We just did a 4 pole installation using DPW top-of-pole mounts. We used
Teck-90 armored watertight cable between the poles and from the poles to
the house. The Teck-90 spiral wound metal flex conduit with an
everything-resistant black sheath on it pre-stuffed with just about any
combo of wires you might want. We cast 2" PVC sweeps into the 36" dia.
sonotubes so the cable could enter underground and come up next to the
pole. We put PVC end caps on the tops of the sweeps with cable holes in
them, just for neatness.
Teck-90 is a revelation. We laid out and buried a double run of 100 feet
of the stuff in the time it took the excavator to go along the trench.
He never got out of the cab. We get it on a 500' spool and mount the
spool in the back of a pickup. Then we just run off however much we
need, cut it to length, and throw dirt on it.
We got it from Graybar for slightly less than the price per foot of the
equivalent wire and PVC conduit. I had been meaning to write a post on
here about it.
We also just did PV on a barn roof and did the
spool-it-off-and-clip-it-up routine. Made the run from the roof to the
inverter on the north side first floor in about 40 minutes. No conduit
bending. The end connectors are kind of pricey, but the time saved is huge.
Hilton
--
Hilton Dier III
Renewable Energy Design
Partner, Solar Gain LLC
453 East Hill Rd.
Middlesex, VT 05602
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