Choose the best answer:

  1. The installation requirement for receptacles and cord connectors, contained in 210.7 of the 1999 NEC, has been relocated to Art. _____ of the 2002 NEC.

    (a) 392
    (b) 406
    (c) 408
    (d) 527

  2. Where more than one branch circuit supplies more than one receptacle on the same yoke in a(n) _____ occupancy, a means to simultaneously disconnect the ungrounded conductors supplying those receptacles shall be provided at the panelboard where the branch circuits originated.

    (a) dwelling unit
    (b) commercial
    (c) industrial
    (d) all of these

  3. All 15A and 20A, single-phase, 125V receptacles installed in dwelling unit boathouses must be GFCI-protected.

    (a) True
    (b) False

  4. All 15A and 20A, single-phase, 125V receptacles in commercial occupancy _______ must be GFCI-protected.

    (a) bathrooms
    (b) rooftops
    (c) kitchens
    (d) all of these

  5. You may not install receptacles higher than _____ in. above the countertop in a dwelling-unit kitchen.

    (a) 10
    (b) 12
    (c) 18
    (d) 20

  6. You must locate at least one wall receptacle outlet within _____ in. of the outside edge of each basin in a dwelling unit bathroom.

    (a) 12
    (b) 24
    (c) 30
    (d) 36

  7. In a(n) ______ occupancy, you must locate a 15A or 20A, single-phase, 125V receptacle outlet within 25 ft of heating, air conditioning, and refrigeration equipment.

    (a) dwelling unit
    (b) commercial
    (c) industrial
    (d) all of these

  8. If the stairway in a dwelling unit has four or more risers, you must install a wall switch for a lighting outlet(s) at each floor landing — including an entryway — of an interior stairway.

    (a) True
    (b) False

  9. The demand factors for optional service or feeder load calculations for new restaurants were revised in the 2002 Code, eliminating the problem of additional loads reducing the service and feeder size.

    (a) True
    (b) False

  10. If management establishes, documents, and maintains safe switching procedures, and the installation is monitored by _____ persons, you need not install the disconnecting means at the building or structure when working with outside branch circuits and feeders.

    (a) maintenance
    (b) management
    (c) service
    (d) qualified

  11. You can use hardwood trees to support overhead service conductors.

    (a) True
    (b) False

  12. You must install service cables in ______ to protect them from physical damage.

    (a) rigid metal conduit
    (b) intermediate metal conduit
    (c) Schedule 80 rigid nonmetallic conduit
    (d) any of these

  13. A remote control device, such as a shunt-trip pushbutton, can be used to control the service disconnecting means and it can serve as the building or structure disconnect if it is located at a readily accessible location outside the building or structure.

    (a) True
    (b) False

  14. A remote control device with a shunt-trip pushbutton used to open the service disconnecting means can be considered the service disconnecting means if it is located in accordance with 230.70(A)(1).

    (a) True
    (b) False

  15. You aren't required to make branch circuit overcurrent protection devices accessible to occupants of hotel or motel guestrooms if the facility is under continuous building management.

    (a) True
    (b) False

  16. You must mount enclosures for overcurrent devices in a vertical position unless it's _____.

    (a) convenient
    (b) practical
    (c) impracticable
    (d) unreasonable

  17. Circuit breakers used to switch 120V or 277V fluorescent lighting circuits must be listed and marked _____.

    (a) SWD
    (b) HID
    (c) a or b
    (d) a and b

  18. You can install a circuit breaker with a slash rating, such as 120/240V or 480Y/277V, in a solidly-grounded circuit in which the nominal voltage of any one conductor to _____ does not exceed the lower of the two values of the circuit breaker's voltage rating and the nominal voltage between any two conductors does not exceed the higher value of the circuit breaker's voltage rating.

    (a) another conductor
    (b) earth
    (c) an enclosure
    (d) ground



Answers and Discussion

  1. b, 406. Usability of the Code has become a matter of great importance to the Code-making panels. They believed that relocating the installation requirements for receptacles and cord connectors to Art. 406 would make the Code easier to use.

  2. d, all of these. The new subsection of 210.7(C) requires all ungrounded (hot) conductors terminating on multiple receptacles (duplex) on the same yoke from multiple circuits to be disconnected simultaneously regardless of occupancy type. This rule is intended to prevent persons from unintentionally working on energized circuits they thought were disconnected. The 1999 NEC only required the circuit disconnect to simultaneously interrupt the multiwire circuit to multiple receptacles on the same yoke if the receptacle was in a dwelling unit.

  3. a, True. A new subsection, (8), of 210.8(A) requires all 15A and 20A, single-phase, 125V receptacles installed in boathouses to be GFCI-protected.

  4. d, all of these. A new subsection, (3), of 210.8(B) requires all 15A and 20A, single-phase, 125V receptacles installed in kitchens to be GFCI-protected, even if they don't supply the countertop surfaces.

  5. d, 20. Per 210.52(C)(5), you can now install receptacles as high as 20 in. above the kitchen counter surface. The revision increases the distance from 18 in. to 20 in. to permit the installation of a multi-outlet assembly in the 2-in. recess of an upper kitchen cabinet, thereby allowing for the mounting of under-the-cabinet appliances. Note: The distance from the bottom of an upper kitchen cabinet to a kitchen counter surface is typically 18 in.

  6. d, 36. Per 210.52(D), the 2002 Code clarifies that the required bathroom receptacle outlet for a dwelling unit must be installed within 3 ft of the outside edge of each basin and that it must be located on a partition or wall adjacent to the basin or basin counter surface.

  7. d, all of these. This section now requires you to locate a 15A or 20A, single-phase, 125V receptacle outlet within 25 ft of heating, air-conditioning, and refrigeration equipment for all occupancies, including one- and two-family dwelling units. In addition, if this receptacle is located outdoors [210.8(A)(3)] or in a crawl space at or below grade [210.8(A)(4)] it must be GFCI-protected. However, this rule does not require you to locate a receptacle within 25 ft of ventilating equipment.

  8. b, False. The requirements of 210.70(A)(2)(C) mandate that you install a wall switch for a lighting outlet(s) at each floor level and landing level (including an entryway) of interior stairways in a dwelling unit, if the stairway between floor levels has six or more risers. The word “step” was changed to “riser” to conform to the building code term for this element of a stairway.

  9. a, True. The demand factors for optional service or feeder load calculations for new restaurants (220.36) have been revised to avoid this problem.

  10. d, qualified. Exception No. 1 of 225.32 was revised to ensure that in addition to using safe switching procedures, the installation be monitored by qualified persons who have the skills and knowledge related to the construction and operation of the electrical equipment and installation, and who have received safety training on the hazards involved with electrical systems.

  11. b, False. Per 230.10, you can't use vegetation, such as trees, to support overhead service conductors.

  12. d, any of these. Item (3) of 230.50 was revised from “rigid nonmetallic conduit” to “Schedule 80 rigid nonmetallic conduit” to clarify that only Schedule 80 rigid nonmetallic conduit can be used to protect service cables from physical damage. The UL listing requirement (UL White Book) specifies that Schedule 40 conduit is permitted outdoors only where not subject to physical damage.

  13. b, False. Per 230.70(A)(3), you can use a remote-control device such as a shunt-trip push button to control the service disconnecting means, but the disconnecting means must be installed at a readily accessible location either outside the building or structure or inside nearest the point of entry of the service conductors, in accordance with 230.70(A)(1).

  14. b, False. New text added to 230.71(A) clarifies that a remote-control device, such as a shunt-trip pushbutton, is not to be considered as the service disconnecting means.

  15. a, True. The general requirements of 240.24 state that each occupant of a premises must have ready access to all overcurrent devices protecting the conductors supplying that occupancy. However, a new exception was added to 240.24(B), stating that branch-circuit overcurrent protection devices need not be accessible to occupants of hotel and motel guestrooms, as long as building management provides electric maintenance and the devices are under continuous building management supervision.

  16. c, impracticable. Per 240.33, you must mount enclosures for overcurrent devices in a vertical position unless impracticable. You can install circuit breaker enclosures horizontally if the circuit breaker handles are operated vertically. An enclosure that contains one circuit breaker could be mounted horizontally, but an enclosure containing a panelboard with circuit breakers would not be permitted to be installed horizontally.

  17. c, a or b. Per 240.83, circuit breakers used to switch 120V or 277V fluorescent lighting circuits must be listed and marked “SWD” or “HID.”

  18. d, ground. This installation is acceptable per the rules in 240.85.

Questions and answers excerpted from Mike Holt's 2002 Code Change Workbook.

Are you still confused by the Code? For additional information on Code-related topics please visit www.mikeholt.com or send an e-mail directly to the author at mike@mikeholt.com.