Tree Trimming Field
Guide Section Codes
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Triming Home
Section 4292
Power Line Hazard Reduction. Except as
otherwise provided in Section 4296, any person that owns, controls,
operates or maintains any electrical transmission or distribution
line upon any mountainous land, forest-covered land, brush-covered
land or grass-covered land shall, during such times and in such areas
as are determined to be necessary by the Director of Forestry and
Fire Protection or the agency which has primary responsibility for
fire protection of such areas, maintain around and adjacent to any
pole or tower which supports a switch, fuse, transformer, lightning
arrested, line junction, deadend or corner pole, a firebreak which
consists of a clearing of not less than 10 feet in each direction
from the outer circumference of such pole or tower. This section does
not, however, apply to any line which is used exclusively as telephone,
telegraph, telephone or telegraph message call, fire, alarm or other
line which is classed as a communication circuit by the Public Utilities
Commission. The Director of Forestry and Fire Protection or the agency
which has primary fire protection responsibility for the protection
of such areas may permit exceptions from the requirements of this
section which are based upon the specific circumstances involved (For
exemptions, see Title 14, California Code of Regulations, Section
1253-57 inclusive).
Section 4293
Power Line Clearance Required. Except
as otherwise provided in Sections 4294 and 4296, inclusive, any person
that owns, controls, operates or maintains any electrical transmission
or distribution line upon any mountainous land, forest-covered land,
brush-covered land or grass-covered land shall, during such times
and in such areas as determined to be necessary by the Director of
Forestry and Fire Protection or the agency which has primary responsibility
for the fire protection of such areas maintain a clearance of the
respective distances which are specified in this section in all directions
between all vegetation and all conductors which are carrying electric
current:
(a) For any line which is operating at
2,400 or more volts, but less than 72,000 volts, 4 feet.
(b) For any line which is operating at
72,000 or more volts, but less than 110,000 volts, 6 feet.
(c) For any line which is operating at
110,000 or more volts, 10 feet.
In every case, such distance shall be
sufficiently great to furnish the required clearance at any position
of the wire or conductor when the adjacent air temperature is 120
degrees Fahrenheit or less. Dead trees, old decadent or rotten trees,
trees weakened by decay or disease and trees or portions thereof that
are leaning toward the line which may contact the line from the side
or may fall on the line shall be felled, cut or trimmed so as to remove
such hazard. The Director of Forestry and Fire Protection or the agency
which has primary responsibility for the fire protection of such areas
may permit exceptions from the requirements of this section which
are based upon the specific circumstances involved (See also Title
14, California Code Regulations, Section 1250 et. seg.).
Section 1254
Minimum Clearance Provisions PRC 4292.
The firebreak clearances required by PRC 4292 are applicable within
an imaginary cylindrical space surrounding each pole or tower on which
a switch, fuse, transformer or lightning arrester is attached and
surrounding each deadend or corner pole, unless such pole or tower
is exempt from minimum clearance requirements by provisions of 14,
CCR, 1255 or PRC 4296. The radius of the cylindroid is 3.1 m (10 feet)
measured horizontally from the outer circumference of the specified
pole or tower with height equal to the distance from the intersection
of the imaginary vertical exterior surface of the cylindroid with
the ground to an intersection with a horizontal plane passing through
the highest point at which a conductor is attached to such pole or
tower. Flammable vegetation and materials located wholly or partially
within the firebreak space shall be treated as follows:
(a) At ground level-remove flammable
materials, including but not limited to, ground litter, duff and dead
or desiccated vegetation that will propagate fire, and;
(b) From 1-2.4 m (0-8 feet) above ground
level remove flammable trash, debris or other materials, grass, herbaceous
and brush vegetation. All limbs and foliage of living trees shall
be removed up to a height of 2.4 m (8 feet).
(c) From 2.4 m (8 feet) to horizontal
plane of highest point of conductor attachment remove dead, diseased
or dying limbs and foliage from living sound trees and any dead, diseased
or dying trees in their entirety.
Section 1256
Minimum Clearance Provisions-PRC 4293
Minimum clearance required by PRC 4293 shall be maintained with the
specified distances measured at a right angle to the conductor axis
at any location outward throughout an arc of 360 degrees.
Clearance shall include any position
through which the conductor may move considering the size and material
of which the conductor is made, span length, foreseeable wind velocities
for any location and height, species and flammability of adjacent
vegetation.
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