2015_Fence_IDIQ_ApendixE _Ref_ESE-SIT-0001 TYPE_A_Modified_Fence_PD .doc

APPENDIX E

ESE-SIT-0001

AIR FORCE LIFE CYCLE MANAGEMENT CENTER

AIR FORCE MATERIEL COMMAND

HANSCOM AIR FORCE BASE, MASSACHUSETTS

STANDARDIZED ELECTRONIC

SECURITY EQUIPMENT

SITING AND DESIGN GUIDANCE

FOR

PERMANENT INSTALLATIONS

FORCE PROTECTION SYSTEMS

25 JANUARY 2013

Document #: TEST-SITINGCRIT-004 (25JAN13) Authenticated by:

Date:

PATRICK E. DAGLE

Chief

Force Protection Branch, AFLCMC/HBU

Hanscom AFB, MA 01731-2100

THIS DOCUMENT SUPERSEDES ESE-SIT-0001, DATED 4 NOVEMBER 2011.

DISTRIBUTION STATEMENT C - Distribution authorized to U.S. Government agencies and their contractors for Administrative and Operational Use, 25 January 2013. Other requests for this document shall be referred to AFLCMC/HBU, Force Protection Branch, 3 Eglin Street, Bldg. 1612, Hanscom AFB, MA 01731-2100.

2.5

ELECTRICAL GROUNDING, BONDING AND SHIELDING

The effective grounding, bonding and shielding of the electronic security equipment is a vital part of system design and shall provide for personnel safety, equipment and facility protection, and electronic noise reduction. General requirements for grounding, bonding and shielding are contained in the Unified Facilities Criteria (UFC) and the Military Handbooks referenced within the UFC and NFPA 70 (NEC). The design engineer shall ensure that proper grounding, bonding, and shielding is provided to all security equipment.

2.5.1 Grounding. The ground system is comprised of four subsystems: earth electrode and lightning protection, surge protection, fault protection and signal reference subsystems.

2.5.1.1 Earth Electrode Subsystem. The earth electrode subsystem provides a path of low resistance to earth for lightning and power fault currents. General lightning protection requirements can be referenced within NFPA 780 “Standard for the Installation of Lightning Protection Systems.”

2.5.1.1.1 Ground Rod. The core of the earth electrode system for electronic equipment is a series of connected ground rods. The ground rod shall be copper clad galvanized or stainless steel, a minimum of 10 ft in length, and shall not be less than 3/4 inch in diameter The ground rod shall be installed vertically with the top at least 12 inches below grade. The ground rod shall be connected to the system with a #2 AWG copper wire. The resistance to earth should not exceed 10 ohms for any ground rod location supporting an electronic sensor. Where 10 ohms cannot be obtained due to high soil resistivity, rock formations, etc., additional ground rods may be required and shall be spaced apart no more than twice the length of the rod (MIL-STD-188-124B). Other alternate methods for reducing the resistance to earth shall only be used with Government approval. For additional information on alternate methods, as well as test procedures, see MIL-HDBK-419A. Ground resistance shall be determined by testing.

2.5.1.1.2 Perimeter Fence. Perimeter animal control or security fences shall be grounded for personnel safety. Sensored fences shall be grounded, as minimum, in accordance with the sensor manufacturer’s recommended instructions. At a minimum, all fences shall be grounded according to the following requirements. Fences with no electronic security equipment will be grounded with ground rods at intervals no more than 500 ft. All fences will be grounded on each side of all gate openings, at each corner, end post, or change in fence direction, at points 150 ft on each side of high tension wiring crossings, and at the closest approach to any building located within 50 ft of the fence. For all fences, bond a #2 AWG copper wire to the fence post, bottom steel tension wire, and ground rod. Bonding shall be accomplished in accordance to MIL-HDBK-419A. Ground wire will be bonded to posts and ground rods by exothermic welding or brazing. Hinged gates are to be bonded to gateposts. Care should be taken to ensure each bend in the copper cable is gradual and is no less than a radius of 8 inches. The angle of any bend should not be less than 90 degrees. The fence to earth ground should not exceed 10 ohms. Non-electronic, sensored fences may be grounded to 25 ohms.

2.6

SECURITY SENSOR-COMPATIBLE FENCE REQUIREMENTS

The following paragraphs are intended to provide the security system designer, engineer or fencing contractor with a comprehensive reference for the sensor-compatible fence specification for electronic security sensors. Experience in the fielding of these systems has demonstrated that conventional fence installation practices must be supplemented in several key areas to achieve the desired minimum performance standards. Refer to attached drawing FPB-ASSY-SC02-01R0C0, Sheets 1-5 for illustration of a Fence, IDS Sensor Platform used to support a fence sensor installation. (NOTE: Softcopy drawings in CAD format can be obtained from: AFLCMC/HBU, Force Protection Branch, 3 Eglin Street, Hanscom AFB, MA.) The following guidance is intended to represent minimum requirements, and apply in part or in total to systems and subsystems identified in the remainder of this document. Specific sections should be referenced to ensure all sensor equipment requirements are considered.

If Anti-Ram Cabling is to be used in conjunction with the fence, the anti-ram cable shall not affect the fence sensor performance. The anti-ram cable shall be taut to ensure no movement in normal environmental conditions. The anti-ram system shall not add any nuisance alarms to the sensor. The anti-ram system shall not be able to be used as a climbing aide.

2.6.1 Fence Sensors. Requirements specified herein are necessary for acceptable performance of approved security sensor systems for new and existing fences. Proper sensor performance is contingent on both the condition of the fence and proper installation practices. Further information on sensor use and installation are provided in other sections of this document.

2.6.2 Fence Standards. To assist the using and installing agencies in the proper design of sensor compatible security fences (referred to as Fence, IDS Sensor Platform), the Force Protection Branch has prepared standard drawings for Fence, IDS Sensor Platform construction, which are shown in attached drawing FPB-ASSY-SC02-01R0C0, Sheets 1-5 and Source Control Drawing FDTA155. (NOTE: Softcopy drawings in CAD format can be obtained from: AFLCMC/HBU, Force Protection Branch, 3 Eglin Street, Hanscom AFB, MA) 2.6.3 Fence Materials. Fence, IDS Sensored Platforms shall use materials conforming to Federal Specification RR-F191 series and the following specified components:

2.6.3.1 Chain Link Fabric (PL1 Nuclear and PL1 and Below). All fence fabric shall comply with Federal Specification RR-F191 series (Chain Link Fence Fabric) with standard 2( square mesh, 9 gauge aluminized steel wire, minimum 7 foot height, one selvage is knuckled, the other, twisted. The twisted selvage should be at the top of the fence, with the knuckled selvage at the bottom. The Type II, aluminum-coated steel wire shall be used for permanent security applications, since it is less likely to require re-tensioning due to wear at a later date. Use of zinc-coated (galvanized) wire is acceptable for existing fences, and may be used for short-term applications otherwise Type II, aluminum-coated steel wire is required.

2.6.3.2 Posts and Rails. Shall be round components and comply with Federal Specification RR-F191 series (Chain Link Fence Posts, Braces and Rails). Tables 2-1 and 2-2 provide required fence component sizes and strengths. Gateposts should be designed to support the gates proposed. Minimum requirements are given in FS RR-F191/3D. Gateposts supporting hardware for swing, rolling, cantilever or lift gates must also be isolated from fabric carrying posts. Gateposts shall be a minimum of 4” outer diameter (O.D.) and be sized according to Table 2-1. Corner, end and pull posts shall be of adequate height to accept barbed wire terminations. The overall height of these posts, when fitted with cap dome and anti-tamper spike shall be equal to the height of the line posts with the vertical outriggers. The fence system shall be designed and installed so that the distance between corner, end and pull post in any continuous fence run, do not exceed 100 meters.

TABLE 2-1. Fence Components

TABLE 2-2. Physical Dimensions and Properties for Fence Pipe

4”

6”

8” 4.500”

6.625”

8.625” .237”

.280”

.322” 30,000

30,000

30,000

2.6.3.3 Fittings. All post caps, barbed wire outriggers, tension/stretcher bars (3/16" x 3/4"), brace bands, tension bands, hinges and other fittings shall be pressed steel and galvanized. Aluminum fittings are not authorized.

2.6.3.4 Tension Wire. Three (3) tension wires shall be used in the standard fence design. The wires shall be stretched taut to help support the tension of the fence fabric and pass the tests identified in paragraph 2.6.5; in order to achieve success in these tests tension wires shall be tensioned to 500 pounds. The top tension wire shall be approximately 7.5 inches below the top of the fabric. The other two tension wires shall be located at approximately 31 and 56½ inches down, respectively, from the top of the fence fabric. All tension wires shall be galvanized 7 gauge hardened steel spring wire. Tension wires shall be connected to corner, end and pull posts and will be limited to zone length. One end of each wire shall be secured to an appropriately sized brace band and the other with a turnbuckle. The tension wires shall be connected to the brace bands and turnbuckles using double barrel swages. If tension wires are spliced, swages shall be used.

2.6.3.5 Fasteners. Fabric shall be firmly secured to line posts and rails with 9 gauge galvanized steel tie wire. Firmly secure fabric to tension wires with 9 gauge aluminized steel wire ties. The use of hog rings or aluminum wires of any gauge are not permitted.

2.6.3.6 Footings.

a.

PL1 and Below. All footings shall be designed to sustain the projected lateral forces and point loads. The sizes in Table 2-3 are given as a minimum. Individual site conditions including soil strength, wind and ice loading on the fabric and sensors will affect footing size. Consideration shall be allotted for radial loads imposed by curved horizontal alignments. Concrete footings will be cylindrical utilizing concrete column forms and will extend, as a minimum, to the depths identified in Table 2-3 or the depth calculated using the International Building Code (IBC) sections 1804 and 1805 and the UFC 3-301-01 (Reference FPB-ASSY-SC02-001R0C0 SHEET5), whichever is greater, at all locations; when the frost line equals or exceeds the concrete footing depth identified from the calculations described above the footing shall extend a minimum of 3” below the frost line.

TABLE 2-3. Concrete Footing Requirements

Line

Pull 12”

18” 4’-0”

4’-0”

b.

PL1 Nuclear. All footings shall be designed to sustain cold weather temperatures at the local area frost depth. Foundations for Line Posts, End Posts, Corner Posts Pull Posts, and Gate Posts shall be installed to a minimum depth of 7’6” or the depth calculated using the IBC sections 1804 and 1805 and the UFC 3-301-01 (Reference FPB-ASSY-SC02-001R0C0 SHEET 5), whichever is greater, in concrete formed using concrete column forms of the same diameters identified in Table 2-3.

c.

Concrete. The strength of all concrete footings shall be no less than 3000 psi. The concrete shall be mixed, transported, handled and placed in accordance with Unified Facilities Guide Specification, Division 03 Concrete, Section 03 30 00 Cast-In-Place Concrete. The top of the post-footings shall be finished so that at the post the concrete is 1/2” to 1” above grade and sloped 1/2" down to the footing edge.

2.6.3.7 Outriggers. The IDS sensor platform shall be configured with vertical outriggers, unless the VTW-400 sensor system is intended to be used (Reference section 15 of this document) and shall have no top rail. “Y” outrigger configuration may be used only if directed and approved by the Government and if this occurs, the specification shall be provided by the Government. Vertical outriggers require fabrication to include caps to fit the fence posts, breakaway cutouts, support-notches for barbed wire, and an anti-climbing spike. An example of an outrigger is shown in Figure 2-1 and fabrication dimensions can be found in the attached Source Control Drawing FDTA155. Vertical outriggers will be 37 ½” measured from the top of the post cap with an anti-climb spike extending another 5” at the top. Corner, pull, end and gate posts shall be equipped with top cap domes with an anti-climb spike.

2.6.3.8 Barbed Wire. The barbed wire shall be 4-point, 15.5 gauge high tensile barbed, with 5" Barb Spacing and a minimum breaking load of 950 lbs. The barbs located within 4” of the outriggers shall be removed. Barbed wires will pass through the vertical outrigger notches and be connected to corner, end or pull posts and will be limited to zone length. Barbed wire shall be secured to pull, end, and corner posts using brace bands with a ratchet tensioner at one end and a turnbuckle at the other (Reference FPB-ASSY-SC02-001R0C0 SHEET 4). The barbed wire shall be secured using swages. If barbed wire requires splicing, swages shall be used. All barbed wire shall be tightened to 50-70 pounds upon installation and then adjusted appropriately at sensor installation. After the barbed wire is appropriately tightened for the sensor, the barbed wire shall be secured to all the vertical outriggers with 6” long, double-looped, 18 gauge stainless steel twist ties with the twists on the secure side of the outriggers.

2.6.4 General Installation Requirements.

Installation standards for fences used to support security sensors exceed those required for standard chain link or cyclone fence installation. Installers are expected to comply with detailed instructions and testing requirements to create successful sensor platform fences.

2.6.4.1 Alignment. Fence alignment and layout become critical when marked changes of horizontal and vertical direction occur. The ideal security system platform fence is absolutely straight and level between any two vertical and horizontal points. Changes of direction that produce an angle of less than 65° on the secure side or unsecure side of the fence shall be avoided. If a situation arises where a smaller angle may occur, Government approval is required.

2.6.4.2 Fabric Attachment. Fabric shall be installed twisted selvage up and knuckled selvage down. The fabric shall extend below the bottom rail enough to have at least the first row of complete diamonds partially below the bottom rail and shall not touch the grade or concrete footings. It will be anchored to prevent intruders from lifting the fabric and creating an opening greater than 5”. Fabric shall be securely fastened using materials specified in 2.6.3.5 according to the following spacing:

All ties will be twisted at least three (3) complete turns and be terminated on the secure (interior) side of the fabric. The ties shall be twisted to restrict any movement of the fence fabric at the contact point of the tie, fence fabric, tension wire, posts and rails. If possible, ties will cross two pickets at a knuckle. If not, the picket closest to the pipe or wire will be tied. The ties on line posts shall be placed 14” O.C. and a tie shall be placed within 4 inches from the top and bottom of the fabric. Fence fabric to line post wire ties shall be installed so that twisted ends are parallel to the fabric. All other fabric wire ties shall be installed so that the twisted ends are perpendicular to the fabric.

2.6.4.3 Fence Posts and Rails. Bottom rails are required with all sensored fences. Sensored fences do not contain a top rail. The top rail must be removed from existing fences. All bottom rails shall be a single continuous piece from post to post braced with in-line bottom rail clamps (boulevards) except at corner and end posts where bottom rail end caps with brace bands will be used.

Post caps and outriggers shall be tack welded or riveted to posts to prevent movement. Also brace bands at corner, pull, end, and line posts shall be tack welded prior to fabric placement to prevent bands from shifting. Welds shall be corrosion treated with galvanized paint.

Brace assemblies are required to counteract lateral forces and shall be located at each corner, end and pull post. In some cases, two braces will be required in a single panel. The configuration and installation shall be in such a way that the test requirements in paragraph 2.6.5 are met.

All fence bolted hardware shall have the threaded ends on the secure side of the fence to prevent tampering.

2.6.4.4 Signs. Signs shall not be installed on the sensored fence. If required, ensure signs are securely fastened to a separate post or an animal control fence.

FIGURE 2-1. Vertical Outrigger 2.6.5 Testing and Quality Control.

2.6.5.1 Visual Inspection. Prior to conducting strength tests, all new and existing chain link fences intended for use as security sensor platforms shall be visibly inspected for:

· loose or broken fabric

· loose posts

· broken, loose or missing ties

· proper tie spacing

· broken post or rails

· loose or missing hardware

· cracked or broken foundation concrete

· corrosion

· missing tack welds

· inadequate bracing and trusses

· out-of-plumb posts and fabric

Particular attention should be given during the testing portion of the inspection to any areas identified by this visual inspection. All broken or missing parts (including concrete) shall be replaced prior to conducting the tests described below.

2.6.5.2 Tests. Prior to sensor installation, the following tests shall be performed to determine the acceptability of the fence for sensor installation. Tests shall not be conducted when the ground is frozen nor when the ambient air temperature is below 40°F.

2.6.5.2.1 Post Rigidity Test. All posts shall be tested by applying a 50 lb. Force to the post at a height of 5 ft. above the ground from the base of the post and the results recorded. The post shall not deflect more than 1/2" at the point of application of the force. If deflection exceeds 1/2", the post shall be removed and a new post installed. Posts must be capable of resisting projected lateral forces as determined by the security system engineer and/or fencing contractor. Replace posts not achieving minimal acceptable requirements.

2.6.5.2.2 Fabric Deflection Test. All fence fabric panels shall be tested for integrity and capability for use with the sensor system. The test shall be conducted by applying 30 lbs of pull on the fabric and then 30 lbs of push at a point midway between the posts and at 5’ above grade. The deflection shall not exceed 2 inches from the "at-rest" position. The tension on the fabric when this is achieved will be about 1000 pounds. If the deflection exceeds this amount, the connections between the fabric and posts, rails, and top wire shall be checked to ensure that the fabric is attached to the bottom rails by appropriate ties at intervals not exceeding 12 inches and to the posts in at least five equally spaced locations to include the top and bottom of the fabric. If these requirements are not satisfied, new ties shall be installed at the proper interval and the test performed again. If the deflection still exceeds the allowable, the fabric shall be re-tensioned and ties installed per these specifications.

SECTION 2 DRAWING ATTACHMENTS

FPB-ASSY-SC02-01R0C0, Sheets 1-5 Source Control Drawing FDTA155

QA CHECKLIST – FENCE RUN INSTALLATION

Project:

Location:

DATE

Correct Depth is _______ inches.

System is ready to test.

QA MANAGER

DATE

FOR OFFICIAL USE ONLY