Questions and Answers
A standard incandescent dimmer can be used to control which of the following loads?
Two 12-volt batteries would be connected in ___ to deliver the correct voltage to a 24-volt load.
series
Typical 12-volt automobile batteries contain ___ cells.
6
Negative battery terminals generally have a ___ color marking.
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Ceiling-suspended (paddle) fans must be specially supported for all of the following reasons, except for ___.
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A storage battery is comprised of one or more rechargeable cells of the ___ or other rechargeable electrochemical types.
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The voltage dropped across Element 2 is ___ volts.
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These elements are ___ connected.
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Type D, C, AA, and AAA batteries are ___-volt batteries.
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The transistor-type batteries used in smoke detectors have a voltage rating of ___.
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Along a wall line in a house, the maximum spacing between receptacles in the dining room is ___ feet.
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The NEC® at Section 210.12 requires that ___ protection be provided for all electrical outlets in residential bedrooms.
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Along a wall line in a cafeteria, the maximum spacing between receptacles is ___.
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The Code section that specifies whether or not the sliding panels in glass doors are counted in the maximum spacing is ___.
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The NEC® at 314.27(C) states that listed outlet boxes shall be permitted to support ceiling-suspended fans that weigh ___ pounds or less.
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The single-pole switch to the left of the sliding doors controls ___.
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The Code reference(s) for the outside receptacle of this dwelling to be GFCI protected is ___.
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A 125-volt receptacle installed outside a house is required to be ___.
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The Code section that specifies that white conductors in a cable assembly must be re-identified where used to 'feed' a switch is ___.
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The minimum cubic inch capacity of the plaster ring that will be installed on the box is ___ inch.
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The minimum depth of EACH box is ___ inch where two 3" × 2" metal switch boxes will be ganged together.
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The minimum cubic inch capacity of the plaster ring when using 10 AWG wire is ___ inch.
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A single 3" × 2" × 21/4" device box can hold no more than ___ 14 AWG conductors.
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The switch box shown will contain a duplex receptacle that includes one "hot," one neutral, and one EGC. The maximum number of conductors is ___.
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Study Notes
Electrical Components and Definitions
- Dimmer controls do not apply to "an exhaust fan" or "a low-voltage lighting transformer."
- Two 12-volt batteries are connected in series to provide 24 volts.
- Typical 12-volt automobile batteries consist of 6 cells.
- Black color markings indicate negative battery terminals.
Safety and Standards
- Ceiling-suspended fans require special support for safe grounding.
- Storage batteries may consist of lead-acid or nickel-cadmium cells.
- The NEC® mandates arc-fault circuit interrupter (AFCI) protection for all electrical outlets in residential bedrooms.
Voltage Ratings and Receptacles
- Voltage dropped across Element 2 in Figure 116.425 is 240 volts.
- Types D, C, AA, and AAA batteries are rated at 1.5 volts.
- Smoke detector batteries are typically rated at 9 volts.
Receptacle Spacing and Regulations
- Maximum spacing between dining room receptacles is 12 feet (excluding doors).
- Cafeteria dining room receptacle spacing is not specified in the NEC®.
- Code section 210.52(A)(2)(2) governs spacing regarding sliding panels in glass doors.
Outlet and Box Requirements
- Outlet boxes must support ceiling-suspended fans weighing 70 pounds or less.
- An outside receptacle must be weatherproof and GFCI protected according to NEC requirements.
- White conductors in a cable that "feed" a switch must be re-identified per section 200.7(C)(1).
Box Specifications
- The minimum cubic inch capacity for a plaster ring over a box using 12 AWG wire is 6.75 inches.
- Each of the two 3" × 2" switch boxes for a 2-gang configuration requires a minimum depth of 2 3/4 inches.
- A box using 10 AWG wire has a plaster ring capacity requirement of 2.0 inches.
- A single device box measuring 3" × 2" × 2 1/4" can accommodate no more than 5 14 AWG conductors.
Additional Considerations
- Certain installation methods (i.e., EMT, MC cable) have specific grounding provisions as per NEC codes.
- Proper adherence to codes ensures electrical safety and compliance in residential and commercial settings.
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Description
Test your knowledge on electrical components, safety standards, and voltage ratings with this quiz. Covering essential definitions and regulations, this quiz is perfect for students and professionals in the electrical field. Challenge yourself and ensure you're well-versed in the latest electrical standards and practices.
