NCCER 33108 Limited-Energy Cabling Practice Test

These questions are part of the practice quiz. Start practicing

• What does 'continuous bonding' imply for control circuits?
• When pulling an optical fiber cable, the pull line should be attached to which of the following?
• CATV is the abbreviation for which term?
• What is the purpose of a 'bend radius' guide or formula?
• Communication circuits are covered in NEC Article ___?
• EMI stands for what?
• When pulling optical fiber cable, which material can be used as the pull line?
• The minimum bend radius for outlet UTP cable must be at least _____ times the cable diameter.
• When comparing an AWG number to current carrying capacity ____?
• Prior to attempting a pull in all but very short runs, the wires should be _____
• What term describes wiring installed inside a building for power and communications?
• Power-limited fire alarm cable marked for risers?
• One way to avoid EMI problems is to terminate unused conductors at both ends.
• Drain wires in a shielded cable are used to ground which component?
• Red outer coating identifies which cable type?
• Which marking indicates suitability for general use in non-plenum spaces?
• Why is strain relief important at cable entry points?
• Ampacity is the maximum continuous current a conductor can carry without exceeding its temperature rating. Which term describes this property?
• Maintain at least how many inches between power cables and unshielded communications cables to minimize EMI?
• Steel plates are required to protect wires when holes are drilled less than how many inches from the edge of a stud?
• Which statement best supports shielding in noisy environments?
• The standard conductor material used in low-voltage cable is which?
• In shielded cables, why is the drain wire typically bonded to ground at the equipment end?
• A power-limited fire alarm cable that can be used in plenum is marked as_____?
• What is the term for a cable that connects the telecommunications room to the building entrance facility?
• In noisy environments, which type of cable best maintains signal integrity?
• Which electrical characteristic opposes the flow of alternating current?
• How does a shield drain wire function in shielded control cables?
• Largest AWG conductor for maximizing current capacity?
• What is the maximum rated pulling tension for Series 6 coaxial cable?
• The term community access television is abbreviated as?
• What is the proper order of operations when commissioning new limited-energy cabling in a panel?
• What is the typical use of a conduit body (LB, LL, LT) in low-voltage installations?
• In optical fiber, total internal reflection occurs at which interface?
• What sequence ensures safe maintenance when working with live conductors in limited-energy systems?
• The primary safety goal of limited-energy cabling is to minimize which hazards?
• In shielded cable, which wire is intentionally tied to ground to drain static or noise from the foil shield?
• In limited-energy circuits, which statement best distinguishes conductor gauge from cross-sectional area?
• What term describes unwanted electrical energy that can interfere with equipment or signals?
• For commercial premises wiring, how large a work-area square footage per floor requires a telecommunications room (TR)?
• How would you verify proper polarity of a two-wire control cable?
• A main bundle of cables that connects multiple points is commonly referred to as a
• Which cable type uses two or more twisted copper conductors?
• In which residential wiring configuration are tip and ring wires run in a circular configuration?
• After installation, which action should be taken regarding the cable runs?
• If a bend radius is too tight, what is a likely consequence?
• When pulling high-speed data cable, the pulling tension should not exceed how many foot-pounds?
• What is the electrical term for the opposition to the flow of alternating current?
• Which type of cable provides higher bandwidth and better protection against EMI than twisted-pair conductors?
• Loose-tube optical multi-fiber cable is normally used in which environment?
• The core of optical fiber carries the modulated light signals.
• Which device will probably be required when you are vertically pulling a heavy cable from the top down?
• What do you call a cable consisting of two or more twisted copper conductors?
• In a control panel, why is color-coding of wires important?
• Privately owned switching equipment that allows communication within a business and connected to common lines from one or more telephone company central offices is known as ______ equipment.
• The bandwidth limit for Category 7a UTP cables is up to 1000 MHz.
• What should a technician do if a conductor is damaged during installation?
• In enhanced shielded twisted-pairs (STP-A) cable, the _____ reduces low-frequency noise and provides immunity to other _____.
• What is the drain wire in shielded cables used for?
• Which cable serves as the backbone path between floors in a building?
• What is the purpose of labeling at terminations and along the run?
• When installing interior low-voltage cables, power-limited fire alarm cables can be within 1 inch of power cables if there is a permanently fixed barrier between them.
• For new construction, what do TIA standards provide guidelines for?
• What term describes a colored band, strip, or thread used to identify cables?
• On every cable pull, it is essential to have _____.
• What is the primary purpose of shielded cable in environments with EMI?
• How should you test insulation resistance of a bare limited-energy cable after installation?
• The reduction in signal strength as it travels along a transmission path is called what?
• Which of the following is a common nickname for the 10BASE-2 network standard?
• Limited-energy cabling is used for which types of systems?
• What steel mesh device is used to connect a cable to a pulling rope during installation?
• A cable marked CL2 is best described as which type of cable?
• Definition of limited-energy cabling.
• Floating the shield is a method used with shielded cable. Grounding is performed on which end of the shield?
• What is the primary function of the telecommunications room in a commercial installation?
• Which device is used to guide cables during pulling operations, acting as a pulley in a system?
• What is the purpose of using a mud ring in low-voltage rough-in?
• Define a grounding conductor and its role in limited-energy systems.
• The installation of optical fiber is covered in NEC Article ___?
• Which statement best defines pulling tension in a limited-energy cabling installation and how should it be controlled?
• The cord used in pulling systems to move cable through spaces is known as what?
• The tool that helps prevent jacket damage by keeping cables together as they enter a raceway is called a?
• A connecting cable with three conductors separated by insulators is commonly called a
• A large bundle of cables connecting points is called a?
• Use a _____ to prevent the cable from tangling while it is being pulled.
• Which practice helps minimize shock risk by ensuring a low-impedance path for fault current in a control system?
• What is 'shielded' vs 'drain' in shielded cables?
• What is the minimum bend radius for backbone cable expressed as a multiple of the cable diameter?
• Grade 2 residential service also provides for which type of services?
• What is required to ensure a clean, accurate drawing of a control cabling layout?
• After repairing a conductor, which option is the correct step before energizing again?
• For horizontal backbone cabling, the distance between pull points must not exceed how many degrees?
• What is the primary function of a barrier strip in control panel terminations?
• When grounding the shield of shielded cables, you should ground at which points?
• What term describes wiring that runs inside a building?
• PTFE/Teflon insulation is commonly used for which purpose in cables?
• How do you determine whether to use EMT or PVC for a given limited-energy installation?
• What is the difference between a terminal block and a barrier strip?
• As the final step in a cable pull, all cable runs must be properly _____
• The minimum grade of UTP cable acceptable for new telecommunication installation is category which?
• How do you calculate the approximate voltage drop in a limited-energy loop?
• Under what circumstances might shielded twisted pair (STP) be preferred over unshielded twisted pair (UTP)?
• Which device connects the pulling rope to the cable group and is used in pulling operations?
• The component used to support and carry the weight of a cable along a path is called?
• What is the maximum permissible pull distance between horizontal backbone pull points?
• According to the color code, the number of pairs of conductors in a cable that can be defined
• Which of the following is a typical drywall nail protection device used with low-voltage cabling?
• Swing clevis purpose during a pull?
• What is the purpose of lubrication when pulling cables, if allowed?
• Low-voltage cable typically contains conductors that have solid wire sizes ranging from which AWG?
• Which option describes Thinner (10 base 2)?
• Which device is specifically used to attach a cable to a pulling rope in the field?
• Which insulation material is commonly used for plenum-rated cable insulation?
• In residential telecom installation, what is the central distribution equipment called?
• A cylinder propelled through a conduit by the main fishing system is called a?
• Which of the following is not a good option for cable used in under carpet installations?
• PBX stands for which term?
• Why is lockout/tagout essential before working on limited-energy cabling?
• Which other insulation types are mentioned as suitable for limited-energy cabling?
• Which marking indicates suitability for plenum spaces?
• What is the purpose of using shielded cable in control and signaling applications?
• What is the function of a label or tag on a conductor near a device?
• The insulation most commonly used for non plenum cables is____.
• A multi-purpose communications wire or cable for general use except in plenums and risers is marked as____.
• Which NEC article governs limited-energy Class 2 and Class 3 circuits?
• Which cable type is most likely used for medium-powered, network-powered broadband communication in a vertical shaft space?
• Which feature helps maintain safety and reliability by ensuring quick restoration after maintenance?
• Where should steel plates be installed to protect wires when drilling holes near a stud?
• Which NEC article covers optical fiber installation?
• What is the primary method for eliminating EMI in most installations?
• In a data network where every device connects to a single central hub, which topology is used?
• What are common conduit types used with limited-energy cabling?
• A Category 7a UTP cable has a bandwidth up to what value?
• Which practice is most effective for identifying conductors entering a panel during commissioning?
• Describe a typical method for terminating conductors in a terminal block used for limited-energy circuits.
• What is a 'pull tape' and how is it used?
• The 10 base 2 cable specification for network cables is referred to as which term?
• What is the term for a colored band, strip, or thread used to identify cables?
• According to NEC, the voltage on non-power-limited circuits may not exceed?
• Which cable runs vertically between floors to connect backbone paths in a building?
• What is the flat steel wire or fiber cord that is pushed or pulled through a conduit called?
• What are the three circuit classifications typically covered under limited-energy cabling?
• Which action is performed first during commissioning of a panel's limited-energy cabling?
• Which of the following is not typically a source of EMI in low-voltage circuits?
• Which statement about CL2 cables is true?
• Which option lists the network cable specification commonly associated with 10BASE-2 in shorthand?
• Cross power cables at 90-degree angles when possible.
• Which outcome results from careful EMI routing and shielding practices?
• Which thermoplastic is most widely used for jacket material in cables?
• In STP-A cables, exterior braids reduce low-frequency noise and provide immunity to other radio-frequency interference.
• What is a common method for identifying conductors entering a device or panel?
• In a rope-pulling setup, which hardware is used to connect the pulling rope to the bundle?
• Which range of solid conductor sizes is typical for low-voltage cables?
• Which of the following are common field terminations for control cables?
• Which tool is commonly used to verify continuity of a control circuit before energizing?
• Which labeling information should be found near a device conductor for maintenance?
• What is the function of a pull box in limited-energy installations?
• Which item is NOT typically part of accurate as-built cabling documentation?
• What is the purpose of a permanently fixed barrier when routing power-limited fire alarm cables near power cables?
• When a hole is drilled near a stud edge, steel plates spanning the hole must be installed on the edge of the stud. Which option best describes this requirement?
• Ring color for first pair in four-pair UTP cable?
• What is the term for the loss of signal power, typically measured in decibels?
• Which network cable standard uses thick coaxial cable for 10 Mbps?
• Category 6A UTP bandwidth up to 500 MHz.
• For pulling cables into a conduit or duct, which type of rope is recommended?
• Red outer coating identifies which cable type?
• What is the NEC-specified maximum voltage for non-power-limited circuits?
• CATV is commonly used to refer to which of the following?
• Low-power broadband cables in raceways with optical fiber cables permitted option?
• Any hidden obstructions in the conduit can be detected before the pull by _____.
• Which equipment connects multiple internal lines to external lines within a business?
• What is installed to prevent cables from being damaged by drywall screws or nails?
• Single-mode optical fiber core diameter is normally which microns?
• What is the difference between a pull box and a junction box in limited-energy installations?
• Limited class 1 circuits are limited to a maximum of how many volts?
• Which metal form is used as the standard conductor material in low-voltage cable?
• When conduit is not used in new residential, low-voltage construction, cables can be pulled through the finished wall by using a _____.
• Which NEC article would you consult for the installation of Class 1, 2, and 3 circuits?
• What is the typical purpose of a control relay in a limited-energy circuit?
• When routing limited-energy conductors, what is the primary concern regarding bend radii?
• In a pulling setup, which component is used to connect the pulling rope to the bundle?
• The device used to connect the pulling rope to the cable group is called the?
• What is the minimum bend radius for outlet UTP cable expressed as a multiple of the diameter?
• Why is careful cable routing important in avoiding EMI and physical damage?
• The minimum cable grade acceptable for new data installations is category___.
• In optical fiber cable, the information-modulated light signal is carried by the _____.
• A pulley-like device used in cable pulls in both conduit and cable tray systems is called a?
• Name two common conductor insulation types suitable for limited-energy cabling.
• Which insulation material is commonly used on plenum-rated cable?
• What is the purpose of labeling conductors at both ends in a control panel?
• What is the recommended practice when pulling multiple cables through a conduit to prevent damage and kinks?
• Horizontal backbone cable pools should not exceed how many feet between pull points?
• When pulling projects in cable trays during horizontal runs, what device can make pulling easier?
• What is essential to every cable pull?
• CMX cables are used in residential dwellings.
• Coaxial cable provides what advantage over twisted-pair conductors?
• Swing clevis function during a pull?
• Which of the following describes a typical EMI source in low-voltage circuits?
• What is the function of a junction box in a terminal wiring path?
• Never use fish tape near or in what to avoid electric shock?
• Which statement best describes the effect of shielding on EMI?
• Which term is abbreviated as CATV?
• In optical fiber, a reflective boundary is created by the difference in purity between the core and the ____.
• Compared to a solid wire of the same gauge, stranded wire is ____ in diameter.
• Which AWG size carries the most current?
• A power fishing system is used primarily to blow or vacuum a ______ through a raceway system.
• What is the role of a terminal block in a limited-energy control circuit?
• The installation specifications for Class 1, 2, and 3 applications are located in NEC Article _____.
• Which statement describes the purpose of a test pull in conduit work?
• Each bedroom in a residence should have at least how many communication outlets?
• Category 6A UTP frequency capability?
• The act of stopping or slowing the movement of cable is called a?
• CATV stands for which of the following phrases?
• Which hardware component is commonly used to attach the pulling rope to the cable group in installations?
• What is the common name for the 10BASE-2 network standard?
• Which type of cable provides better protection against EMI?
• Cables listed and marked as CMX are used in_____.
• Which statement describes the difference between shielded twisted pair (STP) and unshielded twisted pair (UTP) in control cables?
• The term floating the ground means that?
• Which of the following statements about installing commercial cable is correct?
• The 10BASE-5 network cable specification is called?
• Which statement about using a fish tape near energized equipment is correct?
• Max power supply for power-limited circuits (Class 1)?
• For high-speed data cable, what is the maximum pulling tension per cable?
• When performing a voltage check, what must be done before touching conductors?
• How does conduit choice affect limited-energy cabling installation?
• Which cable marking is used in residential dwellings?
• What is the purpose of using a test point in a limited-energy cabling system?
• How should you document a newly installed limited-energy run in the as-built drawings?
• What is the recommended practice for terminating shielded cables?
• Which factors influence the ampacity of conductors in a limited-energy installation?
• Horizontal four-pair cable is normally run between which components?
• Compared with solid wire of the same gauge, stranded wire is typically ____.
• When documenting a newly installed limited-energy run, how should the as-built drawings be updated?
• Maximum voltage for power-limited Class 1 circuits?
• After completing a limited-energy cabling installation, which testing is typically performed?
• What is the recommended practice for securing cables in trays or conduits?
• What is the function of shielding in shielded cables?
• In commercial premises wiring, the telecommunications room is the junction between which two wiring segments?