measure the original (SF 4)
circumference of the pole; then refer to
Check the original end reduced
circumferences against table 1.
To determine the shell thickness, bore
four holes (preferably 5/16- or 3/8-inch
apart; measure the shell
thickness at each hole, add, end divide
by 4. No transmission pole shall remain
in service with a shell thickness less
then 3 inches.
5.3.4. Enclosed pocket. - An enclosed
pocket is en off center void as shown in
table 4, and its diameter should be
measured by boring holes as described
thickness of the shell, refer to table 4 for
the reduction in circumference. After
calculating the reduced circumference,
check the original end reduced
For more then one enclosed pocket,
determine the reduction for each pocket
separately end add them to determine
the total reduction.
VI. APPROVED TREATMENTS
6.1.1. Groundline treatment. - Supple-
mental field treatments are not a
substitute for thorough original treatment
by the pole supplier. Nevertheless, all
treated poles sooner or later lose
resistance to decay, end groundline
treatment provides an economical
extension of their physical life. Experi-
ence has shown that groundline decay
can be postponed almost indefinitely by
periodic inspection and maintenance.
Groundline treatment is recommended
under the following conditions:
(1) Whenever a pole is excavated during
an inspection, and the pole is sound or
decay is not so far advanced that the
pole must be replaced.
(2) Whenever a pole over 5 years old
(3) Whenever a used pole is installed
as a replacement.
Various products and methods are now pro-
moted for the groundline treatment of stand-
ing poles. Some solutions are available for
pouring on the outer surface of the pole for
groundline treatment, but the use of a pre-
servative paste or grease is recommended.
Accepted pastes or greases containing toxic
fungi-killing agents, including a high
concentration of sodium fluoride or
a. Pento-creto paste (heavy-duty type),
manufactured by Androc Chemical
Co., Minneapolis, Minn.
b. Osmoplastic, menufactured by Os-
mose Wood Preserving Co. of
American, Inc., Buffalo, N.Y.
C. Pole Preservative PasteT-X,
manufactured by Wood-Treating
Chemicals Co., ST. Louis, Mo.
d. POL-NU or TIMPREG,
manufactured by Chapmen Chemical
Co., Memphis, Tenn.
After excavation and inspection below
groundline have been completed, use a blunt
tool to scrap away all external decay found
on the pole. Take measurements to
determine whether the pole meets the mini-
mum permissible circumference in
circumference of the pole meets the require-
ments, clean the pole surface with a wire
brush. Remove all debris from the excavated
area. Cover the surface of the pole from 3
inches below the decayed section up to at
least 6 inches above the ground level with an
acceptable grease or paste applied according
to instructions furnished for the specific
preservative used. 'then wrap the treated
section of the pole with two layers of Kraft
laminated paper or a suitable substitute. Use
(FIST 4 - 6)