Independent Electrical Contractors (IEC) First Year Practice Exam

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• GFCI protection is not typically required in which location?
• Which statement describes a 3-wire residential service?
• A breaker panel is permitted to be located ___
• Terminations of RG-6 cable are made using which connectors (jacks)?
• What are typical energy code considerations for lighting in kitchens and bathrooms?
• On a multiwire circuit with unequal loads, what happens if the neutral conductor becomes open?
• What is the purpose of a bonding jumper in electrical installations?
• Why are AFCI protections required in dwelling units and where are they typically applied?
• Voltage drop in branch circuits should typically be kept below what percentage?
• The neutral conductor carries ___ amps.
• The number conductor permitted in 80 PVC is specified in table
• The Standard for Electrical Safety in the Workplace requires that all electrical equipment operating at over ___ volts to ground be de-energized and locked out before anyone is permitted to work on or near the equipment.
• What is the temperature rating of THHN for wet locations?
• Which statement best defines the relationship between conductor ampacity and circuit ampacity?
• Which statement best describes the function of an AFCI?
• What is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that NEC requires to be installed near a permanently installed pool?
• In a multi-wire branch circuit, why does the neutral current not simply equal the sum of the two branch currents?
• Article ___ of the NEC is the article that gives requirements for swimming pool installations.
• In a MWBC with two hot legs on opposite phases carrying equal currents, the neutral current is:
• If the leads of the voltmeter are placed at T3 and T4 the meter will indicate
• In box fill calculations, how are grounding conductors counted?
• If the two hot conductors on a multi-wire branch circuit carry 7 A and 7 A respectively, the neutral current is:
• How do you determine the ampacity of a conductor using NEC tables and temperature ratings?
• What is the THHN temperature rating commonly used for dry locations?
• Which of the following best describes safe practices when working on electrical systems on a job site?
• What are the safe practices for working on live circuits when lockout/tagout is not possible in an emergency?
• What is the minimum required clear working space in front of a panelboard for safe maintenance, and what is the typical NEC reference?
• What is the minimum number of receptacles required in an unfinished basement?
• A 60 W light bulb operates on 120 V. What are the current and the resistance of the bulb at rated power?
• Are load centers typically available with bolt-on circuit breakers?
• Which color is typically used for a neutral conductor in the United States?
• For a 100-Amp, 120/240-V, 3W commercial service, ___ AWG copper THHN/THWN conductors are the smallest permitted for the ungrounded conductors.
• Which NEC annex is used to reference conduit fill calculations when all conductors are the same size?
• What is the primary function of a busbar in service equipment?
• If a portable generator provides power for frame-mounted receptacles only, what does the NEC require regarding a grounding electrode for the frame?
• What is the difference between grounding and bonding in electrical systems?
• To reduce voltage drop in a branch circuit, which action would be most effective?
• What best describes a short circuit and a common residential wiring cause?
• Which statement about bonding indoor spa metal parts is true?
• What is the required clearance around electrical service equipment and where is it specified?
• If the power used by the element connected at T3 & T4 is 0.3 kW, what is the total power for all four elements energized?
• When calculating residential service load, how many volt-amperes are allowed for each branch circuit serving laundry receptacles?
• Which standard requires de-energizing and lockout before work on electrical equipment above a threshold voltage?
• The described panel operates at which voltage and phase configuration?
• What is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that NEC requires to be installed near a permanently installed pool?
• Transfer switches use which device to prevent feedback between generator power and normal utility power?
• Which term best describes a service lateral running from the utility to the building?
• If connected to a metal water piping system, the grounding electrode conductor shall be connected at some point within the first __ of where it enters the building.
• Loads that do not operate at the same time are noncoincident loads. When calculating service load only the ___ of two noncoincident loads needs to be included.
• Where is the main service equipment typically located?
• A short length of EMT is run between two panels. The ampacity values for the conductors in this EMT need not be derated as long as the length of the EMT does not exceed how many inches?
• Home automation controllers that use radio frequency (RF) can do which of the following?
• An equipment grounding conductor (EGC) is the conductor that is ___.
• What is the correct procedure to identify a service conductor using a non-contact voltage tester?
• Which receptacles require GFCI protection in kitchens and bathrooms?
• What is a pull string or fish tape and when is it used?
• Do 240V circuits require a neutral conductor in all cases?
• Which statement describes how 240V residential circuits differ from 120V circuits?
• Which of the following is a 3/0 AWG conductor?
• What is the purpose of an arc fault circuit interrupter (AFCI) and what are common symptoms of arcing faults?
• What is the total resistance of two resistors in series with values 6 Ω and 3 Ω?
• In a parallel circuit with resistors 8 Ω and 4 Ω connected to a 120 V supply, what is the total current drawn from the source?
• Noncoincident loads refer to loads that do not operate at the same time.
• Which of the following is true about interrupting devices associated with pool equipment?
• Which protective device arrangement is required for MWBCs to ensure simultaneous disconnection?
• Pool side receptacles are rated at what voltage?
• Which statement best describes the neutral conductor in a typical electrical system?
• Which wiring method is typically used for interior dry locations?
• Which statement best describes TEK screws for EGC connections to metal boxes?
• Why is the grounding blade on a plug typically longer than the live blades?
• What is voltage drop and when should you be concerned about it in branch circuits?
• What must be ensured when wiring two hot conductors that share a neutral?
• If one circuit on a MWBC is disconnected, what happens to the neutral current?
• When the leads of a voltmeter are placed across T1 and T8, the reading will be:
• When installing Cat5 cable, pulling too hard can damage which part of the cable?
• RG-6 cable terminations are made using which type of connectors (jacks)?
• If a 60-watt lamp operates for 21 hours, the utility will bill for ___ kWh.
• The grounding blade on an attachment plug is ___ than the current-carrying conductor blades.
• What is the purpose of a mechanical interlock in a transfer switch?
• Which unit is used to measure energy consumption that is commonly used to calculate electricity costs?
• The service disconnect is typically located where?
• The neutral has been removed from the neutral bar in the circuit shown in the figure. the voltage dropped across lamp 2 is ___ volts
• The minimum size service disconnect for a single-family dwelling with a computed load of kVA is how many amperes?
• Why is it important to match amperage protection with conductor ampacity?
• What is the typical amperage requirement for small-appliance circuits in kitchens?
• On a multiwire branch circuit with unequal loads, which load is at greater risk of overheating if the neutral opens?
• Is it permitted to run normal power conductors and optional standby power conductors in the same raceway or enclosure?
• For residential service, the general-purpose lighting load is calculated at how many volt-amperes per square foot of area?
• The initial cost of metal halide luminaires is ___ than that of quartz.
• The load will be energized when the switches are in which condition
• When must a receptacle be installed on a dedicated circuit?
• Where is the service point located in the described system?
• Which wiring method is commonly used for exposed runs and requires physical protection?
• What are the typical steps for a standard electrical rough-in inspection?
• From NEC table 8 ch. 9 the overall diameter of a 1/0 bare stranded copper is ___ inches
• A 20-amp, 120-volt duplex convenience receptacle near a pool shall be located at least how many feet from the inside edge of the swimming pool?
• Which of the following is not an appropriate location for a breaker panel under typical NEC practice?
• During rough-in, what is a key consideration related to box fill?
• RF-based home automation controllers can do which of the following concerning walls and signals?
• When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ___.
• What is the purpose of a service meter and where is it located?
• General-purpose lighting load total for a 2,500 square foot area would be how many volt-amperes?
• The disconnect switch in the described setup is supplied by how many hot conductors from the breaker?
• An extension ladder should extend how many feet above the top of the building and be secured?
• A voltmeter reads 120 V between T3 and T4. This indicates that T3 and T4 have what phase relationship?
• A 250-watt lamp running 8 hours per day consumes how many kWh per day?
• The disconnect switch is fused with plug fuses and supplied from a 2-pole breaker in spaces 8-10 in the 277/480-volt, 3ø, 4-wire panel. Is this a code violation?
• What are the rules for securing NM-B cable and staples within 8 inches of a box and every 4.5 ft along the run?
• Which term best describes a service lateral that is installed underground?
• In a series circuit, which statement is true about voltage drops across resistors?
• Which NEC article deals with requirements for swimming pool installations?
• Receptacles that provide power for water pump motors located 6' and 10' from inside walls of the pool must meet which conditions?
• How does a multimeter measure resistance and continuity?
• Article ___ in the NEC covers grounding and bonding of electrical systems.
• Explain the purpose of bonding and where is a bonding jumper placed in a service or panel?
• Which statement correctly describes conductor color coding and the re-identification requirement when a white or gray conductor is used as a hot?
• Which statement correctly describes box fill calculation?
• Which statement best describes a multi-wire branch circuit?
• Which value could plausibly represent the neutral current in amps if given as a precise measurement of 2.13 amps?
• A GFCI is designed to detect ground faults and interrupt to prevent shock.
• How is the lighting power density (LPD) calculated for a room if you know the room area and the total wattage of lighting installed?
• For a 20 A circuit using 12 AWG copper conductors, what is the minimum required EGC size?
• What is the minimum equipment grounding conductor size for a residential circuit that uses 14 AWG copper on a 20 A circuit?
• Distinguish between series and parallel circuits with respect to current and voltage distribution.
• A disconnecting means for a swimming pool circulation pump must be installed in which location?
• What is the main difference between a device such as a GFCI and an AFCI?
• For a 125-amp, 120/240-V, 3W residential service, what is the smallest copper THHN/THWN conductor size permitted for underground conductors?
• Which term describes the boundary point between the utility’s service and the customer’s wiring?
• You have two 3-wire NM cables entering a box and one device (switch) installed. How many box fill units are required?
• In a multi-wire branch circuit where circuits 7 and 9 share a neutral, if circuit 7 draws 13 A and circuit 9 draws 16 A, what is the neutral current?
• What is the purpose of conduit bodies (K, L, T, etc.) and when are they required?
• The diameter of a 1/0 bare stranded copper conductor is approximately 0.372 inches. This data is found in which NEC reference?
• The conductors at point III in figure 130.101 are ___. The service point is located at the meter.
• In EMT, eleven #12, five #10, and six #6 THHN/THWN conductors will be installed in a run. What is the smallest trade size EMT you can use?
• To minimize conductor insulation damage and arcing during a ground fault or a short circuit, what should be minimized?
• Plug fuses can be used on which of the following voltage systems?
• Without exceptions, all metal parts of an indoor spa or hot tub must be bonded.
• Which Code reference specifies the type of disconnecting means that can be used on a multiwire branch circuit that feeds devices mounted on the same yoke?
• In amps, how much current will flow in the circuit conductor connected to terminal 13 on the 1-pole breaker?
• When installing audio/video/data cables, the cables should be installed in what manner?
• Which statement correctly describes NM-B conductors in wet locations?
• According to NEC 250.122, what is the minimum equipment grounding conductor size for a 15 A circuit using 14 AWG copper?
• If there are two laundry branch circuits, each 1,500 VA, the total laundry load is ___ VA.
• Is the statement 'Usually, load centers are not available with bolt-on circuit breakers' true?
• For pool-related receptacles located 6 to 10 feet from pool walls, what combination of protections is required?
• Which statement is true about the service disconnect and main disconnect?
• Circuit 13 is connected to the ___ busbar.
• If the two hot conductors on a MWBC carry 13 A and 16 A, the neutral current is:
• Which statement best describes AFCI protection?
• Self-tapping sheet metal screws (TEK screws) ___ permitted to be used to connect the equipment grounding conductor to a metal box.
• In NEC terms, how does a listed device differ from an assembled product?
• What is the purpose of a GFCI test button and how often should you test safety devices on a job site?
• How many kilowatts does a 100-amp residential service draw when fully loaded?
• How does an AFCI breaker detect arcing faults in a circuit?
• When determining the minimum size of a grounding electrode conductor, which table is used?
• What are the main features of a grounding electrode conductor (GEC) and typical materials used?
• In a split-wired duplex receptacle fed by a 12/3 cable with two 20 A breakers, what happens if the neutral is removed from the receptacle?
• If a short circuit occurs due to damaged insulation creating a low-resistance path, what is the main hazard if the fault is not addressed?
• In a parallel circuit with 12 V and resistors 6 Ω and 3 Ω in parallel, what is the total current from the source?
• What is the basic purpose of a service disconnect and where is it typically located?
• What are occupancy-based lighting controls?
• Which of the following is a unit of energy?
• In a circuit where the switches prevent energizing the load in any position, the correct energization condition is which option?
• In residential wiring, 120 V circuits usually power which loads?
• Which statement about the grounding electrode conductor (GEC) is correct?
• In a series circuit with resistors 6 Ω, 12 Ω, and 3 Ω connected to 120 V, what is the total current?
• GFCI protection is required in which of the following locations?
• If a voltmeter connected between T1 and T8 reads zero, which statement is true about the potential difference between T1 and T8?
• What is the monthly energy cost to operate a 250-watt high-pressure sodium lamp, given $0.15 per kWh, 8 hours per day, and 30 days in a month?
• ___ can be described as the point of demarcation between where the serving utility ends and the premises wiring begins.
• Using Ohm's Law, what is the current I when V = 120 V and R = 24 Ω?
• The NEC has limitations on where OCPDs, such as panelboard installations, can be installed due to the presence of combustible materials. These limitations are specified at ___
• Which statement best describes bonding in electrical systems?
• Which factor influences box fill calculations?
• When performing a voltage drop calculation for a branch circuit, which factors must you consider?