I found a table in -The American Electricians Handbook- 11th Edition-
showing such depths.
It says that for poles in a line, 1/6th the overall depth is one rule.
It also shows a table of depths, with the following for "curves,
corners, and points of extra strain":
pole overall hole
30 6.0
35 6.5
40 6.5
45 7.0
50 7.5
55 7.5
60 8.0
65 8.5
70 8.5
75 9.0
The dpeths for poles in a straight line is 1/2 foot less.
It also shows two ways of setting poles in concrete for poor soils,
and how to set a pole by hand using pikes or a gin pole.
I also recall the subject being treated thoroughly in the US Navy
Construction Electrician 2+3 training manual, to the point that when I
was a boy, I, with a few friends, placed a 50 foot pine tree in the
middle of an open field, with no adults, and a block and tackle as the
most sophisticated tool used. I sometimes wish I lived on a farm now.
73, doug
who is still working on getting a Glen Martin 1832 onto the roof.
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