Wisconsin Contactor Training 18 hour 2022
Chapter 3 is arranged (as is the entire NEC) to begin with the most general or central provisions then move towards the more specialized or most peripheral. This can be seen in the following arrangement of Chapter 3 Articles covering these topics in the following order:
1) General - 2) Conductors - 3) Enclosures - 4) Outlets - 5) Cables - 6) Conduit - 7) Raceways
The new Section 695.15 for the 2017 NEC [Surge Protection] was provoked by the findings of a 2014 study, "Data Assessment for Electrical Surge Protective Devices" that found the following percentage of fire pump controllers damages by voltage surges:
12%
What size generators are covered in the 2017 NEC's Section 445.20 [Ground-Fault Circuit-Interrupter Protection for Receptacles on ...Smaller Portable Generators]?
15 kW or smaller
Which of the following is the correct answer to the following calculation for conductor ampacity: [145.25 amps (divided by) .91=]
159.6 amperes
Under Article 110, Part II 1,000 Volts, Nominal, or Less 110.26(A) [Working Space] the 2017 NEC now requires the width of working space be no less than the width of the equipment enclosure or the following measurement, whichever is greater:
30 inches
How many public inputs to suggest changes were received during the revision process for the 2017 NEC?
4012
At what power rating does a PV system qualify as a "Large-Scale PV Electric Supply Station", governed by Article 691?
5,000 kW
The PV systems regulated under the new 2017 NEC Article 691 are capable of generating at least the following minimum number of kilowatts:
5,000 kW
Article 551; Parks Part VI; Section 551.71 of the 2017 NEC [Recreational Vehicle Parks; Type Receptacles Provided] lists three typical amperages found in RVs. What is the highest of the three amperages referenced in this Section?
50 Amps
Subsection 422.16(B)(2) of the 2017 NEC [Flexible Cords; Built-in Dishwashers and Trash Compactors] changes the maximum length of the cord for a built-in dishwasher from 4 feet to the following maximum length:
6 1/2 feet
According to the new item #5 in Subsection 230.24(B) [Vertical Clearance for Overhead Service Conductors] what is the required clearance above train tracks for overhead service conductors?
7.5 m (24½ ft) over tracks of railroads
Subsection 310.15(B)(3)(c) of the 2017 NEC [Ampacities for Conductors Rated 0-2000 Volts; Adjustment Factors; Raceways and Cables Exposed to Sunlight on Rooftops] requires an adjustment to account for exposure to sunlight unless the cables or raceways are the following distance above the roof:
7/8 inch
According to Section 312.8 in the 2017 NEC [Switch and Overcurrent Device Enclosures], what is the maximum percentage of a wiring space cross-section's total area that may be taken up by all conductors, splices, and taps?
75 percent
Section 680.74 [Bonding] in Part VII [Hydromassage Bathtubs] of Article 680 in the 2017 requires equipotential bonding to be accomplished through the use of a solid copper bonding jumper, insulated, covered, or bare, sized as follows:
8 AWG or larger
According to OSHA statistics mentioned in the discussion of 590.6 in the 2017 NEC [Ground-Fault Protection for Personnel], what percentage of construction site workplace fatalities in 2014 were due to electrocution?
8.5%
The 2017 NEC adds a new definition for Wireless Power Transfer Equipment (WPTE) for EV Charging under Section 625.2. Under this definition, what are the components of WPTE?
A charger power converter and primary pad, either designed as separate units or contained within one enclosure
The 2017 NEC makes a substantial revision to Part VII of Article 690 [Solar PV Systems; Connection to Other Sources]. What is the nature of that revision?
All of the provisions in Part VII of Article 690 are deleted and replaced with a reference (in the new Section 690.59) to the new Article 705 in the 2017 NEC
The following wiring methods are included in the provisions of the revised Section 840.48 (Unlisted Wires and Cables Entering Buildings):
All of these are correct
Chapter 7 [Special Conditions] includes Articles on widely varied areas. What do the various Articles have in common that justifies their inclusion in Chapter 7?
All the Articles in Chapter 7 address wiring installations that are separate in whole or in part from the primary electrical wiring system for the structure
Subsection 706.30(A) of the 2017 NEC [Part III. Electrochemical Energy Storage Systems (ESS); Installation of Batteries; Dwelling Units' restricts the size of an ESS for dwelling units the following voltage (with an Exception where access is limited to the ESS)
An ESS for dwelling units cannot exceed 100 volts between conductors or to ground (with an Exception based on access)
Article 250 of the 2017 NEC covers "Grounding and Bonding". How is the purpose of this Article described in the video introducing Articles 240 and 250?
Article 250 (Grounding and Bonding) covers how to avoid excessive voltage in one part of the installation that creates the potential for damaging flows of current for which the system is not designed
What is the name given to the new Article added to Chapter 6 in the 2017 NEC?
Article 691 - Large-Scale Photovoltaic Electric Supply Stations
Which of the following is NOT a new Article introduced in the 2017 NEC?
Article 692
The 2017 NEC adds a new Functional Grounded PV System definition to Article 690. Is a functional grounded PV system basically an "ungrounded" system by another name?
As generally installed, a functional grounded PV system is only ungrounded when the inverter is not operating; when it is operating, the PV system in question becomes referenced to ground through ac service conductors
According to the discussion of changes to signage in Section 555.24 in the 2017 NEC Article that governs marinas, what amount is the least measurement of current that can be considered a significant drowning risk?
As little as 10 mA of current through the human body can result in diminished muscular control sufficient to result in drowning
Subsection 210.71(B)(2) of the 2017 NEC [Meeting Rooms; Receptacle Outlets Required; Floor Receptacle Outlets] now requires that a meeting room 12 feet wide or wider and at least 215 sq. ft. must have at least one floor receptacle outlet per 215 sq. ft., set at the following minimum distance from any fixed wall
At least 6 feet from any fixed wall
Which of the following chapters has general applications for the organization of the NEC?
Chapter 1-4
The NEC defines three classes of hazardous locations. What are the defining characteristics for a Class I hazardous location?
Class I locations include areas that are hazardous due to the presence of airborne flammable gases or vapors
Which of the following topics is NOT covered in the new 2017 NEC Article 706 on Energy Storage Systems?
DC microgrids
Chapter 1 is composed of only two Articles. What are the titles of these two Articles?
Definitions and requirements for electrical installation
Subsection 501.10(B)(1) of the 2017 NEC [Wiring Methods for Class I, Division 2] lists three acceptable wiring methods. Which of the following is NOT acceptable under this Subsection?
Electrical Metallic Tubing (EMT)
True or False: The definition of "Readily Accessible" was revised in the 2017 NEC so that either tools or a key can be required and still meet the definition of readily accessible
False; the revised version allowed the use of a key but not a need to use tools in order to be defined as readily accessible
The 2017 NEC adopts the category system first adopted by the 2012 Health Care Facilities Code that will eventually replace terms such as "critical care" or "support space" with numbered categories. How many categories are adopted
Four (Categories 1-4)
The different functions of GFCI and AFCI were discussed when covering the 2017 NEC changes to Subsection 406.4 (D)(4) [General Installation Requirements; AFCI Protection]. What are those differences?
GFCI are intended to prevent injury to personnel from shocks; ACFI are intended to prevent fires caused by arc-faults
Subsection 645.5(E) of the 2017 NEC [Supply Circuits and Interconnecting Cables; Under Raised Floors] imposes the following two conditions on installation of IT cables under floors:
IT cables may be installed under floorboards where the area under the floor is accessible and openings minimize the entrance of debris beneath the floor
Which of the following is NOT an industrial process covered in the new Article 425 for the 2017 NEC [Fixed Resistance and Electrode Industrial Process Heating Equipment]?
Induction and dielectric heating equipment
Article 727 of the 2017 NEC governs "Type ITC" wiring methods. What does ITC stand for?
Instrumentation Tray Cable
According to the changes for the 2017 NEC to Subsection 600.4 (B) [Markings; Signs with a Retrofitted Illumination System], when is it permissible to replace LED bulbs in a retrofitted sign with fluorescent bulbs?
It is not permitted to replace LED lamps in a retrofitted sign, under Section 600.4, and a warning must be visible at the point of replacement that with use of fluorescent bulbs is not permitted
Example D7 (Sizing of Service Conductors for Dwellings) adds the "Former Table 310.15(B)(7)" to the 2017 NEC. What is meant by the term "Former" when applied in this manner?
It was formerly part of enforceable code; it is no longer enforceable code but is placed in the Annex for informational purposes only
Section 240.67 [Cartridge Fuses and Fuseholders; Arc Energy Reduction] sets a new maximum fuse clearing time for larger ampere fuses [unless other conditions are met]. The new provision takes effect on the following date:
January 1, 2020
The new Section 480.3 for the 2017 requires that "Storage batteries and battery management equipment shall be listed," but specifies that this requirement "shall not apply" to the following:
Lead-acid batteries
Which form of popularly available natural gas is heavier than air, causing it to congregate near the ground and create a substantial explosive hazard?
Liquefied Petroleum Gas (LP-Gas)
The video mentions new requirements "for some of the new and innovative stationary battery types". What is the nature of these new requirements?
Listing requirements
According to the NEC Manual of Style, a definition must be moved to Article 100 if the definition is being applied to the following number of Articles:
More than one
Section 366.20 of the 2017 NEC [Conductors Connected in Parallel] references Subsection 310.10(H) for rules on installing single conductor cables in parallel. Which of the following is NOT required by the rules in 310.10(H)?
Parallel conductors must be separated from one another by no less than 8mm (0.315 inches)
Note 9 of the informational Notes to Tables concerns the following type of calculation:
Percentage of conduit or tubing fill area for conductors
Subsection 550.13(B) of the 2017 requires GFCI protection for manufactured home receptacle outlets in the following locations:
Receptacles in bathroom luminaires
Article 440 covers electrical connections to air conditioning and what other type of equipment?
Refrigerating equipment
What wiring methods are permitted pursuant to Subsection 680.14(B) [Swimming Pools, Fountains, and Similar Installations; Corrosive Environment; Wiring Methods]?
Rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride conduit, or reinforced thermosetting resin conduit
The discussion in this lesson on changes to 250.94(A)&(B) [Intersystem Bonding Terminations] describes an IBT functioning: "When one system is raised above ground potential, the second system rises to the same potential, and no voltage exists between the two grounding systems." What is this primary purpose of an IBT (as described) intended to prevent?
Shock and fire hazards
The 2017 NEC amends Subsection 250.52(B) [Not Permitted for Use as Grounding Electrodes] to add the following, so that it may no longer be used as a grounding electrode:
Structure and structural reinforcing steel of in-ground swimming pool conductive shells or perimeter surfaces
The new Section 645.18 for the 2017 NEC adds the following requirement for critical operations data systems:
Surge protection
Subsection 517.34(B) in the 2017 NEC [Critical Branch - Switching] changes the provisions for switches on the critical branch that are designed to control task illumination, as follows:
The 2017 NEC now permits switches to be utilized for task lighting when fed from a critical branch
What is required with regard to a grounding electrode conductor (GEC) where the PV system is not functionally grounded under Subsection 690.47(A) of the 2017 NEC [Grounding Electrode System; Buildings or Structures Supporting a PV Array]?
The PV system must be directly connected to the building's GEC or to an auxiliary GEC dedicated to the PV system
What are the new provisions with regard to the cord in the main text of Subsection 410.62(C)(1) of the 2017 NEC [Cord-Connected Lampholders and Luminaires; Electric-Discharge and LED Luminaires; Cord-Connected Installation]?
The cord must be visible over its entire length (except at terminations) and not subject to strain or physical damage
The new sentence added to Subsection 210.5(C)(1)(b) of the 2017 NEC [Identification for Branch Circuits; Posting of Identification Means] requires the following:
The label shall be of sufficient durability to withstand the environment involved and shall not be handwritten
Article 250 Part X [Grounding of Systems and Circuits of over 1000 Volts] of the 2017 NEC, Section 250.187 [Impedance Grounded Neutral Systems], requires neutral conductor to be insulated for the maximum neutral voltage. This Section adds an "Informational Note" clarifying that the maximum neutral voltage in a three-phase wye system may be calculated as follows:
The maximum neutral voltage in a three-phase wye system is 57.7 percent of the phase-to-phase voltage
The 2017 NEC renames Article 555, as follows:
The new title for Article 555 in the 2017 NEC is "Marinas, Boatyards, and Commercial and Noncommercial Docking Facilities"
Which of the following is a new requirement for the 2017 NEC in 406.6(D) [Receptacle Faceplate (Cover Plates) with Integral Night Light and/or USB Charger]?
The night light and/or LED circuitry must be integral with the flush device cover plate
The Exception to Subsection 404.2(C) of the 2017 NEC [Switches Controlling Lighting Loads] Limits the number of electronic lighting control switches on a single branch circuit, as follows:
The number of electronic lighting control switches on a branch circuit shall not exceed 5
Section 312.8 in the 2017 NEC allows power monitoring equipment to share Switch and Overcurrent Device Enclosures under the following conditions:
The power monitoring equipment is listed for the purpose and does not cause the total material in the enclosure to exceed the cross-sectional limits
Under what terms do provisions from Chapters 1-7 apply to the Articles in Chapter 8?
The provisions of Chapters 1-7 apply only where specifically referenced within the Articles of Chapter 8
What revision is made to 770.49 in the 2017 NEC [Metallic Entrance Conduit Grounding]?
The terms rigid metal conduit (RMC) and intermediate metal conduit (IMC) are deleted and replaced with the term "metallic conduit"
Section 344.14 of the 2017 NEC [Dissimilar Metals] states that "Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action." How do galvanic action and cathodic reaction differ?
They don't - galvanic action and cathodic reaction are two terms for the same phenomenon
The new list item 5 in the 2017 NEC's Section 445.11 refers to "inverter-based generators, in lieu of the synchronous, subtransient, and transient reactance." What is an "inverter-based generator"?
They produce DC voltage that utilizes an inverter to create an end product of what is considered a cleaner AC voltage for use
The new Section 440.9 for the 2017 NEC reads: "Where multimotor and combination-load equipment is installed outdoors on a roof, an equipment grounding conductor of the wire type shall be installed in outdoor portions of metallic raceway systems that use non-threaded fittings." What is the reason for this requirement?
To avoid an interruption of the path for ground-fault return in the event of mechanical loosening or damage to non-threaded fittings
Where a micro-grid is utility-interactive (i.e., can backfeed voltage into the municipal grid), it must automatically disconnect if there is no current in the conductors to the utility grid. Why does the NEC require this automatic disconnection when no current is detected in the conductors to the municipal grid?
To avoid sending current into conductors shut down by the utility to allow maintenance to be performed on that section of the grid
Section 682.15 in the 2017 NEC [Natural and Artificially Made Bodies of Water; Ground-Fault Circuit-Interrupter (GFCI) Protection] adds the words "for personnel" to the requirement for GFCI protection for receptacles installed outdoors and in or on floating buildings. What is the purpose for adding the words "for personnel"?
To clarify that GFCI protection is only required where receptacles are accessible for use by persons
What is the intent of the revisions to Section 690.12 in the 2017 NEC [Rapid Shutdown of PV Systems on Buildings]
To insure that first responders will be provided sufficient signage and means to rapidly disconnect power-generating PV arrays
What is the minimum distance required by Section 770.44 of the 2017 NEC [Overhead (Aerial) Optical Fiber Cables] that must be maintained for the entire span between OFC and overhead service conductors?
Twelve inches
Section 511.8 of the 2017 NEC [Underground Wiring; Commercial Garages, Repair and Storage] allows an exception to using RMC or IMC if the PVC, RTRC, or HDPE conduit is buried under the following cover:
Two feet
Subsection 700.10(D) of the 2017 NEC [Wiring, Emergency System; Fire Protection] requires a fire rating for installed wiring equivalent to the following time period:
Two hours
Which additional cable type is added to the 2017 NEC's Subsection 590.4(B) [Temporary Installations; General; Feeders]?
Type SE
What is the title of Article 200 in the 2017 NEC?
Use and identification of grounded conductors
Section 358.10 of the 2017 NEC requires that supplementary protection be provided when installing aluminum EMT in the following corrosive environments:
When encased in concrete or in direct contact with the earth
When is standby power required (i.e., not optional)?
When serving emergency systems involving safety or danger to life and health
How do Sections within Article 517 [Health Care Facilities] indicate that they coordinate with a different NFPA standard?
With a bracketed reference that begins with the number "99."
Section 660.5 [Disconnecting Means for X-Ray Equipment] is revised for the 2017 NEC to ensure that means to disconnect x-ray equipment would not be inaccessible or hard-to-find where such a configuration is a safety risk. What is the scope of x-ray machines covered by this Section?
X-ray machines used in manufacturing and industrial processes, excluding any machines in medical or dental facilities
According to the discussion of Subsection 210.12(C) in this lesson [Arc-Fault Circuit-Interrupter Protection; Guest Rooms and Guest Suites], what is a recent improvement to the AFCI that allows for its wider applications without having excessive "phantom" trips?
new models of the AFCI sense arc "profiles" and only trip if the arc fits a dangerous profile
What is the required wording for mandatory signage pursuant to Subsection 110.26(B) - Clear Spaces?
there is no signage requirement
