3M™ Cold Shrink QT-III Silicone Rubber Indoor
Tubular Termination Kit
With High-K Stress Relief
For Tape Shield, Wire Shield and UniShield® Cable
7622-T-110, 7623-T-110, 7624-T-110, 7625-T-110,
7626-T-110
Instructions
IEEE Std. No. 48
Class 1 Termination 15 kV Class
110 kV BIL
F CAUTION
Working around energized systems may cause serious injury or death. Installation should be performed by personnel familiar with good safety practice in handling electrical equipment. De-energize and ground all electrical systems before installing product.
September 2014 |
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78-8113-5099-6 Rev E |
1.0 Kit Contents
3 High–K, Tracking Resistant, Silicone Rubber Terminations
3 Pre-formed Ground Braids
3 Constant Force Springs
3 3M™ EMI Copper Foil Shielding Tape 1181 Strips, 1/2" x 10"
6 Strips Scotch® Mastic Strip 2230 (black with white release liners, bagged) 1 3M™ Cable Cleaning Preparation Kit CC-2
1 Instruction Sheet
Note: Do not use knives to open plastic bags.
Kit Selection Table
NOTE: Final Determination Factor is cable insulation diameter.
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Primary Insulation |
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Conductor Size Range (AWG & kcmil) |
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Kit Number |
O.D. Range |
Jacket O.D, Range |
5 kV |
8 kV |
15 kV |
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7622–T–110 |
0.64" – 1.08" |
0.97" – 1.48" |
4/0 – 400 |
3/0 – 300 |
2 – 2/0 |
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(16,3 – 27,4 mm) |
(24,6 – 37,7 mm) |
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— |
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— |
(35 – |
70 mm2) |
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7623–T–110 |
0.72" – 1.29" |
1.04" – 1.60" |
300 |
– 500 |
250 |
– 500 |
2/0 – 300 |
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(18,3 – 32,8 mm) |
(26,4 – 40,6 mm) |
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— |
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(70 – 150 mm2) |
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7624–T–110 |
0.83" – 1.53" |
1.12" – 1.87" |
500 |
– 750 |
350 |
– 700 |
4/0 – 500 |
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(21,1 – 38,9 mm) |
(28,4 – 47,5 mm) |
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— |
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(120 – |
240 mm2) |
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7625–T–110 |
1.05" – 1.80" |
1.39" – 2.40" |
700 – 1500 |
600 – 1250 |
500 |
– 1000 |
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(26,7 – 45,7 mm) |
(35,2 – 61,0 mm) |
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(240 – |
500 mm2) |
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7626–T–110 |
1.53" – 2.32" |
1.84" – 2.80" |
1750 |
– 2000 |
1500 |
– 2000 |
1250 – 2000 |
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(38,9 – 58,9 mm) |
(46,7 – 71,1 mm) |
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— |
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— |
(625 – 1000 mm2) |
Table 1
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78-8113-5099-6 Rev E |
2.0 Instructions for Tape Shielded Cable
Prepare Cable
2.1Check to be sure cable size fits within kit range as shown in Table 1.
2.2Prepare cable using dimensions shown in Figure 1. BE SURE TO ALLOW FOR DEPTH OF TERMINAL LUG. If necessary to prevent tape shield from unrolling, hold down edge with a single wrap of 3M™ EMI Copper Foil Shielding Tape 1181.
NOTE: Provide additional exposed conductor distance to account for growth during crimping of ALUMINUM lugs or connectors as follows:
Aluminum Lug |
2 - 350 |
400 - 650 |
750–1000 |
1250 - 2000 |
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and Connector |
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1/4” (6 mm) |
1/2” (13 mm) |
3/4” (19 mm) |
Field determined |
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Growth Allowance |
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NOTE: It is imperative to remove all remnants of the semi-con layer, even if the semi-con layer comes off as one layer. There should not be any remaining black areas, or particles, on the cable insulation layer.
Jacket Removal Length |
Depth Of Terminal Lug + Growth Allowance |
9" (229 mm) |
3" (76 mm) |
1-1/2" (38 mm) |
Semi-Con |
Tape Shield |
Cable Jacket |
Figure 1
3.0Install Ground Braid
3.1Select a Scotch® Mastic Strip 2230 from kit and remove white release liners. Using light tension, apply a SINGLE
WRAP of mastic around the cable jacket 1/4" (6 mm) from cut edge (Figure 2). Cut off excess.
1/4" (6 mm) |
Semi-Con |
Tape Shield |
1st Scotch® Mastic Strip 2230 |
Cable Jacket |
Figure 2
78-8113-5099-6 Rev E |
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3.2Position pre-formed ground braid with short tail over tape shield directly adjacent to cable jacket cut edge. PLEASE NOTE: The ground braid needs to make full contact with the metallic tape shield. Position long tail of ground braid, extending over cable jacket with solder block over mastic strip (Figure 3). Secure ground braid to cable jacket 4-1/2" (114 mm) from cable semi-con edge using vinyl tape (Figure 3).
NOTE: Position vinyl tape with care, it also serves as a marker for positioning the termination.
4-1/2" (114 mm)
Semi-Con Edge
Tape Shield
Ground Braid
Cable Jacket Edge
Solder Block
1st Scotch® Mastic Strip 2230
Vinyl Tape Marker
Figure 3
3.3Wrap ground braid around cable tape shield one complete wrap, trim excess to prevent overlap and secure in place with constant force spring. Wrap spring in same direction as ground braid (Figure 4). Cinch (tighten) the spring after wrapping the final winding.
3.4Select second Scotch® Mastic Strip 2230 from kit and remove white release liners. Apply a second SINGLE WRAP of mastic over solder block on ground braid and previously applied mastic (Figure 4). Cut off excess.
Constant Force Spring Tape Shield
Ground Braid Trim 1st Scotch® Mastic Strip 2230
Solder Block
2nd Scotch® Mastic Strip 2230
Ground Braid Leg
Cable
Tape
Shield
Figure 4
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78-8113-5099-6 Rev E |
3.5Wrap two highly stretched half-lapped layers of electrical grade vinyl tape around Scotch® Mastic Strip 2230, constant force spring and exposed tape shield (Figure 5).
NOTE: Take care not to cover exposed semi-con insulation shield. A minimum of 1" (25 mm) must be exposed.
SPECIAL NOTE FOR CLOTH OR PAPER SEMI-CON INSULATION SHIELD
In cables with cloth or paper semi-conductive shields, it is recommended the shield be over wrapped with one halflapped layer of highly stretched semi-conductive rubber tape, such as Scotch® Electrical Semi-Conducting Tape 13.
Semi-Con |
Tape Shield |
Constant Force Spring |
Two Half-Lapped Layers of Electrical Grade Vinyl Tape |
Scotch® Mastic Strip 2230 |
Vinyl Tape Marker |
Figure 5
4.0 Install Lug or Connector
Important Packaging Notice
In order to make sure that you receive an undamaged termination, this 3M™ Cold Shrink QT-III Termination is packed with a RED SHIPPING CORE inside of the white core. Please remove the red shipping core BEFORE you install the termination. This shipping core can be recycled with other polypropylene waste.
4.1Check to insure 3M™ Cold Shrink QT-lll Silicone Rubber Termination assembly fits over the selected lug or connector. If lug or connector. (Figure 6) will not fit through the termination core, clean the insulation (per Step 5.0) and slide termination on cable before installing lug or connector. DO NOT REMOVE CORE AT THIS TIME.
Clearance |
Connector/Lug |
Figure 6
NOTE: Refer to pages 17 – 19 for 3M Connector and Lug crimping information.
NOTE: For Aluminum Conductors - Thoroughly wire brush conductor strands to remove aluminum oxide layer. Insert conductor into lug or connector and then remove conductor. This will transfer some of the antioxidant compound onto the conductor. Wire brush the anti-oxidant paste into the strands. Immediately insert conductor into lug or connector barrel as far as it will go.
NOTE: Die/crimper head rotation between consecutive crimps is RECOMMENDED.
4.2Position connector or lug and crimp according to manufacturer's directions. Remove excess oxide inhibitor and sharp crimp flashings following crimping.
5.0Clean Cable Insulation and Lug or Connector Barrel Using Standard Practice
5.1Wipe the cable insulation with one of the solvent saturated pads from the 3M™ Cable Cleaning Preparation Kit CC-2.
DO NOT ALLOW SOLVENT TO TOUCH SEMI-CON INSULATION SHIELD!
5.2If abrasive must be used:
a.Use on insulation only. DO NOT USE ABRASIVE ON SEMI-CON INSULATION SHIELD!
b.Use only aluminum oxide abrasive; grit 120 or finer, included in 3M Cable Cleaning Preparation Kit CC-2.
c.Be careful not to reduce the cable insulation diameter below that allowed by the kit.
78-8113-5099-6 Rev E |
5 |
6.0Install Termination
6.1Slide the termination body onto the cable and remove core. Make sure the termination body (not the core) is butted
up to the edge of the vinyl tape marker previously applied (Figure 7). Pull the core while unwinding, counterclockwise, starting with the loose end (Figure 7). Be sure to alternate the pulling and unwinding actions (pull- unwind-pull-unwind-etc.) to help prevent the core material from binding up as the core is being removed.
NOTE: Once the termination body makes contact over the mastic seal area, there is no need to continue supporting the assembly. Do not push or pull on the termination assembly while unwinding the core.
Counterclockwise
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NOTE: The material being removed at this step is mixed polymers |
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Vinyl Tape Marker |
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and can be recycled. |
Figure 7
6.2Connect ground braid to system ground according to standard practice.
Correct Installation of Termination on Tape Shielded Cable |
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Vinyl Tape |
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Marker |
Ridge at End of Cable |
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Insulation Shield (Semi-Con) |
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Ridge at End |
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of High-K Tube |
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Semi-Con Insulation Shield |
Cable Insulation |
Environmental Top |
Stress Controlling Compound |
Conductor |
Seal |
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High-K Stress |
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Relief Tube |
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78-8113-5099-6 Rev E |