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Lecture - B4 Low Voltage System Maintenance Schedule
LHAP 302A-61-40680 (FA25) - Water and Light/Module B - Lighting/Lecture - B4 Low Voltage System Maintenance Schedule.pdf
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11/9/2015 Lecture B4 Low Voltage System Maintenance Schedule
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Lecture B4 Low Voltage System Maintenance Schedule
Site: Olds College Online
Course: LSGR 306 Landscape Construction II (Warke 2015)
Book: Lecture B4 Low Voltage System Maintenance Schedule
Printed by: Annalise Layden
Date: Monday, 9 November 2015, 9:18 AM
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Table of contents
Introduction
Designing for Maintenance
General Maintenance
Review Questions
Assignment D Low Voltage Lighting
Summary
What's Next?
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Introduction
Maintenance of a low voltage lighting system begins when you choose the appropriate material during the design stage. Once you
have completed the installation, you will have to keep the fixtures clean and free from corrosion.
You will also need to adjust them to the correct setting, and replace a lamp from time to time. On rare occasions, the problems may
be more of a challenge; for example, a damaged wire.
Learning Outcomes
Once you have completed this module, you will be able to:
explain how to take maintenance into account during system design, and
describe general maintenance requirements.
Learning Activity
Review Questions Low Voltage System Maintenance
Assignment D Low Voltage Lighting
Note: Module reviews make up 10% of the course grade, and are part of the Assignment Category on the course outline.
Their purpose is to provide you with review to enhance your learning and practice in preparation for the final examination.
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Designing for Maintenance
Start to think about maintenance at the design stage when you are choosing the fixtures, switches, receptacles, boxes and
transformers. Ask the supplier which products last the longest with the fewest breakdowns. As with most products, the ones with the
best record will cost more initially, but should save you time and money over their lifespan. Fixtures constructed from heavier gauge
metal with porcelain lamp sockets will cost more and last longer than fixtures made from lightweight metal or plastic with thin metal
lamp sockets.
If you live near salt water or need to place fixtures near roads that are salted in the winter, you should choose the most durable
fixtures available. Fixtures that will stand up to these adverse conditions are made from copper, bronze and cast aluminum with
porcelain sockets.
Placing the fixtures will also play a role in the amount of maintenance that is required. Avoid locating fixtures in areas where they
will be in danger of damage by lawn maintenance equipment. Also, consider the ease of access to the fixtures for lamp replacement.
If you have placed a large number of your fixtures way up in trees, they will be harder to get to for regular maintenance than those at
ground level.
Another consideration is water from irrigation systems. Even though the fixture may be watertight, water constantly sitting on them
may speed up their deterioration, and will promote the buildup of dust and soil. Ideally, place fixtures out of the reach of your
irrigation system.
As previously mentioned, choosing LED lights will reduce the chore of regular lamp replacement as the LEDs have a 50,000 hour
average lifespan. The average lifespan of an incandescent lamp is 750 to 1250 hours. Halogen lamps last a bit longer; 2000 to 2500
hours.
Purchase the fixtures, cable, boxes, transformers and all other materials with their end use in mind. Be sure that all the materials are
rated for outdoor use. Do not use lighter cable than recommended just because you can save a few dollars at the time of purchase.
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General Maintenance
Lowvoltage lighting fixtures should be kept free of leaves, dirt and other debris. Uplighting fixtures are prone to gather debris on the
lens protecting the lamp. These will need to be cleaned more often than other types of fixtures. Intermittently, lamps and fixtures
must be wiped with a damp cloth to remove dust and residue deposits from sprinklers or rain. Always clean lamps when they are
cool, or they may crack when wiped.
The amount of fixture corrosion is dependent on the area you live in. To help reduce corrosion, you should remove the lamps once a
year and spray the sockets with a siliconebased lubricant. Some manufacturers also recommend a small amount of petroleum jelly in
the socket to prevent corrosion.
As shrubs and groundcovers grow, they will have to be trimmed back from lighting fixtures. Fixtures placed in trees may have some
growth in front of them to diffuse the bright light and reduce glare. When you determine that there is too much light being blocked,
prune the trees, being careful that you do not jar the fixtures or damage the cable with your pruning equipment. After a major pruning
you may have to realign some fixtures to shield the fixture and reduce glare. (Remember to check that you are not aiming the fixtures
into the neighbour’s yard.) Cables anchored to trees will need regular checking and, occasionally, will have to be reattached.
If you carefully plan your installation, you will not have to move a fixture. However, in the event that a fixture does need to be
relocated, it can be done without a lot of trouble. If you did not bury the lowvoltage cable, just pick up the cable and fixture and
move it to the new location. If the cable is not long enough, it can be spliced. A splice must always be sealed with a waterproof
connector to prevent short circuits. In cases where the cable has been buried, you will have to dig up the cable, move the fixture, and
then bury the cable once again. Leaving an extra meter of cable at each fixture during the installation will provide some leeway for
fixture movement later.
Fixtures may get pushed out of adjustment occasionally as only small ground stakes anchors them. A quick adjustment will soon
have them standing upright and once again lighting the way for you and the guests to your garden.
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Review Questions
Complete the Review Questions for this module.
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Assignment D Low Voltage Lighting
Complete Assignment D Low Voltage Lighting
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Summary
Maintenance of a low voltage lighting installation really begins during the design process, by choosing appropriate materials for each
installation. Choosing long lasting LED, over incandescent or halogen lamps will also reduce the maintenance task of lamp changing
as the lamps burn out.
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What's Next?
The next series of modules focuses on decks. The first in the series, E1, addresses the different functions a deck can play in the
landscape, and the design guidelines one should consider when designing a deck. Deck materials are also covered in this module.
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