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Old 08-14-2012, 08:58 PM   #1
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Low voltage landscape wiring: Does the wire need to return to the transformer?


Hi there,
I've been looking at tutorials and such but I can't seem to find a solid answer.

I've bought a low voltage outdoor transformer (120W magnetic power pack from Lowes), and I don't know whether the landscape cable needs to go from the transformer, to the lights, and then back to the transformer? Or whether it can just end at the last light?

Any help would be greatly appreciated! I know this might sound like a stupid question, but I don't want to mess up!

Daniel

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Old 08-14-2012, 09:23 PM   #2
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Low voltage landscape wiring: Does the wire need to return to the transformer?


Ends at the last light.

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Old 08-14-2012, 09:32 PM   #3
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Low voltage landscape wiring: Does the wire need to return to the transformer?


Depends on the load, coming back to the transformer lowers the voltage drop, but running individual homeruns works also..


it all depends on the load vs distance.
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Old 08-14-2012, 09:42 PM   #4
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Low voltage landscape wiring: Does the wire need to return to the transformer?


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Depends on the load, coming back to the transformer lowers the voltage drop, but running individual homeruns works also..


it all depends on the load vs distance.
Oh okay thanks. In my case, I will have 8 7W deck lights connected to a wire that's about 55' long. How does that work?
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Old 08-14-2012, 09:49 PM   #5
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Low voltage landscape wiring: Does the wire need to return to the transformer?


That will work just fine....What is the wattage of your xformer?
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Old 08-14-2012, 09:49 PM   #6
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Low voltage landscape wiring: Does the wire need to return to the transformer?


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Oh okay thanks. In my case, I will have 8 7W deck lights connected to a wire that's about 55' long. How does that work?
you will be fine, but I would split the load in half to ensure proper voltage and equal light output.
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Old 08-14-2012, 10:17 PM   #7
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Low voltage landscape wiring: Does the wire need to return to the transformer?


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you will be fine, but I would split the load in half to ensure proper voltage and equal light output.
What do you mean? I calculated the voltage drop to be something less than 5% (I forget the exact number) is that too much? How would I split it?
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Old 08-14-2012, 10:20 PM   #8
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Low voltage landscape wiring: Does the wire need to return to the transformer?


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What do you mean? I calculated the voltage drop to be something less than 5% (I forget the exact number) is that too much? How would I split it?
you run two wires, one wire supplies half the lights, the other wire supplies the other half... this halfs the total load and the voltage drop.

You are probably fine with what you have, but this will ensure future add ons and stability of existing loads.

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