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electrical installations: intro to industrial wiring > lesson 3: electrical standards and codes > Flashcards

lesson 3: electrical standards and codes Flashcards

1
Q

documentation that is used to determine the proper method for electrical equipment installation in the field is categorized as what

A

standards and codes

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2
Q

what term indicates that an electrical equipment has been constructed and tested so that moisture will not enter the equipment

A

Watertight

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3
Q

who ensures that the electrical installation process is performed within proper safety and code requirements

A

AHJ (authority having jurisdiction)

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4
Q

NEMA standards are typically used in installations for sizing what

A

Motor starters

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5
Q

what can result in a large magnitude current flow in the ground path

A

Ground fault

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6
Q

the width of working space in front of the electrical equipment must be either that of the equipment, or ___’, whichever is greater

A

2 1/2’

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7
Q

NETA is an acronym for what

A

InterNational electrical testing association

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8
Q

an ANSI approved standard is developed based on input from various experts from applicable ___?

A

Industries

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9
Q

energized components that operate at ___v or more must be guarded against accidental contact

A

50v

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10
Q

what are used throughout the NEC to explain information that is contained in the various articles

A

Fine print notes

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11
Q

a ___ installation is an installation that the AHJ has reviewed, including conductors, equipment, and installation, and concluded to be acceptable

a. approved
b. labeled
c. acceptable
d. listed

A

approved

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12
Q

the IEEE produces how many standards

A

1100

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13
Q

an official description for equipment that has been constructed, protected, or treated so that rain does not interfere with the successful operation of the equipment under specified test conditions

A

Rainproof

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14
Q

A ___ is an accepted reference or practice

a. standard
b. code
c. listing
d. method

A

Standard

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15
Q

for 151v to 600v equipment under a grounded condition, the minimum working space clearance requirement is how many feet

A

3 1/2’

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16
Q

In the NEC, exceptions are permitted instead of the main rule when____

A

all provisions of the exception are met

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17
Q

to assist in the proper application of the NEC, terms that are used in two or more articles, are defined where

A

NEC article 100 (definitions)

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18
Q

If a location is normally dry but is temporarily subject to moisture, it can be classified as what type of location

A

dry

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19
Q

the final approval for the conductors and equipment installed must be given by who

A

AHJ (authority having jurisdiction)

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20
Q

what is a sustained discharge for electricity across a gap in a circuit or between electrodes

A

an arc

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21
Q

what is provided for an installation that protects electrical equipment

A

dedicated equipment space

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22
Q

the minimum clearance depths range from ____ to ____ for systems operating above 75 kv

A

3’ to 12’

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23
Q

as with labeling, ___of a product certifies that the equipment has been evaluated by a testing agency suitable for the AHJ

A

listing

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24
Q

an excessive amount of current present as the result of little or no resistance between conductors, is called what

A

short circuit

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25
Q

the NEC requires that a minimum length of ___” of free conductor be provided at each outlet for splices and terminations

A

6”

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26
Q

defective equipment, overloaded equipment, or too many loads on one circuit can cause what

A

an overload

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27
Q

what is the case or housing that surrounds an apparatus/equipment called

A

an enclosure

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28
Q

motor starters are sized by the classification “___”

A

NEMA sized starter

29
Q

overcurrents are caused by, overloads, short circuits and what else

A

ground fault

30
Q

most jurisdictions adopt the ____ as the model building code for their jurisdiction

A

IBC (international building code)

31
Q

This national organization focuses on the interpretation of the NEC and teaches safe installation and use of electricity

A

IAEI (international association of electrical inspectors)

32
Q

___ is the organization, office, or individual who is responsible for approving the equipment and materials used for electrical wiring installations

A

AHJ ( authority having jurisdiction)

33
Q

who’s purpose is it to practice safeguarding persons and property from the hazards arising from the use of electricity

A

the NEC

34
Q

this type of voltage has a value assigned to a circuit or system to designate its voltage class

A

nominal

35
Q

what chapter of the NEC applies to communication systems

A

chapter 8

36
Q

the ____ are standards developed by NECA in partnership with other industry organizations

A

NEIS (national electrical installation standards)

37
Q

where in the NEC book would you look to find/determine the maximum number of conductors that can be installed in a raceway

A

Annex c: tables

38
Q

measuring most voltages in commercial and industrial buildings requires the use of a category ____ test instrument as a minimum

A

CAT III (3)

39
Q

in order to become an enforceable law, ____ must be adopted by a jurisdiction such as a local county, parish, or state authority

A

code

40
Q

where it has been adopted, the ____ applies to all types of structures, EXCEPT for single and two family dwellings, which are covered by a different code

A

IBC (international building code)

41
Q

the official description for equipment that has been constructed, protected, pr treated so that exposure will not allow the entrance of water during a beating rain under specified test conditions

A

Raintight

42
Q

what is installed to prevent personnel from accidentally contacting energized parts or to protect equipment from physical harm

A

an enclosure

43
Q

this type of equipment converts electrical energy, into a useful form of energy, such as motion, heat, or light

A

utilization equipment

44
Q

T or F
premises wiring is only installed in permanent systems

A

False
premises wiring is installed in BOTH temporary and permanent systems

note: premises wiring DOES NOT include internal wiring to equipment such as motors, motor control centers, and appliances

45
Q

T or F
rather than using the latest version, some municipalities require compliance with an earlier version of the NEC

A

True

46
Q

T or F
NEMA publishes over 800 standards for the electrical industry

A

False
NEMA publishes 500 standards

47
Q

T or F
electrical codes can be amended by a particular jurisdiction such as a state or municipality

A

True

48
Q

T or F
OSHA is a suitable testing agency

A

False
recognized testing agencies are as follows:

UL(underwriters laboratories inc) - being the most recognized

MET laboratories inc.

Intertek

FM GLobal (Factory Mutual)

and

CSA (Canadian Standards Association)

49
Q

T or F
ANSI develops electrical standards and oversees the standards writing and approval process

A

False
ANSI does NOT develop electrical standards BUT does oversee the standard writing and approval process

50
Q

T or F
NEC requirements typically do not appear on the prints used for electrical installations

A

True

51
Q

T or F
The NFPA 5000 and I-codes are updated every 5 years

A

False
they are updated every 3 years

52
Q

T or F
The higher the AWG value, the greater the cross sectional area and the heavier the conductor

A

False
the SMALLER the number the greater cross sectional area and heavier the conductor is

ex: a 10g wire cross section is 5.26mm squared VS a 14 gauge wire cross section is 2.08mm squared

53
Q

T or F
permises wiring does not include internal wiring to equipment such as motors, motor control centers, and appliances

A

True

54
Q

T or F
underground installations and those in direct contact with the earth are classified as damp locations

A

False
such installations are classified as wet locations- wet locations are subject to water or other liquids

damp locations are subject to moderate degrees of moisture(like basements indoors), generally out of the weather but can be outdoors if the location is partially covered

55
Q

T or F
per the AHJ, visual imperfections of an installation can result in failure of a final inspection and require rework

A

True
main criteria that the AHJ reviews when making an approval are:

  1. conformance to the requirements of the NEC and any other applicable local building codes and standards
  2. quality and suitability of equipment installed (ex: no significant dents or damage that may affect the structure or function of equipment)
  3. professionalism of electrical work performed , emphasizing on NEC’s phrase “neat and workmanlike manner” (ex: are conduit runs straight, are openings in boxes plugged, conductors properly racked for future access etc.)
56
Q

T or F
Electrician licensing requirements for the NEC vary, depending on each states’ governing body

A

True

57
Q

T or F
a standard is typically an enforceable law

A

False
only when adopted can a code be an enforceable law

58
Q

T or F
because most standards are not readily accessible on a jobsite, working knowledge of applicable standards is necessary when performing installations

A

True
working knowledge includes, knowledge of which standards are available, information they contain, and publisher information so that they can be obtained if necessary

obtaining all applicable codes and standards for a particular installation is not necessary, but may need to be occasionally obtained for supplemental information

59
Q

T or F
a conductor with insulation rated for dry and damp locations cannot be placed in a wet location even if it is inside of a conduit listed for wet locations

A

True
all conductors, raceways, supporting equipment etc. must all be listed for whichever location it is to be installed in

60
Q

T or F
The IBC (I-codes, International building code) is a code administered by the IEC (international electrotechnical commission)

A

False
the IBC is maintained by the international code council (ICC). The ICC is a family of 15 related building codes (I-codes), such as the international plumbers code(IPC) and the international mechanical code(IMC) as examples

61
Q

T or F
plumbing or ventilation duct work is permitted in dedicated electrical spaces

A

False
there can be NO foreign systems that are not associated with the electrical equipment, and cannot be violated by any other installations

HOWEVER, there is one exception, suspended ceilings are allowed within the 6’ above electrical equipment, and foreign systems(plumbing, ventilation etc.) are allowed above the 6’ dedicated equipment space but they must have a leak protection apparatus to prevent leakage or moisture from dripping on electrical equipment.

62
Q

T or F
Disconnecting means identification is placed on equipment before the installation is completed

A

False
identification is performed after the equipment installation is complete.

identification MUST be durable enough to withstand the environment that the installation is exposed to.

63
Q

what are at least 10 requirements AHJ looks for when inspecting a job site for “Neat and workmanlike manner”

A
  1. conduit bends meet NEC requirements
  2. conduit runs are plumb, level, true, and not kinked
  3. conduit is supported within the specified distance from a box (within 3’ from a box)
  4. connectors are securely fastened
  5. covers are properly secured
  6. installation surfaces are free of paint, plaster, and other contaminates
  7. conduit offset bends are made as required (Bends in a single run cannot exceed 360 degrees before a pull point is installed)
  8. proper sized boxes are securely mounted and level
  9. proper sized conduit and conductors are installed (conductor fill rate in conduit cannot exceed 40%)
  10. Unused openings in boxes are plugged
64
Q

what is the “flash hazard boundary” when referring to arc flash protection warning tags

A

it is the distance from arc required to limit skin temperature to a curable burn

65
Q

what does it mean on an arc flash protection warning tag if you see “3 cal/cm(squared) flash hazard at 18””

A

3 cal/cm(2) is the heat energy at 18” from an arc

66
Q

what does the “limited approach” mean on a arc flash protection warning tag. ex. 36 inch limited approach

A

the specified distance that an unqualified person can be to the arc flash hazard.

the only exception to this is if the unqualified person has on the appropriate PPE and is also under the direct supervision of a qualified person.

67
Q

as an example; what does “12 inch restricted approach- 500v class 00 gloves” mean on an arc flash protection warning tag

A

12 inches is the skin protection boundary, and the rated PPE required

68
Q

what would “480 VAC shock hazard when door is open” mean on an arc flash protection warning label

A

it is the shock potential

69
Q

where might the equipment name on an arc flash protection warning label, be

A

at the bottom

electrical installations: intro to industrial wiring (4 decks)

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