Installation Safety & Handling Recommendations for fiber optic cable.pdf

7/28/2019 Installation Safety & Handling Recommendations for fiber optic cable.pdf

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ADSS CableInstallation Saety & Handling Recommendations

Table o Contents1.0 Scope and Purpose ........................ 1

2.0 Reerences ......................................13.0 Saety............................................... 14.0 ADSS Stringing Methods ............. 15.0 Precautions..................................... 16.0 Installation Equipment ................ 27.0 Cable Hardware.............................. 28.0 Stringing Procedures .................. 39.0 Pulling ADSS ................................. 410.0 Sagging.......................................... 411.0 Clipping and Deadending ............ 412.0 Damper Installation..................... 4

13.0 Splicing ......................................... 4

1.0 Scope & PurchaseThis guide provides general recommendations orthe selection o methods, equipment, and tools orthe stringing o Draka Comteq ADSS (All DielectricSel-Supporting) ber optic cables includingezSpan and Long Span ADSS cables. The installationmethods or Drakas ADSS cables are essentially thesame as those used or installing power utilityconductors. The IEEE Guide to theInstallation o Overhead Transmission LineConductors will provide additional relevant

inormation about installation practices.

Questions? Call 1-800-879-9862

2.0 ReerencesIEEE Standard 524-1992, Guide to the Installation oOverhead Transmission Line Conductors.IEEE 1993 National Electrical Saety Code.immediately.

3.0 SaetyAll saety practices o the Power Utility and theInstallation contractor must be ollowed. Thesesaety procedures take precedence over any inormation

contained in this document.

4.0 ADSS Stringing MethodsThe Stationary Reel method is recommended toinstall ADSS cable. This method requires the cablereel to be stationed at one end o a pull with thetake-up reel at the other end. A pull line isthreaded through travelers using a p-line o

matched weight and diameter. Once the p-line isthreaded and all the travelers are balanced/tied up,

the ADSS cable is attached to the p-line using awoven wire pulling eye and the take-up mechanismcan start the pull. The ADSS cable must be pulledthrough the travelers under tension to preventdamage rom minimum bending radius violations.The Moving Reel method is not recommended orADSS installation because pulling tensions andloading on the hardware are uneven. Also, it isdicult to keep constant tension on the cable inthe tangent travelers between dead-end points.Uneven tensions can cause damage to the jacketand create minimum bending radius violations.ADSS cable distribution and transmission lineinstallations are similar. Transmission lines require

more precautions i the line voltage is 230 kV orgreater and grounding o the travelers may berequired. Another concern is the distance rom thelive conductors at the attachment point on thestructure. Standard utility precautions should beused i the length o the ber optic dead-endreaches close to the region o the conductor.

5.0 Precautions & SaetyCare must be taken to avoid damage to ADSS cableduring handling and placing. It is critical to observethe cable specied minimum bending radius andmaximum pulling tensions. Precautions must betaken to avoid sharp bends or exceeding the

recommended tensions.Cable reels should be transported in an uprightposition, on the fanges only. Never lay the cablereel on its side. Inspect the reel fanges and ensurethe inner suraces do not contain any splinters ornicks that could damage the cable jacket whenpaying o.Saety devices such as guard poles or mid-spanpulleys need to be installed or protection at allpublic roadways, utility lines, and railroad crossings.I crossing distribution lines, those lines need tohave temporary insulators installed. Survey the cableroute beore starting to ensure it is clear oobstructions, including ences and walls. Do notallow cable to drag over obstructions.

2512 Penny Road, Claremont, North Carolina 28610-0039 USA / International +1 828.459.9787

The Draka policy o continuous improvement may result in changes to procedures without prior notice.Issue Date12.9.2008 / INSTALL022

Draka|Cabling or the real world. www.drakaamericas.com [email protected] 800.879.9862

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6.0 Installation EquipmentGrips and Pulling Eyes:Chinese nger type pullingeyes are recommended to attach the cable to thepulling line.

Travelers (Sheaves, Pulleys): The travelers must havea sot neoprene or similar material liner to cushion the

cable rom the bare metal o the traveler. The liner orinsert must be smooth and show no signs o wear andtear. It is unacceptable or a traveler to have sectionso cushion missing or worn through at the bottom othe groove.

damage to the ripcords, armor, buer tubes, and fbers.7.0 Cable Hardware7.1 Fiber Optic TangentFiber Optic Tangent: Used as cable suspensionhardware only on spans less than 350 eet whenthe angle o change, either horizontal or vertical,is less than 15. The tangent clamp is designed tohold the cable in the air at the pole without

gripping the cable as with a suspension (describedbelow). The tangent is designed to allow the cableto slip through the unit at a tension imbalancegreater than 400 pounds. There are severaldierent approved suppliers o the tangenthardware, each with dierent designs. Pleasereer to Draka or recommendations o theadvantages/disadvantages o each or yourapplications.

7.2 Armor Grip Suspension (AGS)Armor Grip Suspension (AGS): Used or any spanlength with an angle change, either horizontal or

vertical, less than 30. An AGS Suspension shall beused or in-line structures i the span is greaterthan 350 eet.

7.3 Fiber Optic Dead-endsFiber Optic Dead-ends: Used in several instances.A dead-end is installed at each end o the cablelength to attach to the structures. Two deadendsare used at angle changes o 30 or greater, eitherhorizontal or vertical. I the structures are in-linebut have a vertical dierence greater than 20,deadends shall be used to distribute the cablethrough the incline/decline.

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Pulling Rope: The pulling rope must be well matchedto the cable diameter and cable weight. This willbetter prepare the travelers in the system to balancethe load as the cable is pulled and allow the cable toride in the bottom o the traveler groove.

Tensioner: A bull wheel tensioner with a brake is

recommended or an ADSS installation.

Puller with sucient pull rope capacity: The pullershould be equipped with a brake to keep constanttension o the cable as it is being installed.

Figure 1. Fiber Optic Tangent

Figure 2. AGS Suspension

Figure 3. Fiber Optic Deadend


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8.0 Typical Stringing OperationsProcedures8.0 Installation Equipment SitesInstallation Equipment Sites: It is important topick proper locations or the pay-o and take-upequipment. The ADSS cable reel (pay-o) must be

located directly in line with the rst traveler andmust be back rom the structure our times theheight o the traveler (4:1 distance to heightratio). It is recommended to have at least threestructures beore the rst large angle change. Theequipment and ADSS cable reel should be in a saeand secure location, worry-ree rom vandalism orthet since the equipment could sit overnight.

8.1 Traveler InstallationTraveler Installation: Each structure in the pullingsegment must have a traveler installed and apulling rope threaded (reeved) through it. Eachtraveler must be balanced so that the rope, and

the ollowing ADSS cable, ride at the bottom othe neoprene inserts groove. It is important to tieup the traveler at each angle so the pulling ropeand ADSS cable enter and exit the travelersmoothly (See Figures 4 and 5 at right). I thecable enters at an angle, it increases the chance ojumping rom the traveler groove into spacebetween the traveler and the yoke holding thetraveler to the pole. This would cause severedamage to the cable.

8.3 Pulling LinesPulling Lines: Once the travelers are installed,the pulling rope shall be threaded (reeved) through

the system. It is extremely important that thepulling rope and the ADSS cable have the samediameter and approximate weight. This will allowthe travelers to foat at the same level with thepulling rope as they will when the ADSS cableenters the travelers. The pulling line should be alldielectric and not susceptible to internal,electrical static charge build up. The pulling ropeshould never be allowed to drape over distributionlines or slump between pole attachments. Itshould have constant tension throughout theoperation.

Figure 4. Incorrect Traveler

Figure 5. Correct tie up o Traveler

Tie up Rope

Cable

Cable


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9.0 Pulling ADSSThe ADSS cable shall be attached to the pulling ropeusing a double swivel eye and woven wire grip. Thedouble swivel eye insures the ADSS cable will notsee induced torque as the pulling line enters andexits each traveler. A fag shall be attached justbehind the swivel eye on the ADSS cable jacket.

This fag should stay straight through each traveler.I the fag starts to fip over the cable, it shows theswivel eye is not working properly and the pullingoperation should be stopped and oil or x theswivel. The woven wire grip shall be o sucientlength on the cable jacket to insure even loading othe cable strength members. The edges o thewoven wire grip should be taped smooth so the gripdoes not damage the neoprene inserts

10.0 SaggingThe ADSS cable shall be sagged rom the pay-o(cable reel) end and work back toward the take-upequipment starting with the deadend at the rst

structure near the cable reel. The sag can beadjusted using several methods. The recommendedmethod is the line o site method. This requiresthe sag distance to be determined ahead o time oreach particular span length. One or more spansbetween deadend locations should be checked usingthis method.Line o Sight sagging method requires climbingboth structures on either side o a span to bechecked. The structure closest to the pay-o endo the system is deadended. Then the nextstructure is marked using bright colored tape withthe appropriate mid-span distance rom theattachment height. The lineman returns to the payo

end structure and measures down the mid-spansag distance and places his line o site at that sameheight. This person should have radio contact withthe take-up operator and give instructions o howmuch to tighten the cable in the system so that thebottom o the sag o this particular span rises to matchthe bright colored tape mark on the oppositestructure. Once the sag matches the requirement,the take-up side deadend structure can be climbedand clipped in. The bottom o the sag shall always bebrought up to the proper sag, not loosened or broughtdown to the correct sag.There are two methods o pulling the cable back tothe structure to deadend it. A deadend can be

partially installed to supply a pulling loop, or anaramid yarn braided pulling eye may be used. It isnot acceptable to use a hoist or clamping device atmid-segment to temporarily pull cable.


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11.0 Clipping-in andDeadendingThe system segment shall rst be sagged anddeadended at the appropriate structures. Thedeadends shall have a sucient drip loop betweentwo deadens on a structure to allow ree movement.The deadends shall be attached to the structure

using an extension link (Draka recommendsusing at least a 12 extension link) in order to getproper distance rom the structure to allow the driploop. The drip loop should be positioned downwardand at least 12 deep. Next the AGS Suspensions andTangents can be installed. The installing o thesuspension hardware, i.e. Deadends, Tangents andAGS Suspensions shall be prompt. The ADSS cableshall not be allowed to sit in the travelers morethan one week without approval rom Draka.Grounding the suspension hardware is thechoice o the owner o the system. Transmissionline installations typically ground the hardware ateach pole, while distribution installations typically

dont use grounding. Reer to Draka orurther recommendations or a particular project.

12.0 Damper InstallationI the system requires Aeolian vibration dampers,they can be installed ater the suspension hardwareis in place at each individual structure. Dampersare generally needed only i the installation tensionexceeds 15% o the cable breaking strength and ispan lengths exceed 350 eet. Please reer to Drakai there is concern about a potential vibration situation.

13.0 Splicing

Splicing should be preormed on the ground. Thesplice can then be stored aerially (recommend atleast 18 eet o the ground), at ground level inpedestal or cabinet, or underground in a hand holeor manhole. Sucient length o cable ends shouldallow the cable to descend the structure and entera splicing vehicle. Each splice should have at leasta small storage loop to allow the splice to be movedrom the base o the pole i the splicing vehicle cannot be located close by. Twenty eet o cable shallbe discarded rom each pulling grip end to removedamaged or stressed cable. Then typically, eachcable end should have at least 50 eet discardedrom the deadend attachment.

Cable Down Guides should be used to attach theADSS cable to the structure along the entire pole height.CAUTION:Care must be taken not to cut into the buer tubes whenscoring the inner jacket. Keep the center o the cable asstraight as possible and avoid bending the buer tubes atsharp angles, which can break fbers.

Installation Safety & Handling Recommendations for fiber optic cable.pdf

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