Construction Specification
Site Fencing
Document No. 0000-10-SPE-0002
Quality Information
Project Name:
Oyu Tolgoi
Document Company: Construction and Engineering Group (CEG) - Engineering Manager
Revision History
Revision
0
Issue Purpose
Issued for Use
Prepared By
FH
Approved By
BP
Date
01 July 2016
Oyu Tolgoi LLC
Detailed Revision History
Document Number
0000-10-SPE-0002
Document Type
Specification
Document Name
Site Fencing
Rev
Clause No.
A
All
Detailed Description of Changes
Consolidation of CS-10-010 Rev 1 and CS-10-105 Rev 1 into 0000-10-SPE-0002
Standard Specification Site Fencing
Document No. 0000-10-SPE-0002 Revision 0
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TABLE OF CONTENTS
1.
2.
GENERAL ..................................................................................................................... 4
1.1
Summary ........................................................................................................... 4
1.2
References ........................................................................................................ 4
1.3
Storage and Protection .................................................................................... 7
1.4
Scheduling and Sequencing............................................................................ 7
1.5
Submittals ......................................................................................................... 7
PRODUCTS .................................................................................................................. 7
2.1
3.
Materials ........................................................................................................... 7
EXECUTION ............................................................................................................... 12
3.1
Examination .................................................................................................... 12
3.2
Preparation ..................................................................................................... 12
3.3
Installation ...................................................................................................... 12
3.4
Grounding ....................................................................................................... 15
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1.
GENERAL
1.1
Summary
A.
Scope of Specification
This specification prescribes the requirements for the installation of chain link
fence (galvanized or PVC coated), high tensile wire fence (galvanized) and
the associated posts, rails, braces, terminal posts, gates, barbed wire,
controls, and other related materials.
B.
Related Specifications
The following specifications prescribe items of related work:
0000-10-SPE-0001
Earthworks and Roadways
0000-15-SPE-0001
Structural Steel and Other Metalwork - Fabrication
and Erection
0000-15-SPE-0003
Structural Concrete and Reinforcing
Coordinate work prescribed by this specification with Work prescribed by the
above listed specifications.
C.
Terminology
1.
Chain Link Fence Classification
Chain link fencing shall be classified by fabric category as galvanized
(zinc coated) or PVC coated (Polyvinyl chloride) galvanized steel. Wire to
be referred to as galvanized or PVC coated.
2.
High Tensile Wire Fence Classification
High Tensile Wire Fence shall be classified by fabric category as
galvanized (zinc coated) steel. Wire to be referred to as galvanized
coated.
3.
Barbed Wire
Barbed wire for additional security shall be classified as galvanized (zinc
coated) or galvanized, PVC coated.
4.
NPS
Nominal pipe size
1.2
References
Unless stated otherwise in this specification, all design, material and equipment
manufacturing, fabrication, testing, installation and construction for this project shall
be in accordance with the current version of the following Mongolian standards.
Additionally, the current version of standards published by the following agencies
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and institutions shall be used where applicable and not already covered by the
Mongolian Standards.
The publications listed below form part of this specification. Each publication shall be
the latest revision and addendum in effect on the date this specification is issued for
construction unless otherwise noted. Except as modified by the requirements
specified herein or the details of the drawings, all Work included in this specification
shall conform to the applicable provisions of these publications.
A.
B.
C.
Construction Norms and Rules of Mongolia
1
CNR 2.01-01-93
Climatic and Geophysical Parameters for Construction
2
CNR 22.01-01
Norms and Regulations on Construction Planning in
Seismic Zones in Mongolia
3
CNR 2.01-07-90
Load and Effect
4
CNR 11-01-98
Regulation on Elaboration, Agreement and
Confirmation of
Design Documents
5
SNIP II-M.I-71
Master Plans of Industrial Enterprises
6
CNR 11-03-02
Regulations on Elaboration of Design Documents of the
Construction Facilities on the Territory of Mongolia by
Foreign Organizations
People’s Republic of China Standards
1
GB50187-93
Code for Design of General Plan of Industrial
Enterprises
2
GB/T 13912-92
Metallic Coating – Hot Dip galvanized Coating on
Ferrous Product Specification
3.
GB/T 139122002
Metallic Coating- Hot Dip galvanized Coating on
Ferrous Product Specification
ASTM American Society for Testing and Materials
ASTM A53/A53M
Specification for Pipe - Steel, Black, and Hot Dipped,
Zinc-Coated, Welded, and Seamless
ASTM A101/A101M
Standard Specification for Steel, Sheet and Strip, HotRolled, Carbon, Structural, High-Strength Low-Alloy
and
High-Strength
Low-Alloy
with
Improved
Formability, and Ultra-High Strength
ASTM A116
Coated (Galvanized) Steel Woven Wire Fence Fabric
ASTM A120
Specification for Pipe, Steel, Black, and Hot Dipped
Zinc-Coated (Galvanized) Welded and Seamless, for
Ordinary Uses
ASTM A121
Specification
Barbed Wire
Standard Specification Site Fencing
Document No. 0000-10-SPE-0002 Revision 0
for
Zinc-Coated
(Galvanized)
Steel
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ASTM A123/A123M
Specification for Zinc (Hot-Dipped
Coatings on Iron and Steel Products
ASTM A143
Recommended Practice for Safeguarding Against
Embrittlement of Hot Dipped (Galvanized) Structural
Steel Products and Procedure for Detecting
Embrittleness
ASTM A153/A153M
Specification for Zinc Coating (Hot Dip) on Iron and
Steel Hardware
ASTM A392
Specification for Zinc-Coated Steel Chain Link Fence
Fabric
ASTM A475
Specification for Zinc-Coated Steel Wire Strand
ASTM A525
Specification for General Requirements for Steel Sheet,
Zinc-Coated (Galvanized) by the Hot Dip Process
ASTM A570
Specification for Steel, sheet and strip, carbon, HotRolled, Structural Quality
ASTM A641/A641M
Specification for Zinc-Coated (Galvanized) Carbon
Steel Wire
ASTM A653/A653M
Standard Specification for Steel Sheet and Zinc-Coated
(Galvanized) or Zinc- Coated Alloy- Coated
(Galvanized) by the Hot-Dip Process
ASTM A809
Specification for
Carbon Steel Wire
ASTM A817
Specification for Metallic Coated Steel Wire for Chain
Link Fence Fabric
ASTM A854
Standard Specification for Metallic-coated
Smooth High Tension Fence and Trellis Wire
ASTM C33
Specification for Concrete Aggregate
ASTM C94/C94M
Standard Specification for Ready-MIXED Concrete
ASTM C150
Specification for Portland Cement
ASTM F567
Practice for Installation of Chain Link Fence
ASTM F626
Specification for Fence Fittings
ASTM F668
Specification for PVC (Polyvinyl Chloride) Coated Steel
Chain Link Fence Fabric
ASTM F669
Specification for Strength Requirements of Metal Posts
and Rails for Industrial Chain Link Fence
ASTM F934
Specification for Standard Colors for Polymer – Coated
Chain Link Fence Materials
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Aluminum-Coated
Galvanized)
(Aluminized)
Steel
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D.
ASTM F1043
Standard Specification for Strength and Protective
Coatings on Steel Industrial Chain Link Fence
Framework
ASTM F1083
Specification for Pipe, Steel, Hot-Dipped, Zinc-Coated
(Galvanized), Welded for Fence Structures
PIP CVS02830
Fabrication and Installation of Chain Link Fence and
Gate
OSHA Occupational Safety and Health Administration
OSHA Construction Industry Standard, Title 29, Code of Federal Regulations,
part 192, Safety and Health Regulations for Construction
1.3
1.4
Storage and Protection
A.
Store materials 300 mm off the ground or slab by using wood blocking or other
approved materials.
B.
Store materials in areas of the job site designated or approved by the
Company.
Scheduling and Sequencing
Certain portions of the work are specified to be completed and operational prior to
completion of all Work. Sequence equipment and gate installation, and properly
protect equipment to prevent contamination or damage to equipment in adjacent
work areas. Phasing and sequencing shall be subject to the approval of the
Company.
1.5
Submittals
Materials are subject to testing. Mill certificates and product specification verification
shall be submitted to the Company.
2.
PRODUCTS
2.1
Materials
A.
General
Fence fabric, posts, top rail, tension wire, corner posts, barbed wire, and
appurtenances shall conform to the ASTM codes and standards for the
appropriate type of materials as listed under Section 1.2 of this specification,
and more specifically listed in the sections below.
B.
Materials shall be uniform, consistent, and meet the following requirements:
1.
Fabric
a.
Galvanized fabric shall be one piece widths up to 3.6 m high,
heavy galvanized chain link fence, conforming to ASTM A392,
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Class 2, of 50 mm mesh 9 gage wire (3.8 mm in diameter), with the
top and bottom selvedges twisted and barbed.
b.
2.
Line Posts
a.
b.
3.
PVC coated fabric shall be one piece widths up to 3.6 m high,
ASTM F668, 7 mils (0.1778 mm)of thermally bonded PVC over 8.5
grams zinc substrate; 50 mm mesh 9 gage wire (3.8 mm in
diameter); with the top and bottom selvedges twisted and barbed.
Colors shall be in accordance to ASTM F934, (Brown).
Galvanized
i)
For fabric up to 2.5 m high, line posts shall be 64 mm NPS
schedule 40 galvanized steel pipe with an outside diameter
of 60 mm in accordance with ASTM A53/A53M or 48 mm x
41 mm x 3 mm thick rolled formed C section from steel
conforming to ASTM A570, grade 45 continuous coated in
accordance with ASTM A525.
ii)
For fabric more than 2.5 m high, line posts shall be 76.2 mm
NPS schedule 40 galvanized steel pipe with an outside
diameter of 89 mm, in accordance with ASTM A53/A53M, or
57 mm x 43 mm x 3 mm thick C-section rolled formed from
steel conforming to ASTM A570, grade 45, continuous
coated in accordance with ASTM A525.
iii)
For high tensile wire fence, line posts shall be 76.2 mm NPS
schedule 40 galvanized steel pipe with an outside diameter
of 89 mm, in accordance with ASTM A53/A53M.
PVC Coated
i)
For fabric up to 2.5 m high, line posts shall be C-section
rolled from steel conforming to ASTM A570, grade 45, 48
mm x 41 mm x 3 mm thick, continuous coated in accordance
with ASTM A525 and primed to receive 10 to 15 mils (0.254
– 0.381 mm) thermal fusion coating of PVC.
ii)
For fabric more than 2.5 m high, line posts shall be C-section
rolled from steel conforming to ASTM A570, grade 45, 57
mm x 43 mm x 3 mm thick, continuous coated in accordance
with ASTM A525, and primed to receive 10-15 mils (0.254 –
0.381 mm) thermal fusion coating of PVC.
End, Corner and Pull Posts
a.
Galvanized
i)
Standard Specification Site Fencing
Document No. 0000-10-SPE-0002 Revision 0
End, corner and pull posts 2.5 m high or less shall be 64 mm
NPS schedule 40 galvanized steel pipe with an outside
diameter of 73 mm in accordance with ASTM A53/A53M, or
89 mm x 89 mm x 3.4 mm thick rolled formed corner section,
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conforming to ASTM A570, grade 45, continuous coated in
accordance with ASTM A525.
ii)
b.
c.
End, corner and pull posts over 2.5 m high shall be 75 mm
NPS schedule 40 galvanized steel pipe with an outside
diameter of 89 mm in accordance with ASTM A53/A53M.
PVC Coated
i)
End corner and pull posts 2.5 m high or less shall be Csection rolled formed from steel conforming to ASTM A570,
grade 45, coated in accordance with ASTM A525, and
primed to receive 10 to 15 mils (0.254 – 0.381 mm) thermal
fusion coating of PVC.
ii)
End corner and pull posts over 2.5 m high shall be C-section
rolled formed from steel conforming to ASTM A570, grade
45, coated in accordance with ASTM A525 and primed to
receive 10 to 15 mils (0.254 – 0.381 mm) thermal fusion
coating of PVC.
For high tensile wire fence:
i)
ii)
4.
5.
Corner ,end and pull posts less than or equal to 2.4 m high
shall be 3 inch (76.2 mm) NPS schedule 40 galvanized steel
pipe with an outside diameter of 88.9mm in accordance with
ASTM A53/A53M.
The top rails & braces connected the end, corner and pull
posts shall be 75 mm NPS schedule 40 galvanized steel pipe
with an outside diameter of 88.9 mm, in accordance with
ASTM A A53/A53M.
Top Rails
a.
Galvanized top rails shall conform to 32 mm NPS schedule 40
galvanized steel pipe with outside diameter of 42 mm, in
accordance with ASTM A120, or C-section rolled formed from steel
conforming to 41 mm x 32 mm x 1.9 mm thick continuous coated in
accordance with ASTM A525.
b.
PVC coated top rails shall conform to 32 mm NPS schedule 40
galvanized steel pipe in accordance with ASTM A525 and primed
to receive 10 to 15 mils (0.254 –0.381 mm) thermal fusion coating
of PVC.
Tension Wire
a.
Galvanized tension wire shall be 7 gage US Steel wire galvanized
in accordance with ASTM A116 coating class III. The tension wire
shall be stretched near the bottom of the fence and attached at 600
mm intervals. If top rail is not used, a tension wire shall be
stretched at the top also.
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6.
7.
8.
9.
b.
PVC coated tension wire shall be 7 gage U.S. Steel wire
galvanized in accordance with ASTM A116 and PVC coated of
same quality, color, and process as specified for the fabric. The
tension wire shall be stretched near the bottom of the fence and
attached at 600 mm intervals. If top rail is not used, a tension wire
shall be stretched at the top also.
c.
High Tensile wire shall be 121/2 gage steel, galvanized in
accordance with ASTM A854, with a yielding strength of
200,000PSI (1380MPa).
Appurtenances
a.
Galvanized brace bands, tension bands, and tension bars shall be
fabricated of 3 mm x 22 mm galvanized steel with galvanized steel
carriage bolts and nuts in accordance with ASTM A153. Tension
bars shall be 6 mm x 19 mm galvanized steel bar in accordance
with ASTM A123.
b.
PVC coated brace bands, tension bands, and tension bars shall be
fabricated of 3 mm x 22 mm galvanized steel with galvanized steel
carriage bolts and nuts as per ASTM A123. Tension bars shall be 6
mm x 22 mm galvanized and thermally fused PVC coated 10 to 15
mm.
Fabric Ties
a.
Galvanized fabric ties shall be class I galvanized steel wire not less
than 9 gage.
b.
PVC coated fabric ties shall be 9 gage, class I galvanized steel
wire thermal fused and PVC coated 10 to 15 mils (0.254 – 0.381
mm).
Post Tops
a.
Galvanized one post top shall be provided for each post, with
openings to permit through passage of top rail. Materials shall be
pressed steel or malleable iron that is designed as watertight
closure cap for tubular posts and shall be galvanized per ASTM
A153.
b.
PVC coated one post top shall be provided for each post, with
openings to permit through passage of top rail. Materials shall be
pressed steel or malleable iron that is designed as watertight
closure cap for tubular posts and shall be thermally fusion coated
with PVC 10 to 15 mm.
Star Picket
a.
1.5 inch (38.1mm) NPS schedule 40 star picket shall be galvanized
steel pipe with an outside diameter of 48.3mm in accordance with
ASTM A53/A53M.
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10.
11.
Barbed Wire
a.
Galvanized barbed wire shall consist of double stranded, 121/2
gage wire galvanized to ASTM A121 or ASTM A641/A641M, class
3, or aluminized to ASTM 585, Class II, with 14 gauge 4 point
barbs spaced 125 mm apart.
b.
PVC coated barbed wire shall consist of 2 double stranded of
121/2 gage ASTM A121, class 3, thermally bonded PVC coated
with 4 point round aluminum barbs, spaced on 125 mm centers.
c.
The top 300 mm of the fence shall consist of 3 strands of barbed
wire attached to 45 degree angle heavy pressed arms capable of
withstanding without failure 113 kg downward pull at the outermost
end of the arm. Barbed wire will be installed on sections of fence
as indicated on the drawings or as directed by the Company.
Gates
a.
Galvanized Swing Gate Posts
i.
Gateleafs up to and including 2 m wide; 64 mm NPS
schedule 40 pipe with outside diameter of 73 mm.
ii.
Gateleafs over 2 m and up to and including 4 m wide; 90 mm
NPS schedule 40 pipe with outside diameter of 100 mm.
iii.
Gateleafs over 4 m and up to and including 5.5 m wide; 150
mm NPS schedule 40 pipe with outside diameter of 169 mm.
iv.
Gate leaves over 5.5 m and up to and including 9.1 m; 200
mm NPS schedule 40 pipe with outside diameter of 220 mm.
v.
Gateleafs for high tensile wire fence; 150 mm NPS schedule
40 pipe with outside diameter of 169 mm.
vi.
All pipes to be continuous galvanized in accordance with
ASTM A120.
b.
c.
Galvanized Gate Perimeter Frames
i.
Frames shall be of 38 mm schedule 40 pipe with outside
diameter of 48 mm, galvanized in accordance with ASTM
A53-A53M.
ii.
Gate materials such as fabric, bolts, nuts, tension bars, and
barbed wire, shall be consistent with fence materials.
iii.
Gates shall be manually or electrically operated. Shop
drawings for gates over 3.7 m wide shall be submitted for
approval.
PVC coated gate materials shall be consistent with the materials
specified for PVC coated fence materials.
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C.
Concrete
Concrete shall be in accordance with 0000-15-SPE-0003 Structural Concrete
and Reinforcing Concrete shall have a minimum of 25 MPa compressive
strength at 28 days.
D.
Steelwork Fabrication
All steelwork fabrication shall be in accordance with 0000-15-SPE-0001
Structural Steel and Other Metalwork - Fabrication and Erection.
3.
EXECUTION
3.1
Examination
The physical locations of features such as fence lines, and gates shall be in
accordance with the Drawings.
3.2
Preparation
Provide a reasonably smooth profile at the fence line. The bottom of the fence shall
not be more than 50 mm above the finished ground line. Where the fence crosses
features such as streams and drainage ditches and it is impractical to conform the
fence to the ground contour, the fence shall span the depression, unless otherwise
shown on the plans. Close the space below the bottom of the fence with extra fence
fabric or barbed wire. If extra length fence posts are required at such locations, they
shall be furnished and installed in lieu of standard length posts, together with any
intermediate posts, stakes, braces, extra fabric, wire or other fixtures or
appurtenances as may be required.
3.3
Installation
A.
Post Spacing
Install line posts and brace posts at intervals not to exceed 3 m. Posts shall be
evenly spaced. Install corner or slope posts where changes in grade exceed a
30 degree deflection.
B.
Installation of Line, Corner, Pull, and Terminal Posts
1.
Set line, corner, pull, and terminal posts vertically in cylindrical concrete
foundation in accordance with the schedule in Table 1 and in accordance
with ASTM F567. For high tensile wire fence, the set line, corner, pull,
and terminal posts vertically in cylindrical concrete foundation in
accordance with the drawings.
Table 1 Line, Corner, Pull, and Terminal Post Installation Schedule
Foundation
Foundation
Post
Diameter
Depth
Embedment
Line post
230 mm
1.0 m
0.9 m
Terminal post
300 mm
1.0 m
0.9 m
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Foundation
Diameter
Foundation
Depth
Post
Embedment
64 mm
300 mm
1.0 m
0.9 m
89 mm
300 mm
1.0 m
0.9 m
150 mm
460 mm
1.2 m
1.0 m
200 mm
600 mm
1.8 m
1.6 m
Gate post:
C.
D.
2.
The exposed surface of the concrete foundation shall be a smooth 12
mm crown, sloping away from the post. The post shall be 150 mm from
the bottom of the concrete pour.
3.
Holes may be hand augered or drilled. Spread soil from the excavations
uniformly adjacent to the fence line or as directed by the Company. If
rock is encountered, drill into the rock for at least 300 mm for line posts,
and 450 mm for corner or terminal posts. Drill holes 25 mm larger than
the diameters as per the schedule (Refer to Table 1). If solid rock is
below soil overburden, drill to full depth required, except penetration into
rock need not exceed minimum depths specified.
Setting Post
1.
Remove any loose and foreign materials from the sides and bottoms of
the holes; moisten the soil prior to placing the concrete. Center and align
posts in the holes. Place the concrete in a continuous pour in the hole
around the posts, and tamp to consolidate. Check post for vertical and
horizontal alignment, and secure to allow proper curing of the concrete.
2.
Extend footings for gate posts to the underside of the bottom of the
hinge. Keep concrete surfaces moist for at least 7 days after placement,
or cure with membrane curing material or other approved method.
3.
Posts that are set in sleeved holes shall be grouted in place using a nonshrink portland cement grout approved by the Company.
4.
Prior to placing components such as fabric, rails, tension wire, and gates,
ensure that the concrete has reached at least 75 percent of the design
strength stated in Section 2.1 C. or has cured a minimum of 7 days after
setting the posts.
Rails and Bracing
1.
Install fence with a top rail and bottom tension wire. If a top rail is omitted
for a temporary fence, install a top tension wire also. Top rails shall be
continuous through post caps or extension arms bending to the radius for
wired runs. Space 9 gage minimum fabric tie wire at 600 mm on centers.
2.
Install tension wires parallel to the line of fabric by weaving wire, of not
less than 6 gage, of the appropriate type through the fabric and tying to
each post.
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3.
E.
F.
G.
Install top rail and tension wire prior to installation of the chain link fabric.
Provide an expansion/contraction coupling, standard with the
manufacturer, every 30 m on straight runs, installed within 600 mm of a
line post. Use end clamps for attaching the top rail or tension wire, and
brace to the terminal and gate posts. Use corner clamps for attaching top
rails or tension wire and brace to corner posts.
Installing Fabric
1.
Install the chain link fence fabric so that the posts are enclosed. Stretch
the fabric taut, approximately 50 mm above the ground, and fasten
securely to the posts.
2.
Cut the fabric and attach each span independently at all terminal and
corner posts. Use stretcher bars with fabric bands spaced at a maximum
380 mm intervals to fasten fabric to terminal posts. Use tie wire, metal
bands, or other approved material attached at maximum 380 mm
intervals to fasten fabric to line posts. Fasten the top edge of the fabric to
the top rail or tension wire with wire ties at intervals not exceeding 380
mm. Fasten the bottom edge of fabric to the bottom tension wire with
wire ties at intervals not exceeding 380 mm.
High Tensile Wire
1.
Install fence with four strands of tension wire between end/corner post,
starting from bottom wire and up.
2.
Cut the fabric and attach each span independently at all terminal and
corner posts. Use each wire shall be stretched with 250LB (113kg) of
tension. Tension in the wire is maintained by permanent in-line stretchers
or tension springs.
Barbed Wire
Install barbed wire on gates to match that installed on the line fence. To
accommodate barbed wire, extend the end members of gates 300 mm above
the horizontal section of the gate frame. Space strands uniformly and attach to
frame with bands, clips, or eyebolts. Incline extension arms on line posts and
corner posts toward the property enclosed at approximately 45 degrees.
Stretch the strands of barbed wire to remove sag, and anchor firmly to
extension arms. Use 3 strands of barbed wire. Barbed wire will be installed on
sections of fence as indicated on the drawings or as directed by the Company.
H.
Installing Gates
1.
Install gates according to the locations and size indicated on the
drawings.
2.
Gates shall be properly braced and trussed to prevent sagging, buckling,
and weaving, and shall be covered with same type of fabric as the fence.
Vertical members of the gate shall carry the top of 3 strands of barbed
wire. Fixed end ratchet bands shall be furnished for fastening the barbed
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wire. Furnish gates with necessary fittings and hardware. Latches
provided for use with padlocks and hinges shall allow swing gates to
swing 180 degrees. Plunger bars shall have top, bottom, and middle
locking points with the middle point arranged for padlocking. Gates shall
have keepers that engage automatically when the gate is swung open.
I.
3.4
3.
Install gates plumb, level, and secure for the full opening without
interferences.
4.
Install ground items set in concrete in accordance with gate
manufacturer's recommendations. Inspect all parts and attachments for
defects; and install, lubricate, and adjust equipment to ensure smooth
operation.
Miscellaneous Installation
1.
Use U-shaped tie wires, conforming to the diameters of pipe, that clasp
the pipe and fabric firmly with ends twisted at least 2 full turns.
2.
Bend ends of exposed wires to minimize hazards to persons or clothing.
3.
Install nuts for fasteners on tension bands, and hardware bolts on the
side of the fence opposite the fabric. The ends of bolts, once secure and
checked for smooth operation, shall be peened to prevent removal of
nuts.
4.
Repair coatings damaged in the field with methods and techniques as
recommended by the manufacturer.
Grounding
A.
Fence
Fence shall be grounded at each side of every gate, at points 45 m each side
of overhead power-transmission lines, at intervals of every 300 to 450 m of
length when fences are located in isolated place, and every 150 to 225 m
when in close proximity (30 m or less) to public road, highways, and buildings.
Fence shall be grounded at location where the fence alignment changes more
than 15 degrees.
B.
Fence Posts
Each fence post to be grounded shall be connected to a ground electrode
consisting of a copper-clad steel ground rod 19 mm in diameter and 3 m long,
driven not less than 3.4 m into the ground with rod located at the fence line or
as near the fence line as is practicable. Connection of fence post to ground
electrode shall be made below grade with not less than No. 4 AWG strandedcopper wire with TW insulation by approved molded exothermic weld process
or approved clamp-type fitting on fence post and electrode. Each gate panel
shall be bonded with a flexible bond strap to its gate post.
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