I would suggest using UF type wire AND putting it in some
PVC pipe, probably 3/4 dia, so that if you should dig
into it while planting a shrub someday, you will hit the PVC
and avoid nicking the UF wire, regardless of the depth....
You don't have to make joints and connectors with the
PVC since it is being used only as an open conduit
and that makes it cheap and easy. The UF will be
resistand to anything that is going to happen...
Just a suggestion, which works well for me, who is
always digging around with a shovel somewhere....
Here in Arizona, we recently installed code approved underground cable
to a well head.
Cost of $5,000 [cheap] to go about 150 feet. including wiring and
metering connection to APS utilities.
The ditch required minimum depth [can't remember] and this caught me
off guard, minimum width! [also can't remember]
But it took some guy with a major piece of equipment to dig the trench
for over half a day. Plus, WE chiseled out the solid boulders hit here
and there. Just to meet the depth/width reuqirements.
However, the wiring looked like standard underground cable you can buy
at HD. That 10 Gauge two conductor stuff with GND.
You're not attaching directly to the AC Utilities, so you should be
able to do your own. Put in proper GFCI breaker setup, get a trencher,
dig the minimum depth and width [going around your septic
requirements], and drop in such a cable to lay in 'once and for all'
power to your pond. Put inside a conduit, or not? *IF* you do, arch
the conduit [like a piece of plumbing pipe] so that at each end water
can run out to a void area underground [upside down plastic 'bubble'.]
Seems like a lot of extra effort, but long run will be worth it. And,
I mean long run. The problem can be seen, just envision a conduit that
goes down, comes back up, as though it were a buried water hose with
wires running through it. Long term collect water and just asking for
If me, I'd use heavy pvc conduit to shield the cable [cables cost way
too much to allow accidental nicking] That way, if you forget and
accidentally hit the pvc it's sacrificial.
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