Wiring Outdoor lamp posts and fountain


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Old 04-12-20, 09:34 AM
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Wiring Outdoor lamp posts and fountain

Putting underground electrical cable 12/2 in 1/2 pvc to power 4 lamp posts and 1 water fountain. How do I run the wire and pvc to 4 posts for post lamps and to the 1 water fountain? Do I run 5 lines, one to each? I would think I could run one line for all four lamp posts and another line to the water fountain.
 
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Old 04-12-20, 09:42 AM
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It's a great idea using PVC conduit as it's protective of the wiring and it's easy to pull in future wiring for changes. There would be no UF cable involved.

You pull in just the wires you need now. That would be......
1 wire for always live for fountain. Recommend using black.
1 wire for switch line to 4 pole lights. Recommend using red.
1 wire for common neutral. Needs to be white.
1 wire for common ground. Needs to be green.

The lights and fountain would be on the same circuit.
 
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Old 04-12-20, 04:23 PM
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I'm a little confused on running the pvc, I can't seem to find T fittings that would enable me to run the wire from one lamp post to the next lamp post. Only finding 90 and 45 degree bends as fittings.
 
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Old 04-13-20, 10:07 AM
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The easiest way is to run two PVC conduits up above ground and into the light post. One is the 'incoming' and one is the 'outgoing' to the next post. You should be able to fit 3 1/2" PVC conduits into the bottom of a standard light post too.

It would look like this. Obviously this pic is from a commercial installation, but you get the basic idea.

The alternative is to use an accessible junction box somewhere and branch out from there. But it has to be accessible and can't be buried. So it's just one more thing to be in the way somewhere.

Unrelated - I would
 
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Old 04-13-20, 10:30 AM
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Appreciate your help. That makes sense now.
 
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Old 04-20-20, 07:22 PM
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Wire guage for underground?

I'm running wire about 60 feet underground to power 4 outside lamps that use 3 led bulbs rated at 5 watts each for total 60 watts so I believe I can run 12 guage wire that long?
 
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Old 04-20-20, 08:08 PM
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With that short of run and the low current draw..... you could use #14.
#12 will be more than adequate.
 
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Old 04-21-20, 09:49 AM
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#14 is good as long as it's on a 15A circuit breaker. #12 is required if you are using a 20A breaker for some reason.

In general, runs under about 100' no one ever worries about upsizing wires and voltage drop. Once you're above that 100' mark, it's at least worth considering (though often isn't an issue until 150-200' depending on loads).
 
 

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