Length of Pole
Setting in Soil
Setting in Solid Rock
(mm)
(mm)
(mm)
16720
2280
1520
18240
2440
1520
Length of Pole
Setting in Soil
Setting in Solid Rock
(feet)
(feet)
(feet)
20
5.0
3.0
25
5.5
3.5
30
5.5
3.5
35
6.0
4.0
40
6.0
4.0
45
6.5
4.5
50
7.0
4.5
55
7.5
5.0
60
8.0
5.0
3.1.1.2
Setting in Soil, Sand, and Gravel
"Setting in Soil" depths, as specified in paragraph entitled "Setting Depth
of Pole," apply where the following occurs:
a.
Where pole holes are in soil, sand, or gravel or any combination
of these;
b.
Where soil layer over solid rock is more than 610 mm 2 feet deep;
c.
Where hole in solid rock is not substantially vertical; or
d.
Where diameter of hole at surface of rock exceeds twice the
diameter of pole at same level. [At corners, dead ends and other
points of extra strain, poles 12160 mm 40 feet or more long shall
be set 150 mm 6 inches deeper.]
3.1.1.3
Setting in Solid Rock
"Setting in Solid Rock," as specified in paragraph entitled "Setting Depth
of Pole," applies where poles are to be set in solid rock and where hole is
substantially vertical, approximately uniform in diameter and large enough
to permit use of tamping bars the full depth of hole.
3.1.1.4
Setting With Soil Over Solid Rock
Where a layer of soil 610 mm 2 feet or less in depth over solid rock
exists, depth of hole shall be depth of soil in addition to depth specified
under "Setting in Solid Rock" in paragraph entitled "Setting Depth of
Pole," provided, however, that such depth shall not exceed depth specified
under "Setting in Soil."
3.1.1.5
Setting on Sloping Ground
On sloping ground, always measure hole depth from low side of hole.
3.1.1.6
Thoroughly tamp pole backfill for full depth of the hole and mound excess
fill around the pole.
SECTION 16301N
Page 31
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