Restrictions on types of conduits used for installing service, sub panel, emergency service panel.
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1)Restrictions on types of conduits used for installing service, sub panel, emergency service panel.
2Requirements for underground or overhead services.
3Type of protection requirements for raceways containing conductors (i.e.conductor sizes).
4Temperature correction factors associated with installation. 8. Voltagedropconsiderations
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- Define an equipment grounding conductor.1. Which of the following statements about equipment grounding conductors is true?A. Unacceptable equipment grounding conductors include conduit, tubing, and cable armor.B. They must be capable of withstanding the higher level of ground-fault current to perform their safety function.C. They increase voltages above ground potential on conductors and equipment enclosures during normal operation.D. When they're far from their associated circuit conductors, impedance values are kept as low as possible during ground-faultconditions.7.B. The size of a grounding electrode conductor for a service or separately derived system is generally basedon the size of the largestA. ungrounded supply conductor.B. equipment grounding conductor.C. grounded electrode.D. bonding jumper.7.C. Which of the following statements about bonding is true?A. The joint or termination must offer opposition in the circuit for effective electrical connections.B. Effective bonding keeps impedance high if a fault should occur.C. The entire electrical safety circuit is only as good as its strongest bonded link.D. Bonding connections must endure high levels of fault current until overcurrent protective devices can operate.
- c.1. Which of the following is one of the three essential functions of an equipment grounding conductor?A. Provide an arc-fault current pathB. Establish groundingC. Establish bondingD. Ensure the system is groundedc.2. What's another name for the three-point method of Earth resistance testing?A. Fall-of-potentialB. Line surgeC. Spatial shieldingD. Leakage current c.3. If the National Electrical Code provides a requirement to ground equipment, it generally implies thatthere will be a direct connection to the Earth of a connection through a/anA. grounding electrode conductor.B. equipment grounding conductor.C. equipotential bonding conductor.D. bonding conductor.1. _______ is not considered an effective ground-fault current path. a) Ground b) Equipment grounding conductors c) Equipment bonding jumpers d) Grounded conductors 2.Which of the following is not a conductor in the grounding and bonding scheme for an ungrounded system? a) Grounding electrode conductor for grounding equipment enclosures and conductive parts b) Equipment grounding conductor c) Bonding conductors or jumper d) System grounded conductor3. With respect to conductor insulation, describe the following location ratings: a. Dry b. Damp c. Wet
- Count the neutral conductor of a 4-wire, 3-phase, wye-connected circuit when the major portion of the load is electric discharge lighting (fluorescent, mercury vapor, high-pressure sodium, etc.), data processing, and other loads where the neutral conductor carries a. grounding b. traveler C. d. current. third harmonic unbalanced conductors to overheat but often overlooked is the possibility ofA? Conductor is defined in NEC 240.2 as a conductor, other than a service conductor, having overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are not taps. A. Faulted b. Tap c. Magnetic d. Copper-likeThe three bus-bar conductors in an outdoor sub-station are supplied by units of post insulators. Each unit consists of a stack of 3-pin insulators fixed one on the top of the other. The voltage across the lowest insulator is 8-45 kV and that across the next is 7-25 kV. Find the bus-bar voltage of the station.
- 9. Which grounding method is typically required of higher-voltage systems? A. Grounding through inductorsB. Grounding through a low amount of resistanceC. Grounding through a high-impedance device D. Grounding through surge arresters 10. Which term relates to the conductors connected to the output side of a separately derived system? A. Neutral conductorB. Transformer secondary conductorC. System conductor D. Derived phased conductor 11. If there's no service disconnect at a remotely supplied building, then the grounding electrode conductor and the equipment grounding conductor can be bonded together at a A. junction box.B. structural steel location. C. grounding electrode rod. D. water line. 12. In a DC system, the bonding jumper between the negative of the supply and ground is normally made at the source or at the A. first disconnecting means. B. first device on the supply. C. end of the DC line.D. entrance to the building. 13. Which of the following is a common raceway…A set of conductors is used to supply residential unit with a total load current of 60 A at a single-phase supply voltage of 230 V. What would be the minimum size of the conductor to be used to achieve at least 5% voltage drop? The total conductor length is 300 ft. ..2.a. What's defined as an assembly consisting of a service raceway, guy wires or braces, service head, andany fittings necessary for the termination and support of overhead service conductors?A. Drip loopB. Service lateralC. Service dropD. Service mast 2.b. What's likely to happen when connected parallel conductors are different lengths?A. An NEC violationB. Misidentification of conductor cablesC. An uneven distribution of currentD. Conductor termination
