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Exterior switches have to be installed in weatherproof boxes and are required to be fitted with weatherproof covers There are covers available for single, double, and triple-gang boxes that are operated by toggle levers You can also get a cover for a combination outletswitch device
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There are three types of conduit that can be used with exterior wiring Rigid conduit is often used Intermediate metallic conduit (IMC) is also used Then there is PVC nonmetallic conduit This type of conduit comes in Schedule 40 PVC and Schedule 80 PVC Not all locations allow its use, but most do Any connectors and fittings used will have to conform to code requirements for the type of conduit being installed
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Exiting a home wall with conduit will require a special L-shaped connector that is known as an LB conduit body This is a 90 degree fitting that is meant to house UF cable This device contains the junction between interior cable and exterior cable The fitting allows a transition and delivers the UF cable to an underground location An LB conduit body is fitted with a gasket that seals the cable connection against weather conditions An LB conduit body has a removable cover on the back (Figure 36) In special applications, an LB opening may not be accessible There is a version available with the opening on its right side This is called an LR (Figure 37) A version available with the opening on its left side is called an LL (Figure 38)
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Exterior lights run the gamut of styles, sizes, and shapes Code requirements call for exterior lighting at all outdoor entrances to homes These lights must be controlled by switches The lights are required for all entries and exits accessible from ground level, at attached
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FIGURE 36 LB conduit body
FIGURE 37 LL conduit body
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FIGURE 38 LR conduit body
garages, and at detached garages that are equipped with electrical power There are, of course, many other situations where exterior lighting might be wanted Here are some examples of such uses: Pool lighting Decorative lighting Pond lighting Deck lighting Walkway lighting Security lighting Spotlighting The two most common types of lights used outside are reflectortype (R-type) lights and parabolic aluminized reflector (PAR) lights (Figures 39a, b) Both of these types of lamps have a long life and Floodlighting Garden lighting Accent lighting Driveway lighting Play area lighting Party lighting
Exterior Wiring
a reflective interior surface They also resist weathering Of the two types, PAR lamps are better suited for outdoor use than some kinds of R-type lamps If you plan to use R-type lamps, check to see that they are approved for the intended use Outdoor lamps of these types are used in outdoor lamp sockets that have gaskets to make the installation weatherproof Many types of outdoor lighting run on 120 volt systems, but there are also a number of fixtures that operate on low-voltage wiring If low-voltage wiring is used, a transformer that will convert 120 volt current to 12 volts is needed Walkway lighting is a good example of where you might use low-voltage wiring
AUTOMATED LIGHTS
Automated lights could be controlled by sensors or by timers Motion-sensor floodlights and spotlights are good choices to deter burglars The same lights are convenient when you pull into your driveway after dark If outdoor lighting is connected to a homeautomation system, this part of the equation is already solved If not, you have to decide between sensors and timers
FIGURE 309a Metal halide outdoor floodlights utilizing parabolic aluminized reflectors (Courtesy Lithonia Lighting)
FIGURE 309b Photometric data for metal halide outdoor floodlights with parabolic aluminized reflectors (Courtesy Lithonia Lighting)
Exterior Wiring
Motion-detector lights are designed to come on when motion is detected Most sensors are a built-in part of the lamp holder A photocell shuts the light down during daylight hours Most motion-detector lights can be programmed to remain on for a set amount of time A typical manual switch can also be used to operate a light Other sensors can turn lights on when light levels outside fall to a certain level and turn the lights off when there is sufficient natural lighting This type of system is often used for driveway and walkway lights Traditional timer switches can be used to control outdoor lights General opinion states that timers should not be used on lamps with a wattage rating in excess of their full load rating Timers can also be used to control multi-circuit lighting contactors Some timers are not designed to prevent damage from overloading The best choice for pre-programmed lighting is an automated home system
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