Article 110 - Requirements for Electrical Installations (QUARTER 1)
The working space in front of the electric equipment shall not be less than _____ in. wide, or the width of the equipment, whichever is greater.
30
All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage and, for outdoor installations, the space equal to the width and depth of the equipment and extending from grade to a height of _____ ft above the equipment, shall be dedicated to the electrical installation.
6
The minimum height of dedicated equipment space for motor control centers installed indoors is _____ ft above the enclosure, or to the structural ceiling, whichever is lower.
6
For large equipment 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 _____ ft high at each end of the working space.
6 1/2
The conductors and equipment required or permitted by this code shall be acceptable only if _____________.
Approved
___________ at other than dwelling units shall be legibly field marked with the available fault current, include the date the fault-current calculation was performed, and be of sufficient durability to withstand the environment involved.
Service equipment
In other than dwelling units, in addition to the requirements for field or factory marking of equipment to warn qualified persons of potential electric arc-flash hazards, a permanent label shall be field or factory applied to service equipment rated _____________ or more.
1,200A
All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage and the working clearance space for outdoor installations shall include the zone described in _____.
110.26(A)
The minimum working space on a circuit for equipment operating at 750 volts-to-ground, with exposed live parts on one side and grounded parts on the other side of the working space, is _____ ft.
4
Reconditioned equipment's original listing mark may include the mark of the certifying body and not the entire equipment label. True or False
True
When service equipment is required to be field marked with available fault current, the value of available fault current for use in determining appropriate minimum short-circuit current ratings of service equipment is available from ___________ in published or other forms.
electric utilities
Working space distances for enclosed love parts shall be measures from the __________ of equipment or apparatus if the live parts are enclosed.
enclosure or opening
Working space for equipment operating at 1000 volts, nominal, or less to ground and likely to require ______________________ while energized.
examination, adjustment, servicing, or maintenance (all of these)
Electrical equipment, such as switchboards, switchgear, panelboards, industrial control panels, meter socket enclosures, and motor control centers, that is in other than dwelling units and is likely to require ______________________ while energized, shall be field or factory marked to warn qualified persons of potential electric arc flash hazards.
examination, adjustment, servicing, or maintenance (any of these)
The NEC requires that electrical equipment shall be ___________________.
installed in a neat and workmanlike manner
Reconditioned equipment shall be identified as "reconditioned" and the original listing mark ___________.
removed
Working space shall not be used for _____.
storage
Conductor sizes are expressed in American Wire Gage (AWG) or _____________.
circular mils
Concrete, brick, or tile walls are considered _____, as applied to working space requirements.
grounded
A minimum working space depth of _____ ft to live parts of equipment 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
The required working space for access to live parts of equipment operating at 300 volts-to-ground, where there are exposed live parts on one side and grounded parts on the other side, is _____ ft.
3 1/2
The term "rainproof" is typically used in conjunction with enclosure type(s) _____.
3R and 3RX
Conductors shall have their ampacity determined using the ______ column of Table 310.16 for circuits rated over 100A, or marked for conductors larger than 1 AWG, unless the equipment terminals are lister for use with higher temperature-rated conductors.
75
Where equipment operating at 1,000V, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, all enclosure doors or hinged panels shall be capable of opening a minimum of _____ degrees.
90
Service equipment labeling shall not be required if an arc flash label is applied in accordance with _________________ industry practice.
acceptable
As applied to electrical equipment, the term "reconditioned" may be interchangeable with the term(s) "______________."
rebuilt, refurbished, or remanufactured (any of these)
Only wiring methods recognized as __________________ are included in this Code.
suitable
For large equipment that contains service disconnecting means installed in accordance with 230.71 where the combined ampere rating is _____ or more and over 6 ft wide, there shall be one entrance to and egress from the required working space not less than 24 in. wide and 6 1/2 ft high at each end of the working space
1,200A
Examples of approved means of achieving terminal connection torque values include torque tools or an experienced qualified person that can demonstrate that the proper torque has been applied. True or False
False
If a disconnecting means is required to be locked in the open position by the NEC, the disconnect shall be capable of being locked in the open or closed position. True or False
False
Conductor terminal and splicing devices shall be ________ for the conductor material and that shall be properly installed and used.
identified
Access and _______________ shall be provided and maintained about all electrical equipment to permit ready and safe operation and maintenance of such equipment.
working space
Where equipment operating at 1,000V, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, and where equipment is installed above a lay-in ceiling, there shall be an opening not smaller than _____.
22 in. x 22 in.
For large equipment 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 ______ in. wide.
24
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 ________ in. from the front of the electrical equipment.
6
For circuits rated 100A or less, when the equipment terminals are listed for use with 75 degrees Celsius conductors, the _________ column of Table 310.16 shall be used to determine the ampacity of THHN conductors.
75 degrees Celsius
General requirements for the examination and approval, installation and use, access to and spaces about electrical conductors and equipment; enclosures intended for personal entry; and tunnel installations are within the scope of ___________________.
Article 110
General requirements for the examination and approval, installation and use, access to and spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations are within the scope of _____.
Article 110
The dedicated space above a panelboard extends to a dropped or suspended ceiling, which is considered a structural ceiling. True or False
False
Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that is available at the line terminals of the equipment. True or False
True
Field marking of maximum available fault current at a service are not required in industrial installation where conditions of maintenance and supervision ensure that only qualified persons service the equipment. True or False
True
Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. True or False
True
Some cleaning and lubricating compounds can cause severe deterioration of many plastic materials used for insulating and structural applications in equipment. True or False
True
The NEC requires tested series-rated installations of circuit breakers or fuses to be legibly marked in the field to indicate the equipment has been applied with a series combination rating. True or False
True
The minimum height of working spaces about electrical equipment, switchboards, panelboards, or motor control centers operating at 1,000V, nominal, or less and likely to require examination, adjustment, servicing, or maintenance, while energized, shall be 6 1/2 ft or the height of the equipment, whichever is greater, except for service equipment or panelboards in existing dwelling units that do not exceed 200A. True or False
True
Electrical equipment rooms or enclosures housing electrical apparatus that are controlled by a lock(s) shall be considered _____ to qualified persons.
accessible
Tightening torque values for terminal connections shall be as indicated on equipment or in installed instructions provided by the manufacturer. An approved means shall be used to ____________ the indicated torque value.
achieve
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
Where caution, warning, or danger signs or labels are required by this Code, the labels shall warn of the hazards using effective _____________.
any combination of words, colors, or symbols
Unused openings, other than those intended for the operation of equipment, those intended for mounting purposes, or those permitted as part of the design for listed equipment, shall be ____________________.
closed to afford protection substantially equivalent to the wall of the equipment
The temperature rating associated with the ampacity of a _____________ shall be selected and coordinated so as not to exceed the lowest temperature rating of any connected termination, conductor, or device.
conductor
Conductors of dissimilar metals shall not be intermixed in a terminal or splicing connector where physical contact occurs between dissimilar conductors (such as ________________ and aluminum, copper and copper-clad aluminum) Unless the device is identified for the purpose and conditions of use.
copper
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
Connectors and terminals for conductors more finely stranded than Class B and Class C, as shown in table 10 of Chapter 9, shall be _________ for the specific conductor class or classes.
identified
All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage, and outdoor installations shall be _____.
installed in identified enclosures, protected from accidental contact by unauthorized personnel or by vehicular traffic, and protected from accidental spillage or leakage from piping systems (all of these)
Illumination shall be provided for all working spaces about service equipment, switchboards, switchgear, panelboards, or motor control centers _____.
installed indoors
Unless identified for use in the operating environment, no conductors or equipment shall be ____________________ having deteriorating effect on the conductors or equipment.
located in damp or wet locations, exposed to fumes, vapors, liquids, or gases, or exposed to excessive temperatures (all of these)
Acceptable industry practices for equipment labeling are described in NFPA 70E, Standard for Electrical Safety in the Workplace. This standard provides specific criteria for developing arc-flash labels for equipment that provides ___________, and so forth.
nominals system voltage and incident energy levels, arc-flash boundaries, and minimum required levels of personal protective equipment (all of these)
For equipment rated 800A or more that contains overcurrent devices, switching devices, or control devices; and where the entrance to the working space has a personnel door(s) less than 25 ft from the nearest edge of the working space, the door shall _____.
open in the direction of egress and be equipped with listed panic hardware
NFPA 70E, Standard for Electrical Safety in the Workplace, provides guidance, such as determining the severity of potential exposure, planning safe work practices, arc-flash labeling, and selecting ____________.
personal protective equipment
The manufacturers name, trademark, or other descriptive marking by which the organization responsible for the product can be identified shall be __________________.
placed on all electrical equipment
Connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be made by means of ___________________.
pressure connectors, solder lugs, or splices to flexible leads (any of these)
Product testing, evaluation, and listing (product certification) shall be performed by ___________________.
recognized qualified electrical testing laboratories
NFPA 70E, Standard for Electrical Safety in the Workplace, provides guidance, such as determining the severity of potential exposure, planning safe work practices including establishing an electrically _________ work condition, arc-flash labeling, and selecting PPE.
safe
Wiring shall be installed so that the completed system will be free from _____________, other than as required or permitted elsewhere in the Code.
short circuits, ground faults, and connections to the earth (all of these)
Cables and conductors installed exposed on the surfaces of ceiling and sidewalls shall be secured by hardware including straps, staples, cable ties, hangers, or _______________ fittings designed and installed so as not to damage the cable.
similar
The minimum working space on a circuit for equipment operating at 120 volts-to-ground, with exposed live parts on one side and no live or grounded parts on the other side of the working space, is _____ ft.
3
Where equipment operating at 1,000V, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, the width of the working space shall be the width of the equipment enclosure or a minimum of _____ in., whichever is greater.
30
All switchboards, panelboards, and motor control centers shall be _____.
located in dedicated spaces and protected from damage
The required working space for access to live parts of equipment operating at 300 volts-to-ground, where there are exposed live parts on both sides of the workspace is _____.
4 ft
The area above the dedicated space required by 110.26(E)(1)(a) is permitted to contain foreign systems, provided protection is installed to avoid damage to the electrical equipment from condensation, leaks, or breaks in such foreign systems. True or False
True
Where equipment operating at 1,000V, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, the space in front of the enclosure shall comply with the depth requirements of Table 110.26(A)(1). True or False
True
Where electrical conductor material is not specified, the material and sizes given in the NEC shall apply to _________________ conductors.
copper
Equipment not _________ for outdoor use or identified for indoor use only such as "dry locations" or "indoor use only", shall be protected against damage from the wether during construction.
identified
Tightening torque values for terminal connections shall be as indicated on equipment or in installed instructions provided by the manufacturer. An approved means shall be used to achieve the _______________ torque value.
indicated
In judging equipment for approval, considerations such as _________ shall be evaluated.
mechanical strength, wire-bending space, and arcing effects (all of these)
Reconditioned equipment shall be marked with the _____________________ by which the organization responsible for reconditioning the electrical equipment can be identified, along with the date of the reconditioning.
name, trademark, or other descriptive marking (any of these)
On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or busbar having the higher phase voltage to ground shall be durable and permanently marked by an outer finish that is ___________ in color.
orange
The __________, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without extensive damage to the electrical equipment of the circuit.
overcurrent protective devices, total impedance, and equipment short-circuit current rating (all of these)
Fiber optic cables installed exposed to ______________, or other contaminants may result in an undetermined alteration of optical fiber cable properties.
paint or plaster, cleaners or abrasives, corrosive residues (any of these)
Fiber optic cables installed exposed to _____, or other contaminants may result in an undetermined alteration of optical fiber cable properties.
paint or plaster, cleaners or abrasives, or corrosive residues (any of these)
Internal parts of electrical equipment, including busbars, wiring terminals, insulators, and other surfaces, shall not be damaged or contaminated by foreign materials such as _____________________ or corrosive residues.
paint, plaster, cleaners, abrasives (any of these)
When modification to the electrical installation occur that affect the maximum available fault current at the service, the maximum available fault current shall be verified or ___________ as necessary to ensure the service equipment rating are sufficient for the maximum available fault current at the line terminals of the equipment.
recalculated
All _________ shall be covered with an insulation equivalent to that of the conductors or with an identified insulating device.
splices, joints, and free ends of conductors (all of these)
Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so ______________.
the purpose is evident
