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Ch 2 Mike Holt Study Guide
d) any of these - The continuity of a grounded conductor shall not depend on a connection to ____. a. a metallic enclosure b. a raceway c. cable armor d. any of these 6 - An insulated grounded conductor __ AWG or smaller shall be identified by a continuous white or gray outer finish, or by three continuous white or gray stripes along its entire length on other than green insulation. wye-connected - A three-phase, 4-wire, ____________ power system used to supply power to nonlinear loads may necessitate that the power system design allow for the possibility of high harmonic currents on the neutral conductor. c) a and b - 120 V, single-phase, 15A and 20A brand circuits supplying outlets and devices installed in guest ____ of hotels and motels shall be protected by any of the means described in 210.12(A)(1) through (6). a. rooms b. suites c. a and b d. none of these 18 - Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets for dwelling unit wall spaces, unless they are located within __ in. of the wall. one- and two- family dwellings - The receptacle outlet required for indoor electrical service equipment shall not be required to be installed for ____ ___ ____ ______ __________. d. all of these - For the purposes of 210.71, examples of rooms that are not meeting rooms include ____.
a. auditoriums b. schoolrooms c. coffee shops d. all of these 5 - Where fixed multioutlet assemblies are used in other than dwelling unites or the guest rooms of hotels or motels, each ______ ft or fraction thereof of each separate and continuous length shall be considered as one outlet of no less than 180 VA where appliances are unlikely to be used simultaneously. 180 - For other than dwelling occupancies, banks, or office buildings, each receptacle outlet shall be calculated at not less than ____ VA. four - When sizing a feeder for the fixed appliance loads in dwelling units, a demand factor of 75 percent of the total nameplate ratings can be applied if there are ____ of more appliances fastened in place on the same feeder. Column A - To determine the feeder calculated load for ten 3 kW household cooking appliances, use ______ __ of Table 220.55. largest of - Where it is unlikely that two or more noncoincident loads will be used simultaneously, only the _______ __ the loads used at one time is required to be used in computing the total load to a feeder. 43 - A demand factor of __ percent applies to a multifamily dwelling with ten units if the optional calculation method is used. 18 in - If a set of 120/240 V overhead feeder conductors terminates at a through-the-roof raceway or approved support, with not more than 6 ft. of these conductors, 4 ft horizontally, passing over the roof overhand, the minimum clearance above the roof for these conductors is not les than __ __. 30A - For installations consisting of not more than two 2-wire brand circuits, the building disconnecting means shall have a rating of not less than ___.
1000A - Ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts-to-ground, but not exceeding 1000V phase-to-phase for each individual device used a a building or structure main disconnecting means rated _____ or more, unless specifically exempted. True - True or False: Single-pole breakers with identified handles ties can be used to protect each ungrounded conductor for line-to-line connected loads. c. a and b - Outside feeder tap conductors can be of unlimited length without overcurrent protection at the point they receive their supply if the tap conductors ____. a. are suitably protected from physical damage b. terminate at a single circuit breaker or a single set of fuses c. a and b d. none of these d. all of these - Overcurrent devices are not permitted to be located in the bathrooms of ____. a. dwelling units b. dormitories c. guest rooms or guest suites of hotels or motels d. all of these d. a and b - Grounded electrical systems shall be connected to earth in a manner that will ____. a. limit voltages due to lightning, line surges, or unintentional contact with higher-voltage lines b. stabilize the voltage-to-ground during normal operation c. facilitate overcurrent device operation in case of ground faults d. a and b c. a and b - Ungrounded alternating-current systems from 50V to 1000V or less that are not required to be grounded in accordance with 250.20(b) shall have ____. a. ground detectors installed for ac systems operating at not less than 120V and at 1000V or less
b. the ground detection sensing equipment connected as close as practicable to where the system receives its supply c. a and b d. ground fault protection for equipment d. a or b - Ungrounded alternating-current systems from 50V to less than 1000V shall be legibly marked "Caution: Ungrounded System - Operating ______ Volts Between Conductors" at _________ of the system, with sufficient durability to withstand the environment involved. a. the source b. the first disconnecting means c. every junction box d. a or b main bonding jumper - The grounded conductor of an alternating-current system operating at 1000V or less shall be routed with the ungrounded conductors and connected to each disconnecting means grounded conductor terminal or bus, which is then connected to the service disconnecting means enclosure via a ____ _______ ______ that is installed between the service neutral conductor and the serive disconnecting means enclosure. True - True or False: When supplying a grounded system at a separate building or structure, an equipment grounding conductor shall be run with the supply conductors and connected to the building or structure disconnecting means and the the grounding electrodes. d. all of these - High-impedance grounded neutral systems shall be permitted for three-phase ac systems of 480V to 1000V where ____. a. the conditions of maintenance and supervision ensure that only qualified persons service the installation b. ground detectors are installed on the system c. line-to-neutral loads are not served d. all of these
d. any of these - Where a building or structure contains more than one service disconnect in separate enclosures, grounding electrode connections shall be permitted to be ____. a. multiple individual grounding electrode conductors b. one grounding electrode conductor in a common location c. a common grounding electrode conductor and taps d. any of these True - True or False: Ferrous metal raceways and enclosures for grounding electrode conductors shall be electrically continuous from the point of attachment to cabinets or equipment to the grounding electrode. grounding electrode - A separate bonding jumper to the building structural metal shall not be required if the metal frame of a building or structure is used as the _________ _________ for the separately derived system. shall - Lightning protection system ground terminals _____ be bonded to the building or structure grounding electrode system. d. none of these - The Code requires the installation of an equipment grounding conductor of the wire type in ____. a. rigid metal conduit (RMC) b. Intermediate metal conduit (IMC) c. Electrical metallic tubing (EMT) d. none of these circular mil area - When ungrounded circuit conductors are increased in size to account for voltage drop, the wire-type equipment grounding conductor shall be proportionately increased in size according to the increase in size of the ungrounded conductors using their ________ ___ ____. True - True or False: A grounded circuit conductor is permitted to ground noncurrent carrying metal parts of the equipment, raceways, and other enclosures on the supply side or within the enclosure of the ac service disconnecting means.
True - True or False: Surge arrestors 1000V or less are also known as Type 1 surge protective devices (SPDs). True - True or False: Surge protective devices shall be marked with a short-circuit current rating and shall not be installed where the available fault current is in excess of that rating. necessary - The conductors used to connect the surge protective device to the line or bus and to ground shall not be any longer than __________ and shall avoid unnecessary bends.
