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Questions and Answers

Under what hazardous locations class and division is a job that contains an abnormal amount of concentrated lead paint dust?

  • Class 1 Division 1
  • Class 2 Division 1
  • Class 2 Division 2 (correct)
  • Class 3 Division 1

    • 3/0AL wire is rated for:

  • 100 Amps
  • 175 Amps (correct)
  • 200 Amps
  • 600 Amps

    • How many pounds can a lighting box support?

  • 50 lbs. (correct)
  • 70 lbs.
  • 80 lbs.
  • 100 lbs.

    • As per Title 24, how many outside lights are permitted before requiring the use of photosensors to operate the lights?

    <p>10 or more</p> Signup and view all the answers

    There are 2 workers inside of a confined space, how many workers need to be at the entrance?

    <p>At least 1</p> Signup and view all the answers

    How many 12-gauge THHN wires can fit in ¾” EMT conduit?

    <p>16</p> Signup and view all the answers

    A 45,000-watt primary source with a 208/120-volt 3-phase system operates at what amperage?

    <p>125 Amps</p> Signup and view all the answers

    In a residential installation, what is the maximum battery voltage that can be put in series?

    <p>240V</p> Signup and view all the answers

    How frequently should flexible conduit be strapped?

    <p>4.5’</p> Signup and view all the answers

    A manual transfer switch is most often used for:

    <p>A backup generator</p> Signup and view all the answers

    30A load PVC buried in concrete should be at a depth of:

    <p>12 inches</p> Signup and view all the answers

    Submerged swimming pool lights that are bottom-mounted (facing upward) must have:

    <p>The lens guarded to prevent contact</p> Signup and view all the answers

    When installing solar on a roof, what is the consideration that should be taken?

    <p>Hardware and sealant used</p> Signup and view all the answers

    How are fluorescents in drop ceilings installed?

    <p>Attach to ceiling tile right above the light fixture</p> Signup and view all the answers

    The client calls the electrician and complains that some of the lights don’t work. When the electrician arrives, he finds that the panelboard is overheated, what is the most likely cause?

    <p>The wires were too small</p> Signup and view all the answers

    Which of the following applies to solar panels, metal frames, and metal mounting equipment on a roof-mounted PV system?

    <p>They must be bonded and grounded</p> Signup and view all the answers

    What is required if the voltage exceeds 600V?

    <p>Warning sign</p> Signup and view all the answers

    A main panel feeds a subpanel; what must be done?

    <p>Run a ground from the main panel</p> Signup and view all the answers

    To pull 300 feet of wire inside of conduit, what special tool/method is required?

    <p>Use lubricant oil</p> Signup and view all the answers

    How can the proper size wire for a 3-phase motor be found?

    <p>Check the label</p> Signup and view all the answers

    Motors and controllers for electrically operated pool covers must be:

    <p>A or B</p> Signup and view all the answers

    Conduit runs from the interior to the exterior of a house. What is the best way to protect the interior wires from moisture?

    <p>Use special putty paste</p> Signup and view all the answers

    What is the main disadvantage of using an interlock device inside a panel?

    <p>It doesn’t notify you that the city power is on</p> Signup and view all the answers

    When climbing a ladder to reach your work area, what height are you required to be tied-off?

    <p>7.5 feet above the ground</p> Signup and view all the answers

    When installing batteries in a residential setting, when should there be a protective cover over a battery preventing harm from live parts?

    <p>Always</p> Signup and view all the answers

    If a generator was installed and it wasn’t approved, what should the contractor do?

    <p>Contractor should call the inspector and seek approval</p> Signup and view all the answers

    Which of the following terminals does not belong in a three-way switch circuit?

    <p>Neutral</p> Signup and view all the answers

    A contractor notices that the as-built plans are NOT up to code. Who should be contacted?

    <p>Plan architect</p> Signup and view all the answers

    The current photovoltaic system has a total of 21 panels. Each rail supports 3 panels and each rail requires 3 jacks. If the customer asks you to add 15 panels to the system, what is the total number of jacks required?

    <p>36</p> Signup and view all the answers

    If there are 3 wires in an EV charging coupler; 1 long and 2 short, why is one of the prongs longer?

    <p>Easy to recognize grounding and non-grounding wires</p> Signup and view all the answers

    What is the minimum conductor size required for a 50-amp disconnect?

    <p>8 AWG</p> Signup and view all the answers

    An automatic transfer switch is most often used for:

    <p>A standby generator</p> Signup and view all the answers

    Who gives the permit to enter a manhole (confined area)?

    <p>Entry supervisor</p> Signup and view all the answers

    After asbestos work is done, where should worker clothes be bagged for disposal?

    <p>Equipment room</p> Signup and view all the answers

    What is the maximum length of a cord for a standalone spa or hot tub?

    <p>15'</p> Signup and view all the answers

    What is the minimum branch circuit rating for a household range or cooking appliances?

    <p>40A</p> Signup and view all the answers

    A 90-year-old home has masonry walls which must be adapted to make a hole for conduit penetration. What tool is best suited for the task?

    <p>Hammer drill with a carbide bit</p> Signup and view all the answers

    How many single pole breakers can we put in a 200 amp subpanel?

    <p>42</p> Signup and view all the answers

    How should a nick in the insulation of a Romex cable be addressed?

    <p>Add a splice box</p> Signup and view all the answers

    After a residential solar system was installed, the customer complains that phone messages are recorded with disturbances. What is the likely cause?

    <p>Charge controller</p> Signup and view all the answers

    What is the allowable setback gap of a newly installed flush-mounted outlet box?

    <p>1/4&quot;</p> Signup and view all the answers

    The client asks for a stove to be 6” away from the countertop, which of the following applies?

    <p>This is allowed</p> Signup and view all the answers

    You brought a 4-kW generator and plugged it into the receiving outlet of a house. What do you do to ground it?

    <p>Bond to the frame of the generator</p> Signup and view all the answers

    How do you correct voltage from leading current?

    <p>Capacitor</p> Signup and view all the answers

    What type of light may not be installed inside a closet?

    <p>Incandescent fixtures with open or partially enclosed lamps</p> Signup and view all the answers

    In California, how should the contractor perform unit load calculations?

    <p>By floor area</p> Signup and view all the answers

    What is the maximum length of cord or cable length for an electric vehicle charging system?

    <p>25 feet</p> Signup and view all the answers

    How should incandescent lights be installed?

    <p>12” surface mounted and 6” when recessed</p> Signup and view all the answers

    An electrician installs two 3-way switches and one 4-way switch, how many locations can he control a light fixture from?

    <p>3</p> Signup and view all the answers

    If an employee is electrocuted, what is the first thing you should do?

    <p>Make sure they are no longer connected and remove them from the source</p> Signup and view all the answers

    What type of fluorescent lights are used in a commercial freezer?

    <p>Vapor proof</p> Signup and view all the answers

    How many watts are in a 120V circuit with 60-ohm resistance?

    <p>240 watts</p> Signup and view all the answers

    When working on or near energized equipment, what should be considered?

    <p>De-energize the circuit</p> Signup and view all the answers

    What should you do if no lock-out device is available when installing a sub-panel?

    <p>Disconnect wires feeding panel and label it</p> Signup and view all the answers

    Where should you connect the transformer's ground?

    <p>At the first point of entry</p> Signup and view all the answers

    Balconies, decks, and porches that are attached to the dwelling shall have at least 1 receptacle accessible from the balcony, deck, or porch. What is the maximum height for this receptacle if installed above the walking surface of a porch, deck, or balcony?

    <p>6-1/2 feet</p> Signup and view all the answers

    Upon switching and/or turning on a food disposal appliance, the light fixtures begin to flicker. What is the most likely cause?

    <p>Voltage drop</p> Signup and view all the answers

    An overcurrent device should always be wired in:

    <p>Series to what its protecting</p> Signup and view all the answers

    Allowed receptacle from the residential door?

    <p>Within 6 feet</p> Signup and view all the answers

    Roof flashing on a solar installation is used for which of the following?

    <p>Waterproofing</p> Signup and view all the answers

    When transporting electrical equipment with employees in the vehicle:

    <p>Store the equipment in a secure box</p> Signup and view all the answers

    Electrician arrives at a jobsite, what sign should they put up?

    <p>Warning</p> Signup and view all the answers

    What is the minimum distance between clothes and a lamp within a clothes closet?

    <p>6 inches</p> Signup and view all the answers

    How do you fix a disturbance between telephone lines and power conductors?

    <p>Separate the lines with a minimum of 4 inches</p> Signup and view all the answers

    How many small appliance branch circuits shall supply the kitchen, pantry, dining room, or similar area of a dwelling unit?

    <p>2 or more branch circuits</p> Signup and view all the answers

    What is the minimum distance for a GFCI to be installed from a pool wall?

    <p>6'</p> Signup and view all the answers

    When PVC conduit extends from a pool light’s forming shell to the junction box, the 8 AWG bonding jumper termination shall be:

    <p>Covered in a potting compound</p> Signup and view all the answers

    How would you connect a backup generator to a main panel?

    <p>Install a transfer switch</p> Signup and view all the answers

    In a 3-way switch, which wire is used to control lights at two locations?

    <p>Traveler</p> Signup and view all the answers

    What should you do if the electrical extension cord is damaged?

    <p>Make repairs or remove from the job site</p> Signup and view all the answers

    What are the leg colors of a 208-120 volt three-phase electrical system?

    <p>Black, red, and blue</p> Signup and view all the answers

    A homeowner calls an electrician to troubleshoot a circuit. The circuit has a total of 6 outlets, but when the homeowner plugs in a portable heater, 5 out of the 6 stop working. What is the most likely cause?

    <p>Loose connection</p> Signup and view all the answers

    A subcontractor noticed on the walk-through that the main panel is undersized and was approved by the inspector. Who should be contacted to resolve the issue?

    <p>Contractor</p> Signup and view all the answers

    How would a 5/16 lag bolt be installed into a joist to support electrical equipment?

    <p>Drill a 3/16” pilot hole</p> Signup and view all the answers

    What is used to calculate for horsepower?

    <p>0.746 kW</p> Signup and view all the answers

    If working in an area above energized equipment what is required?

    <p>Rubber mat</p> Signup and view all the answers

    After a flood, what percentage of erosion must be contained prior to returning to work?

    <p>100%</p> Signup and view all the answers

    Who controls loud noises on the jobsite?

    <p>Contractor</p> Signup and view all the answers

    What are the leg colors of a 480-277 volt three-phase electrical system?

    <p>Brown, orange, and yellow</p> Signup and view all the answers

    How does a generator transfer power?

    <p>ATS</p> Signup and view all the answers

    What is the maximum allowable height of a scaffold in light trade?

    <p>20 feet</p> Signup and view all the answers

    What should an electrician consider if a chandelier is replaced with a fan?

    <p>J-box should be listed for fan use</p> Signup and view all the answers

    What does a megohmmeter measure?

    <p>Insulation resistance</p> Signup and view all the answers

    If installing wiring through bored holes or notches of a stud, and when steel plates are required for protection, what is the minimum thickness of the steel plate?

    <p>1/16”</p> Signup and view all the answers

    Which of the following regulations applies to service–entrance conductors that are supplying service to a building structure?

    <p>The conductors may not pass through the interior of another building or structure</p> Signup and view all the answers

    A warehouse has lights installed 25’ above the ground. What kind of lights would experience cycling?

    <p>High-intensity bulbs</p> Signup and view all the answers

    A branch circuit supplying a submersible fountain pump must:

    <p>Operate at 300 volts (or less) and be GFCI-protected</p> Signup and view all the answers

    What size copper wire connects the grounding electrode conductor or bonding jumper to a grounding rod, pipe, or plate?

    <p>6 AWG</p> Signup and view all the answers

    If a 200-ampere service rating is selected for a dwelling, what is the minimum size aluminum service conductor?

    <p>4/0</p> Signup and view all the answers

    How many wires run from a main panel to a sub-panel?

    <p>4</p> Signup and view all the answers

    What is common during finish wiring tasks?

    <p>Splices will get nicks</p> Signup and view all the answers

    When should “Warning-High-Voltage” signs be placed?

    <p>1,000 volts or above</p> Signup and view all the answers

    A continuous white or natural gray covering can only be used on which type of conductors:

    <p>Grounded neutral</p> Signup and view all the answers

    You need to install 520 photovoltaic panels. If 2 workers can install 2 panels every 6 minutes, at a salary of $25.20 per hour, what is the total labor cost?

    <p>$1,310.40</p> Signup and view all the answers

    An older home has an outlet which is missing a ground wire. The electrician must:

    <p>Install a GFCI receptacle</p> Signup and view all the answers

    Notching a nonbearing wall stud should not exceed ____ of the stud depth.

    <p>40%</p> Signup and view all the answers

    What environmental considerations are needed for solar installations?

    <p>Sun</p> Signup and view all the answers

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