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Old 06-16-2010, 07:09 AM   #15
Rivet Master
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I've found direct burial cable cheaper than normal cable more than once - so I have 175' of underground feeder 6-3 armored by 1-1/2" conduit. I also laid a bare copper solid 2AWG ground in the trench to better keep nearby lightning strikes from damaging the insulation. Up here in Minnesota if the ground heave from 4 months of being frozen doesn't get the UF lines lightning surges will...

Also laid in trench was an eight conductor lawn sprinkler control low-voltage cable to use for alarm and telephone...


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Old 06-16-2010, 07:20 AM   #16
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Wiring Simplified

there's a small paperback book that we've used in it's various updated editions for the last 35+ years. it's called "Wiring Simplified" by Richter & Schwan.

the current edition is

you can usually find a copy hanging in the electrical dept of a Lowes or HD, priced at < $10.

it's a handy tool and reference for designing or spec'ing a project like this the right way the first time.

besides sizing your wire or conductors, and conduit, the book will also help you with things like how many bends you're allowed in your conduit before a pull box is required, and limits on the length of conduit before you need a pull box, and burial depth.

another handy item for your project might be a bottle of "pulling lubricant". it's amazingly helpful stuff, even when you're pulling short runs.

IDEAL INDUSTRIES, INC. - ClearGlide™ Wire Pulling Lubricant

if you were going to hand dig that 150' trench, think about renting a machine or hiring your local sprinkler guy to trench for you, instead.

a 150' x 24" trench with a machine will be reasonably straight with a consistent depth, and depending on the soil conditions, take only about an hour to complete.

"Direct Burial Warning Tape" placed into your trench, 6-12" below the surface will also help prevent future problems from an errant shovel....

lastly, you might also consider burying telephone & coax cables alongside your conduit, or, placing a second, empty conduit for future use.

work safely, and good luck with your project!


Joseph & Gabrielle

Simplicity is the ultimate sophistication - Leonardo da Vinci.

WBCCI 2087 - AIR 3144 - TAC-NJ2
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Old 06-16-2010, 08:19 AM   #17
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Originally Posted by TG Twinkie View Post
If you are running that far, I would slide the conduit over the wire one stick at a time, then just be carefull not to over do it with the glue. Once all the pipe is assembled , then just slide it in the trench. I'm not sure but I don't think your trailer requires 220 volts. Make sure you know the requirement and that you have met it before turning on the power. If it is wrong you will probably let the smoke out of some stuff. Since electrical devices work on smoke, if the smoke is released, they won't work any more. LOL.
Right -- the trailer is 110V all the way. The most common mentioned draw for the A/C compressor at startup is in the 22-23 amp range. Allow for use of the microwave or a hair dryer to coincide with that. Member Chuck has used a 20A circuit for years without damaging his A/C but is very careful to avoid use of other high draw appliances when the it is running.

5 meter Langford Nahanni

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Old 06-16-2010, 10:41 AM   #18
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In general direct burial is cheaper than conduit and is fine unless you're going under a driveway (in which case just that part of the cable needs conduit), have to cross sharp rocks that you can't remove or cover with sand, anticipate that you'll be digging right next to the cable often in the future (digging next to direct buried wire requires somewhat more care), or think that you might pull different wires through the conduit for some reason.

If you are going to run a 30 amp setup then you can try to find 8-2 UF with ground, although it's something of an odd size.

If you do run in conduit I would use 1.25" conduit to make the pull easier. Yes the charts say that 3/4" will work but with that distance you'll have trouble pulling the wires.

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