible
in locations where electrical equipment is likely to be exposed to _____, enclosures or guards shall be so arranged and of such strength as to prevent such damage.
physical damage
110.27 (B)
