Cooper Lighting LUMIERE TR900T User's Manual
Contents
1. as an example only output requirements may vary depending on individual situations and preferences There are several ways to minimize the impact of voltage drop Use larger gauge cable e Shorten cable runs e Use lower wattage lamps e Reduce the number of fixtures on the run e Divide the fixtures over more runs from the transformer e Use multiple transformers CABLE SIZE CONSTANT CHART Cable size 18 16 14 12 10 8 6 Cable constant 1380 2200 3500 7500 11 920 18 960 30 150 VOLTAGE DROP CHART Voltage at lamp Life expectancy of lamp of rated candlepower 13 2 2 3 rated life 350 12 6 3 4 rated life 180 12 0 as rated 100 11 5 2X rated life 80 11 0 3X rated life 74 10 5 5X rated life 65 10 0 9X rated life 50 u Er Do ww Dw ey ieee ORDERING INFORMATION SAMPLE NUMBER TR900T Order transformers and low voltage cable as separate line items UU COOPER LIGHTING2. LOW VOLTAGE CABLE amp TRANSFORMERS o rm Wu 2 2 lt LUMI RE DESCRIPTION Transformers reduce line voltage to 12 volts for use with Lumi re low voltage fixtures Transformers are available in four basic types e Hard wire installation Standard outdoor low voltage lighting transformer for hard wiring direct to conduit Cord and plug Plug in directly to existing outlets for ease of installation Also available with a built in timer Inground Low profile inground installation for reduced visual impact and increased flexibility Compact solid state electronic transformers For use in approved housings or boxes Transformer Selection The total wattage of all lamps used must not exceed the rating of the transformer selected for the installation For example a 150VA VA watts transformer cannot power four fixtures with 50 watt lamps The transformer selected should match the total lamp wattage as closely as possible It is good practice to use at least 33 to 50 percent and no more than 85 to 90 percent of the transformer s rated capacity Voltage Drop Make sure that the transformer selected reduces the appropriate line voltage For example do not use a 120 to 12 volt transformer with a 277 volt system Lumi re Atlantis series fixtures model 1407 1409 must be used with model T300 which is approved for use in pool and spa type applications Transformers must be installed
3. in accordance with local and national electrical codes and other rules regulations and requirements Resistance to electricity passing through electrical wiring causes the voltage at the end of a run of wire to be lower than the voltage at the transformer This will cause fixtures at the end of a run to be noticeably dimmer than those closer to the transformer The factors affecting voltage drop are the total wattage of lamps on the run the length of the run and the gauge of the wire VOLTAGE DROP FORMULA Total watts on cable x length of run Voltage Drop Cable size constant Voltage drop is not always bad For example dropping voltage at the lamp to 11 5 volts will give 80 of the lamp s rated candlepower and double the rated life of the lamp This is acceptable in most applications and will result in lower maintenance costs The accompanying chart demonstrates how voltage at the lamp affects rated lamp life and rated candlepower Sample Landscape Lighting Installation We recommend using 12 2 or larger inground stranded cable To control voltage drop for each 100 watts allowed use 100 feet of wire maximum to stay at approximately 10 volts at the end of the run For example a 300 watt 300VA transformer may have three separate runs with 100 maximum on each run This is standard procedure for low voltage installations Any setup within these parameters will maintain sufficient lumen output Provided
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