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POSITIONING AND BURYING LOW-VOLTAGE CABLE
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After the lighting cable is laid out from the transformer location to each position where the low-voltage luminaires will be located, adequate slack should be allowed for stresses caused by frost, rain, or ground settling The luminaires are then clamped to the cable with insulation displacement connectors (IDCs), and a trench is cut into the ground along the entire path of the cable to a depth of 6 to 8 in The cable is then buried to prevent it from becoming a tripping hazard and protect it from abrasion caused by pedestrian traffic or severing by a lawn mower or other lawn tool The luminaires are then positioned in the ground in the planned locations, and the cable is connected to the terminals on the transformer Finally, the transformer is plugged into a GFCI receptacle located indoors or in a suitably protected location Any exposed cable left above ground should be protected from abrasion by short lengths of metal or nonmetallic conduit The task of passing the cable under sidewalks or paved walkways can be simplified by first digging a shallow trench on both sides
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LOW-VOLTAGE OUTDOOR WIRING
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Figure 7-17 Low-voltage outdoor lighting circuit is powered from a transformer/timer that converts 120 V AC to 12 V AC
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of the pavement to be crossed Then a plugged length of rigid metal conduit can be driven through the ground underneath the pavement When the plug is removed, the cable can be snaked through the conduit, and the conduit can be left in position to protect the cable Some electrical contractors and electricians have questioned the reliability and effectiveness of low-voltage outdoor lighting systems, especially in places where there are severe winters and deep frost layers form in the ground
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LIGHTING, LAMPS, AND LUMINAIRES
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CONTENTS AT A GLANCE Overview Light Spectrum Color Temperature Incandescent Lamps Tungsten-Halogen Lamps Specialized Lamps Fluorescent Lamps Fluorescent Luminaires and Ballasts High-Intensity Discharge (HID) Lamps Characteristics of Typical Lamps Residential Lighting Design Types of Lighting Luminaires and Lighting Systems Calculations for Room Lighting Residential Room Lighting Outdoor Lighting Glossary of Lighting Terms
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LIGHTING, LAMPS, AND LUMINAIRES
Overview
Electric lighting has brought about a significant improvement in the standard of living for millions of people all over the world The availability of bright, instantly available illumination has made it possible for people to read, write, and do intricate work more effectively during the nightime hours, without concern for the fire hazards of open flames in fireplaces or from lamps fueled by coal gas, whale oil, or kerosene It also made homes more secure and streets safer to travel after dark The first electric power stations were built in cities in the United States and England to extend the benefits of electric lighting to the general public More than 100 years later, more electricity is still consumed for lighting than for any other purpose Incandescent lamps have long been the dominant light sources, but that dominance is being challenged by halogen and fluorescent lamps The halogen lamps offer more intense and natural-appearing light, while the newer fluorescent lamps consume less power for equivalent illumination, have far longer lives, and also provide cooler, more natural light This chapter describes, illustrates, and explains the most popular light sources as well as the high-intensity discharge (HID) lamps An extensive table gives the leading features of popular examples of all of these lamps Other topics discussed in this chapter include the different types and styles of light fixtures (now called luminaires), and the principles of home lighting design for each room Suggestions for obtaining the most cost-effective illumination are given, and various methods are described for calculating recommended illumination levels for each room Useful formulas for making those determinations are included Other topics in the chapter are the installation of lighting in and around swimming pools and fountains, general 120-V outdoor lighting, and low-voltage lighting for lawns and gardens A glossary of illumination terms at the end of the chapter defines many words and phrases associated with electric lighting for ready reference
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