| This article will be a breath of fresh
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| | your system. Use either a 10/2-gauge
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| air for some of you and a gut wrenching
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| | wire, which has a constant of 11920, or a
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| process for others. Without getting too
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| | 12/2-gauge wire, which has a constant of
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| involved within the process, I will say
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| | 7500.
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| this particular piece of the puzzle is
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| | With this information and the constants,
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| designed for the person that thinks with
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| | lets figure a "run for fun". This example
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| the left side of your brain. Their many
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| | shows a run for 80 feet and on the run,
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| studies and books written about the left
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| | there are 4 fixtures that have a 20-watt
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| side and right side of our brains. Many
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| | lamp in each. We have a total of 80 watts
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| people enjoy a "good" living dealing with
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| | on a run of 80 feet and 12/2 gauge wire
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| issues relating to the left and right
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| | is used for the run. 80-watts x 80 feet
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| side of our brains. This could be the
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| | =6400, 6400/7500 (constant) = .85 voltage
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| start of another book relating to that
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| | drop. Now subtract .85 (voltage drop)
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| subject; however, I am not going there.
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| | from 12 (amount of volts from source) and
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| Too keep this to the simplest form I can,
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| | we have a resulting voltage reading of
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| I will say our brain is divided into two
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| | 11.15 volts. I like to keep lamps in a
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| sides. We have the left side and the
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| | range of 10.5 volts to 11.7 volts for
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| right side.
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| | peak performance; therefore, the reading
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| The left side of the brain functions by
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| | of 11.15 volts fits very will within the
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| way of using logic, facts, knowledge,
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| | range. The main thing to remember is to
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| math and science and is detailed
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| | choose the lamp you want and need to do
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| oriented. If you fall into this category,
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| | the job you want. Once you decide on the
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| you will enjoy this article. Meanwhile,
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| | lamp, engineer the system to supply the
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| the right side of the brain functions by
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| | proper voltage to the lamp.
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| using feelings, images, symbols, sees the
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| | A rule of thumb on sizing wire for runs
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| "big picture", is very imaginative and
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| | is to always go bigger if there is some
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| believes things are possible by taking
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| | doubt. The 10/2 gauge wire expense is
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| risks. If you fall into this category, I
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| | just slightly higher than the 12/2 gauge
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| hope your partner is a left-brain person.
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| | wire; however, the peace of mind is well
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| This article will be dull and boring for
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| | worth the difference. I have included a
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| you even though it is an extremely
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| | flowchart to use as an estimate on which
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| important process for you to achieve your
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| | gauge wire to use on which run. This does
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| "big picture" on your home to create the
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| | not replace the voltage drop formula and
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| "WOW" effect you want.
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| | measuring every lead to every fixture
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| My wife and I are a good team because she
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| | using a multi meter to get the proper
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| is a professional photographer, thus a
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| | reading. For runs over 100 feet I
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| right brain person. I am a left-brain
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| | recommend using the 12/2 gauge cable just
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| person. We compliment each other and
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| | because it can handle more with less
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| guess who takes pictures of my
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| | voltage drop. QUICK WIRE SIZING GUIDE:
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| landscape-lighting installations. A good
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| | Use the guide to select wire sizes for
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| starting subject for this article is
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| | each run - "Are there more than 100 watts
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| "voltage drop". Voltage drop is created
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| | lamp load on the run"? If your answer is,
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| by internal resistance to the flow of
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| | yes then you Use #10-2 / If your answer
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| electricity through electric wire or
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| | is no then the next question is "Is the
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| cable. It is the difference between the
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| | run longer than 100 feet? If your answer
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| voltages at the beginning of a cable run
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| | is no you Use #12-2 and if its Yes then
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| compared to the voltage at the end of a
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| | you Use #10-2.
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| run. We need to compensate for the
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| | WIRE AMP RATINGS: Wire Size #12/2 100w
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| voltage drop in order to keep the same
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| | 8.3A is recommended and the maximum is
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| voltage to all fixtures. If we do not,
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| | 192w/16A. Wire Size #10/2 140w/12.0A is
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| the end fixtures will have lamps with low
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| | recommended and the maximum is 288w/24A.
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| voltage and the results will be a
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| | You will notice the low chart gives the
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| decrease in brightness. This is why we
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| | wire size with recommended and maximum
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| can see the yellow looking lights at the
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| | figures. It gives reference to watts and
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| end of the runs.
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| | amps. Remember the formula: (Amps x volts
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| The formula for calculating voltage drop
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| | = watts Or Watts/volts = amps) you will
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| is: Total Watts x Length of Run / Cable
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| | be fine on amps using these guidelines. I
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| Size Constant = VOLTAGE DROP. You are now
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| | keep a maximum of 110 watts per run on 12
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| asking yourself," What is cable size
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| | 2 cable and 150 watts on 10/2 cable. I
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| constant". That is a predetermined amount
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| | know the system is not working hard and I
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| and I will not show the chart for the
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| | feel that it will produce an efficient
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| different size cables. Instead, I will
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| | operating system.
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| share the constants that you will use for
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|
