Journeyman Electrician Exam

Electric signs and outline lighting systems must be _______ or more above areas accessible to vehicles unless protected physical damage.

14 Feet Sign or outline lighting system equipment shall be at least 4.3m (14FT) above areas accessible to vehicles unless protected from physical damage.

What is the minimum rating allowed for 120/240 volt, single-phase service equipment for a mobile home?

100 amperes Mobile home service equipment shall be rated at not less than 100 amperes at 120/240 volts, and provisions shall be made for connecting a mobile home feeder assembly by a permanent wiring method. Power outlets used as mobile home service equipment shall also be permitted to contain receptacles rated up to 50 amperes with appropriate overcurrent protection. 50 ampere receptacles shall conform to the configuration shown in figure 550.10(C)

What is the minimum separation for overhead communications wires and cables at any point in the span from supply service-drops of up to 750 volts?

12 Inches supply service drops and sets of overhead service conductors of 0 to 750 volts running above and parallel to communications service drops shall have a minimum separation of 300mm (12 in.) at any point in the span, including the point of and at their attachment to the building, provided that the undergrounded conductors are insulated and that a clearance of not less than 1.0m (40 in.) is maintained between the two services at the pole.

Where branch-circuit conductors supply one or more units of information technology equipment, they must have an ampacity of at least_________ percent of the total load that is connected.

125% The branch-circuit conductors supplying one or more units of information technology equipment shall have an ampacity not less than 125% of the total connected load.

What is the minimum percentage of the maximum current rating for PV system overcurrent devices, as calculated in 690.8(A)?

125% (1) Not less than 125% of the maximum currents calculated in 690.8(A).

If the prime mover for an emergency system is an internal-combustion engine, it is required to have on-premises fuel storage that will give at least how many hours of system operation at full-demand?

2 Hours Where internal combustion engines are used as the prime mover, a non-site supply shall be provided with an on-premises fuel supply sufficient for not less than 2 hours' full-demand operation of the system. Where power is needed for the operation of the fuel transfer pumps to deliver fuel transfer pumps to deliver fuel to a generator set day tank, this pump shall be connected to the emergency power system.

What is the minimum allowable trade size intermediate metal conduit (IMC) required to contain a total of ten (10) copper THW conductors in a 20ft run, five (5) size 1 AWG and five (5) size 3 AWG? *(Pg. 70-684)

2-1/2 Inches size 1 AWG THW=.1901 sq. in. x 5=.9505 sq. in. size 3 AWG THW=.1134 SQ. IN. x 5=.537 sq. in. total=1.5175 sq. in. *NOTE: A trade size 2-1/2 in. IMC with an allowable 40% fill of 2.054 sq. in. should be selected.

The area around motor fuel dispensing pumps at a service station is considered a hazardous location. How far horizontally from the enclosure of the outdoor motor fuel dispensing pumps does this extend?

20 Feet Table 514.3(B)(1) shall be applied where Class 1 liquids are stored, handled, or dispensed and shall be used to delineate and classify motor fuel dispensing facilities and commercial garages as defined in Article 511.

If an equipotential bonding grid is required to be installed in the deck around a permanently installed swimming pool, what is the minimum horizontal distance for it to be beyond the inside walls of the pool?

3 Feet The perimeter surface to be bonded shall be considered to extend for 1m (3FT) horizontally beyond the inside walls of the pool and shall include unpaved surfaces and other types of paving. Perimeter surfaces separated from the pool by a permanent wall or building 1.5 m (5FT) in height or more shall require equipotential bonding only on the pool side of the permanent wall or building.

What is the minimum rating for single receptacle share power for boats?

30 amperes Shore power for boats shall be provided by single receptacles rated not less than 30 amperes.

If more than 2 conductors are used in a tube of EMT conduit, the total interior area that can be filled is no more than ______ percent. *(Pg. 70-680)

40%

For a fixed or stationary electric sign installed in a fountain, the disconnecting means must be a least how far horizontally from the inside wall of the fountain?

5 Feet A fixed or stationary electric sign installed within a fountain shall be not less than 1.5m (5FT) inside the fountain measured from the outside edges of the fountain.

Unless it is necessary to supply pool equipment, underground wiring is not allowed under a pool or in an area less than _______ft. horizontally from the inside wall of the pool.

5 Feet All electric pool water heaters shall have the heating elements subdivided into loads not exceeding 48 amperes and protected at not over 60 amperes. The ampacity of the branch-circuit conductors and the rating or setting of overcurrent protective devices shall not be less than 125% of the total nameplate-related load.

Given the following information, what is the maximum approximate distance a single-phase, 240-volt, 42-ampere load can be located from a panelboard? *copper conductors - K = 12.9 *size 8 AWG THWN/THHN conductors are used *limit voltage drop to 3% *Chapter 9 tables, table 8 conductor properties (pg. 70-689)

50 feet Distance formula 1st. find allowable VD - 240volts x 3% = 7.2volts D=CM x VD D=16,510 x 7.2=118,872=109.7feet 2 x K X I 2 X 12.9 X 42

A bonding jumper not smaller than ________ AWG copper or equivalent must be connected between the radio and TV equipment grounding electrode and the power grounding electrode system when they are separate.

6 AWG A bonding jumper not smaller than 6 AWG copper or equivalent shall be connected between the radio & TV equipment grounding and the power grounding electrode system at the building or structure served where separate electrodes are used.

Generally, receptacles are required to be ________ft. or more from the inside walls of a pool.

6 Feet Other receptacles shall be not less than 1.83m (6FT) from the inside walls of a pool.

Where K=12.9, what is the approximate voltage-drop on a circuit where an 80-ampere, 240-volt, single-phase load is supplied with size 3 AWG copper conductors with THWN insulation, and placed 200 feet from a panelboard? *Chapter 9 tables, table 8 conductor properties (pg. 70-689)

7.84 volts voltage-drop formula VD=2KID VD=2 x 12.9 x 80amps x 200ft. =7.84 CM 52.620 CM

What is the minimum number of hospital grade receptacles required for each patient bed location in general care areas of hospitals, disregarding exceptions?

8 Each patient bed location shall be provided with a minimum of 8 receptacles. They shall be permitted to be of the single, duplex, or quadruplex type or any combination of the 3. All receptacles shall be listed "hospital grade" and shall be so identified. The grounding terminal of each receptacle shall be connected to an insulated copper equipment grounding conductor sized in accordance with table 250. 122.

Temporary electric power and lighting installations for holiday decorative lighting and similar purposes is allowed for a maximum of:

90 Days Temporary electric power and lighting installations shall be permitted for a period not to exceed 90 days for holiday decorative lighting and similar purposes.

What does the abbreviation A.F.F. represent?

Above Finished Floor

On construction sites, receptacles must not be installed on the same______________________ as temporary lighting.

Branch circuit All receptacles shall be of the grounding type. Unless installed in a continuous metal raceway that qualifies as an equipment grounding conductor in accordance with 250.118 or a continuous in accordance with 250.118, all branch circuits shall include a separate equipment grounding conductor, and all receptacles shall be electrically connected to the equipment grounding conductor(s). Receptacles on construction sites shall not be installed on any branch circuit that supplies temporary lighting.

Which class of hazardous locations are the ones with combustible liquid-produced vapors, or flammable liquid-produced vapors that may be present in the air in sufficient quantities to be an ignitable or explosive mixture?

Class 1 Class 1 locations are those in which flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures. Class 1 locations shall include those specified in 500.5(B)(1) and (B)(2).

True or False: Receptacles in health care facilities that have isolated grounding terminals as described in 250.146(D) are allowed in the vicinity of patient care areas.

False An isolated grounding receptacle shall not be installed within a patient care vicinity. [99:6.3.2.2 7.1(B)]

All grounded dc PV arrays shall have direct-current_______________________ provided to reduce fire hazards, and such must meet requirements of 690.5(a) through (c).

Ground-fault protection DC PV arrays shall be provided with dc ground-fault protection meeting the requirements of 690.41(B)(1) and (2) to reduce fire hazards.

In a PV system, a _______________ is a device meant to change direct-current input to alternating-current output.

Inverter Equipment that is used to change voltage level or waveform, or both, of electrical energy. Commonly, an inverter [also known as a power conditioning unit (PCU) or power conversion system(PCS)] is a device that changes dc input to an ac output. Inverters may also function as battery charges that use alternating current from another source and convert it into direct current for charging batteries.

The term for the circuit(S) between modules and from modules in a PV system to the common connection point(s) of the direct-current system is:

Photovoltaic source circuit Circuits between modules and from modules to the common connection point(s) of the dc system.

For wet-niche underwater pool luminaires, which conduit is allowed to enclose the conductors?

Rigid metal, intermediate metal, liquidtight flexible nonmetallic, or rigid nonmetallic. Conduit shall be installed from the forming shall to a junction box or other enclosure conforming to the requirement in 680.24. Conduit shall be rigid metal, intermediate metal, liquidtight flexible nonmetallic, or rigid nonmetallic.

Emergency power systems are intended to automatically supply power and/or illumination that is essential for __________________ and are legally required and classed as emergency by any governmental agency having jurisdiction.

Safety to human life Those systems legally required and classed as emergency by municipal, state, federal, or other codes, or by any governmental agency having jurisdiction. These systems are intended to automatically supply illumination, power, or both, to designated areas and equipment in the event of failure of the normal supply or in the event of accident to elements of system intended to supply or in the event of accident to elements of a system intended to supply, distribute, and control power and illumination essential for safety to human life.

Fire alarm circuits must be identified at all junction and terminal locations so that prevention of unintentional signals on the fire alarm system circuits during:

Testing and servicing of other systems Fire alarm circuits shall be identified at terminal and junction locations in a manner that helps to prevent unintentional signals on fir alarm system circuit(s) during testing and servicing of other systems

Essential electrical systems for hospitals are comprised of which branches?

The life safety, equipment, and the critical Essential electrical systems for hospitals shall be comprised of three separate branches capable of supplying a limited amount of lighting and power service that is considered essential for life safety and effective hospital operation during the time the normal electrical service is interrupted for any reason. The three branches are safety, critical, and equipment.

True of False: Raceways must not be used to support Class 2 of Class 3 cables

True Class 2 or Class 3 circuit conductors shall not be strapped, taped, or attached by any means to the exterior of any conduit or other raceway as a means of support. These conductors shall be permitted to be installed as permitted by 300.11(C)(2)

When are Class 1 circuit conductor and power-supply conductors are allowed to be in the same cable, enclosure, or raceway?

When both have a functional association with equipment Class 1 circuits and power-supply circuits shall be permitted to occupy the same cable, enclosure, or raceway only where the equipment powered is functionally associated.

The disconnecting means for electric signs or outline lighting systems must be visible and ______________________ of any part of the sign display.

Within sight. The disconnecting means shall be within sight of the sign or outline lighting system that it controls. Where the disconnecting means is out of the line of sight from any section that is able to energized, the disconnecting means shall be lockable in accordance with 110.25. A permanent field-applied marking identifying the location of the disconnecting means shall be applied to the sign in a location visible during servicing. The warning label shall comply with 110.21(B)

A legally required standby system must have rating and capacity sufficient for how much of the loads expected to operate at the same time on the standby system?

100% of the loads A legally required standby system shall have adequate capacity and rating for the supply of all equipment intended to be operated at one time. Legally required standby system equipment shall be suitable for the maximum available fault current at its terminals.

How far must the separation be between any light, power, or Class 1 conductors or radio & TV conductors, and underground antenna conductors for radio & TV receiving equipment?

12 inches underground conductors shall be separated at least 300mm (12 in.) from conductors of any light or power circuits or Class 1 circuits.

How much space is required between the wall and exposed metallic conduit or metallic panelboard in indoor areas such as canneries, dairy processing facilities or laundries where walls are frequently washed?

14 Inch A permanent label for the PV power source indicating the information specified in (1) through (3) shall be provided by the installer at dc PV system disconnecting means and at each dc equipment disconnecting means required by 690.15. Where a disconnecting means has more than one dc PV power source, the values in 690.53 (1) through (3) shall be specified for each source.

From the inside walls of an indoor installed spa or hot tub to the wall switches, what is the minimum distance?

5 Feet Switches shall be located at least 1.5m (5FT), measured horizontally, from the inside walls of the spa or hot tub.

Switching devices must be _________ ft. or more horizontally from the inside walls of a pool unless they are separated by a solid fence, wall, or another permanent barrier. A switch listed as being acceptable for use inside this distance is allowed.

5 Feet Switching devices shall be located at least 1.5m (5FT) horizontally from the inside walls of a pool unless separated from the pool by a solid fence, wall, or other permanent barrier. Alternatively, a switch that is listed as being acceptable for use within 1.5m (5FT) shall be permitted.

Receptacle providing power for swimming pool recirculating pump motors must be GFCI protected, grounded, and must be at least how far from the inside walls of the pool?

6 Feet Receptacles that provide power for water-pump motors or for other loads directly related to the circulation and sanitation system shall be located at least 1.83 (6FT) from the inside walls of the pool. These receptacles shall have GFCI protection and be of the grounding type.

What is the maximum cross-sectional value that conduit nipples under 24 inches long may be filled? *(pg. 70-678)

60% (4) Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60% of their total cross-sectional area, and 310.15(B)(3)(a) adjustment factors need not apply to this condition

What is the smallest size grounding conductor allowed for grounding the structural reinforcing steel of a swimming pool?

8 AWG The parts specified in 680.26(B)(1) through (B)(7) shall be bonded together using solid copper conductors, insulated covered, or bare, not smaller than 8 AWG or with rigid metal conduit of brass or other identified corrosion-resistant metal. Connections to bonded parts shall be made in accordance with 250.8. An 8 AWG or larger solid copper bonding conductor provided to reduce voltage gradients in the pool area shall not be required to be extended or attached to remote panelboards, service equipment, or electrodes.

What is the minimum clearance for communications wires and cables above all points of roofs above which they pass?

8 feet communications wires and cables shall have a vertical clearance of not less than 2.5m (8ft.) from all points of roofs above which they pass

The NEC allows Class 1 control-circuit conductors and motor branch-circuits to use the same raceway, as long as the control circuit conductors:

Are functionally associated with the motor system Class 1 circuits and power-supply circuits shall be permitted to occupy the same cable, enclosure, or raceway only where the equipment powered is functionally associated.

What is the correct term for a mechanically integrated assembly of PV modules or panels with support structure, foundation, tracker, and other components as required to form a dc power-producing unit?

Array A mechanically integrated assembly of module(s) or panel(s) with a support structure and foundation, tracker, and other components, as required, to form a dc or ac power-producing unit.

Which Class location is hazardous because of the presence of materials producing combustible flyings, or having easily ignitable fibers present, but where they are not expected to be in sufficient quantities to create an ignitable mixture?

Class 3 Class 3 locations are those that are hazardous because of the presence of easily ignitable fibers or where materials producing combustible flyings are handled, manufactured, or used, but in which such fibers/flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures. Class 3 locations shall include those specified in 500.5(D)(1) and (D)(2).

What is present at Class 2 locations that make them hazardous?

Combustible dust Class 2 locations are those that are hazardous because of the presence of combustible dust. Class 2 locations shall include those specified in 500.5(C)(1) and (C)(2).

GFCI protection for personnel is required to be provided in commercial garages on all 15A and 20A, 125V receptacles that are installed where which of the following is used?

Electrical diagnostic equipment, electrical hand tools, and portable lighting equipment All 125-volt, single-phase, 15- and 20-ampere receptacles installed in areas where electrical diagnostic equipment, electrical hand tools, or portable lighting equipment are to be used shall have ground-fault circuit-interrupter protection for personnel.

For each commercial building and occupancy that is accessible to pedestrians, there must be at least one outlet provided in an accessible location at the ____________ to every tenant space, for the use of an outline or sign lighting system.

Entrance Each commercial building and each commercial occupancy accessible to pedestrians shall be provided with at least one outlet in an accessible location at each entrance to each tenant space for sign or outline lighting system use. The outlet(s) shall be supplied by a branch circuit related at least 20 amperes that supplies no other load. Services hallways or corridors shall not be considered accessible to pedestrians.

True or False: It is permissible to attach, strap, or tape power-limited fire alarm cables to the exterior of a conduit or raceway.

False Power-limited fire alarm circuit conductors shall not be strapped, taped, or attached by any means to the exterior of any conduit or other raceway as a means of support.

True or False: The raceway fill limitations detailed in 300.17 will apply to coaxial cables.

False The raceway fill requirements of chapters 3 & 9 shall not apply to coaxial cables.

Receptacles providing power for water-pump motors and other loads directly related to water circulation and sanitation of a pool must be 6 ft. or more from the inside walls, and:

Have GFCI protection and be of the grounding type. Receptacles that provide power for water-pump motors or for other loads directly related to the circulation and sanitation system shall be located at least 1.83m (6FT) from the inside walls of the pool. These receptacles shall have GFCI protection and be of the grounding type.

Unless otherwise permitted, communications cables and wires must be separated at least 2 in. from which circuit conductors?

Power, lighting, or Class 1 Communications wires and cables shall be separated at least 50mm (2in.) from conductors of any electric light, power, Class 1, non-power-limited fire alarm, or medium-power network-powered broadband communications circuits.

When can conductors of Class 2 and Class 3 circuits be placed in the same cable, enclosure, raceway or similar fitting as electric light or power conductors or conductors of Class 1 circuits?

Separated by a barrier Class 2 and Class 3 circuits shall be permitted to be installed together with the conductors of electric light, power, Class 1, non-power-limited fire alarm and medium power network-powered broadband communications circuits where they are separated by a barrier

True or False: It is permissible to use a metal pole supporting a sign cabinet or sign system to enclose the supply conductors.

True Metal or nonmetallic poles used to support signs shall be permitted to enclose supply conductors, provided the poles and conductors are installed in accordance with 410.30(B)

True of False: If fire alarm cable is abandoned, the accessible portions must be removed

True The accessible portion of abandoned fire alarm cables shall be removed. Where bales are identified for future use with a tag, the tag shall be sufficient durability to withstand the environment involved.

The abbreviation TYP represents:

Typical