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the efficient use of an irrigation system Outdoor lighting should be on an automated house system Anything that uses electricity and is found outdoors is a potential candidate for an automated system
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System specifications vary considerably Most systems are fairly simple to install, especially the X-10 system You should request installation instructions and specifications from all manufacturers who make the systems you anticipate working with Read and follow the manufacturer s recommendations This is the best way to avoid making mistakes by trying to apply generic installation procedures to specific systems
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ince the early days of the 20th century, lighting with electricity has been the driving force behind development of electrical power utilization Compared to open flames in the form of oil or gas lanterns, electric light was relatively safe Remember how Chicago s great fire started Well, if Mrs O Leary s cow had kicked over an industrial fluorescent strip with a 14 gauge wire guard, Chicago would look slightly different today Shortly after Edison designed the first practical incandescent lamp, electricians went to work wiring America for light Electricians installed wire and light fixtures in homes, offices, barns, hospitals, and schools Those days have long since passed Electricians no longer install or maintain light fixtures Yes, you heard me correctly! Actually, what used to be called a light fixture is now called a luminaire This new term comes from Article 100 of the 2002 National Electrical Code (NEC) For the purpose of our discussion on lighting in this book, we use the terms luminaire and light fixture interchangeably Today we have several basic types of lighting such as incandescent, fluorescent, high-intensity discharge (HID), and emergency lighting They may be recessed, surface-mounted, pole-mounted, portable, or even buried in the earth Lighting can be accomplished through a variety of voltages from low-voltage to high-voltage Power supplies to fixture lamps can be AC or DC depending on the type of lamp utilized
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As an electrician, you may be called upon by your customers, or your employer, to be their source of lighting information Having a general knowledge of all types of lighting and expertise in specific areas of lighting will be impressive and leave your customers with a sense of confidence in you Article 410 of the NEC covers luminaires (lighting fixtures), lamps, and lamp holders Article 411 covers lighting that operates at no more than thirty volts The first thing any electrician must do under any circumstances is to become familiar with code requirements concerning a particular application This is done by studying local and national codes, manufacturers recommendations, and checking with the code enforcement officer or inspector for local jurisdictions Luminaires and associated equipment located in hazardous (classified) areas are covered by Articles 500 through 517 Here are some quick code tips on lighting that will be useful in planning and carrying out a project: Live parts must not be exposed to contact under normal operating conditions Luminaires in damp or wet locations must be installed so that water cannot enter or accumulate in them Fixtures must be listed and marked for use in damp or wet locations Incandescent fixtures in closets must have a completely enclosed lamp Fluorescent fixtures are also acceptable with or without enclosed lamps Luminaires must be listed for through-wiring if you intend to extend branch circuit wiring to another fixture Luminaires must be designed to provide access to junction points Fixtures installed in suspended ceilings must be fastened to the gridwork with bolts, screws, clips, or rivets Outdoor lighting fixtures and associated equipment may be supported by trees Metal parts of light fixtures must be grounded The grounded conductor of a lighting circuit must be connected to the screw shell terminal Branch circuit conductors within 3 inches of a ballast must be rated 90 degrees C Recessed incandescent fixtures must be thermally protected Only type IC rated recessed fixtures are permitted in direct contact with insulation and combustible material Non-type IC fixtures must be kept 3 inches away from these materials
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