Questions and Answers
What is a ballast?
What typically characterizes a ceiling-suspended paddle fan?
Usually having four or five blades for air circulation.
What is a Class P ballast?
A ballast with a thermal protection unit built in by the manufacturer.
What does color rendition measure?
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What is the color temperature used to describe?
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How does a fluorescent lamp generate light?
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What distinguishes a halogen lamp?
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What is the main feature of a High-Intensity Discharge (HID) lamp?
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What is an incandescent lamp?
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What does lamp efficacy measure?
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What is a lumen?
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What is a luminaire?
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What is a sconce?
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What characterizes track lighting?
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What is a troffer?
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What does Type IC designation indicate for light fixtures?
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What does Type Non-IC designation require?
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How should Type IC recessed incandescent fixtures be installed?
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A Type IC recessed incandescent light fixture may be completely covered by thermal insulation.
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Installation requirements for lighting fixtures are contained in Article _____ of the NEC.
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______ lamps are referred to as 'electric discharge' lamps by the NEC.
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A Type IC recessed incandescent light fixture must be kept at least ____ inches from thermal insulation.
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Study Notes
Lighting Terms and Definitions
- Ballast: Regulates voltage and current flow in fluorescent lighting fixtures.
- Ceiling-suspended paddle fan: Ceiling-mounted fan with 4-5 blades for air circulation, often includes a lighting fixture; requires a specially listed support box.
- Class P ballast: Features built-in thermal protection that disconnects the circuit if the ballast's temperature exceeds safe limits.
Lighting Characteristics
- Color rendition: Indicates a lamp's capability to accurately render colors; measured by the Color Rendering Index (CRI), ranging from 1 (poor) to 100 (excellent) with a CRI of 85 viewed as very good.
- Color temperature: Describes a light source's warmth, indicated in Kelvin (K); below 3200 K is considered "warm," while above 4000 K is "cool."
Types of Light Sources
- Fluorescent lamp: Produces light through energized mercury vapor interacting with a phosphor coating inside a glass tube.
- Halogen lamp: A type of incandescent lamp enhanced with halogen elements like iodine or bromine.
- High-intensity discharge (HID) lamp: Gaseous discharge lamp that generates light without phosphor coatings.
- Incandescent lamp: The traditional electric lamp that emits light through a heated tungsten filament.
- LED Lamp: A solid-state light source using light-emitting diodes (LEDs) for illumination, requiring multiple diodes for sufficient brightness.
Light Measurement and Efficacy
- Lamp efficacy: Evaluates light output relative to energy consumption, measured in lumens per watt (L/W); e.g., a 100-watt lamp producing 1750 lumens has an efficacy of 17.5 L/W.
- Lumen: Unit quantifying the amount of light emitted by a source.
Lighting Fixtures
- Luminaire: A complete lighting unit comprising lamps and components for light distribution, positioning, and power connection.
- Sconce: A wall-mounted lighting fixture.
- Track lighting: Adjustable lighting heads on a mounted track, allowing targeted illumination of specific areas.
- Troffer: A fluorescent fixture installed in suspended ceiling grids.
Fixture Types and Installation
- Type IC: Allowed to be covered with thermal insulation without risk of overheating.
- Type Non-IC: Requires at least 3 inches of clearance from thermal insulation.
Regulations and Standards
- NEC Article 410: Governs installation requirements for lighting fixtures.
- Type IC fixtures: Must be used when thermal insulation covers recessed incandescent fixtures to prevent overheating.
Additional Notes
- Type IC recessed incandescent fixtures can be fully insulated.
- A Type IC fixture dictates a minimum of 3 inches distance from insulation.
- High-intensity discharge lamps do not utilize phosphors for light production.
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Explore key terms related to lighting fixtures and ceiling fans with our chapter 17 flashcards. This quiz focuses on important definitions that will enhance your understanding of electrical components and home appliances.