Lighting and Ceiling Fans Chapter 17

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Questions and Answers

What is a ballast?

A type of fan installed in the ceiling for air circulation.

A component in a fluorescent lighting fixture that controls voltage and current flow to the lamp. (correct)

A measure of a lamp's ability to show colors accurately.

A type of lamp that uses light, such as an LED lamp.

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?

A lamp's ability to show colors accurately. Signup and view all the answers

What is the color temperature used to describe?

The apparent warmth or coolness of a light source. Signup and view all the answers

How does a fluorescent lamp generate light?

When the phosphor coating inside a sealed glass tube is struck by energized mercury vapor. Signup and view all the answers

What distinguishes a halogen lamp?

It includes a small amount of halogen such as iodine or bromine. Signup and view all the answers

What is the main feature of a High-Intensity Discharge (HID) lamp?

Light is produced without the use of a phosphor coating. Signup and view all the answers

What is an incandescent lamp?

The original electric lamp using a filament to produce light. Signup and view all the answers

What does lamp efficacy measure?

The comparison of light output to energy consumption. Signup and view all the answers

What is a lumen?

The unit of light energy emitted from a light source. Signup and view all the answers

What is a luminaire?

A complete lighting unit designed to distribute light, protect lamps, and connect to power supply. Signup and view all the answers

What is a sconce?

A wall-mounted lighting fixture. Signup and view all the answers

What characterizes track lighting?

A fixture with several lighting heads attached to a track that can be adjusted. Signup and view all the answers

What is a troffer?

A fluorescent lighting fixture installed in the grid of a suspended ceiling. Signup and view all the answers

What does Type IC designation indicate for light fixtures?

It allows the fixture to be completely covered by thermal insulation. Signup and view all the answers

What does Type Non-IC designation require?

The fixture must be kept at least 3 inches from thermal insulation. Signup and view all the answers

How should Type IC recessed incandescent fixtures be installed?

They must be covered by thermal insulation. Signup and view all the answers

A Type IC recessed incandescent light fixture may be completely covered by thermal insulation.

True Signup and view all the answers

Installation requirements for lighting fixtures are contained in Article _____ of the NEC.

410 Signup and view all the answers

______ lamps are referred to as 'electric discharge' lamps by the NEC.

Fluorescent Signup and view all the answers

A Type IC recessed incandescent light fixture must be kept at least ____ inches from thermal insulation.

3 Signup and view all the answers

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.