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3M
Cold Shrink QT-III Silicone
™
Rubber Three Core Inverted
Skirted Termination with High-K
Stress Relief
For 3-Conductor Type "G" (Ground Wire),
Copper Tape Shield, Armored Cables
7620-S-INV-3G and 7690-S-INV-3G Series
Instructions
IEEE Std. No. 48
Class I Termination
25/28 kV Class Rated
150 kV BIL - 7620-S-INV-3G Series
200 kV BIL - 7690-S-INV-3G Series
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.
*Picture is representative of the 3M Cold Shrink QT-III Termination 7690 Series.
The 7620 Series terminations will have only 2 skirts.
October 2016
78-8124-5866-5-E
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Summary of Contents for 3M Cold Shrink QT-III 7620-S-INV-3G Series
- Page 1 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. *Picture is representative of the 3M Cold Shrink QT-III Termination 7690 Series. The 7620 Series terminations will have only 2 skirts. October 2016...
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Page 2: Kit Contents
® (1) Roll Scotch Electrical Shielding Tape ® (3) 3M EMI Copper Foil Shielding Tape 1181 Strips - 1/2" x 10" (1) 3M Cable Cleaning Preparation Kit CC-2 (1) Instruction Sheet NOTE: Do Not use knives to open plastic bags. -
Page 3: Prepare Cable
Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief 2.0 Prepare Cable Determine cable jacket removal length required for correct phase spacing and bolted terminal lug connections ([A] + [B] Figure 1; based on the longest phase to be connected). Allow for dimension [C] as needed. NOTE: Individual phase length and separation dimensions vary according to specific installation and equipment design requirements. - Page 4 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief 3.0 Install Shield Grounding Braid Assembly & Re-route Cable Ground Wire(s) Position ground braid assembly over cable with assembly connector aligned to edge of armor (Figure 2). Note: For single ground wire cables, apply assembly to side opposite cable ground wire.
- Page 5 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief Measure distance [J] (Figure 3). Retrieve previously removed cable jacket material. Cut a straight piece to dimension [J] and wrap it around cable phases beneath ground strap assembly and cable ground wire. Secure jacket section in place using Scotch Vinyl Electrical Tape Super 88 (wide vinyl tape) (Figure 3).
- Page 6 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief Fill one armor valley section with tightly-wrapped layers of Scotch Electrical Shielding Tape 24 (Figure 4). ® Secure ground braid assembly to cable armor using large constant-force spring (Figure 4). Once spring has been applied, cinch (twist with hand) to tighten.
- Page 7 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief Bind cable ground wire with four half-lapped layers of Scotch Vinyl Electrical Tape Super 88 (wide vinyl tape) ® (Figure 5). Limit width of tape wrapping to approximately 2-1/2" (63,5 mm). 2-1/2"...
- Page 8 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief 3.11 Wrap two strips of Scotch Mastic Strip 2230 (one on top the other) over cable jacket. Locate the mastic strip ® directly under the shield braid solder block and ground wire (Figure 8). Note: It will be necessary to temporarily remove vinyl tape over ground braid tail to complete this step.
- Page 9 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief 3.13 Apply one strip of Scotch Mastic Strip 2230 around ground wire strands (Figure 10). Apply one mastic seal ® strip around solder block section of ground braid tail. Align seal strip wraps with previously applied mastic band around cable jacket.
- Page 10 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief 3.16 Install cold shrink jacket extension assembly. Align the jacket seal tube (not the plastic support core) to overlap ground wire seal area by approximately 1/4" (6 mm). To install, pull loose core end, while unwinding counterclockwise around the cable.
- Page 11 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief 4.0 Install Silicone Rubber Breakout Boot Assembly Inspect breakout boot assembly and confirm that all loose plastic core ends are free as shown (Figure 13). Loose Core Ends Neck Core Loose Core End...
- Page 12 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief 5.0 Install Silicone Rubber Rejacketing Sleeves Place a vinyl tape marker on each cable phase leg at dimension [X] (Figure 14). Note: [X] = A + [B]. Allow for crimp growth when using aluminum lugs. Determine required rejacketing sleeve length for each phase leg (Distance [S], Figure 14).
- Page 13 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief Guide one rejacketing sleeve assembly over each cable phase leg (Figure 16). Push sleeve assembly from above. Continuously guide the free end while maintaining sleeve-to-cable-core alignment. Right Wrong Figure 16...
- Page 14 ™ with High-K Stress Relief 6.0 Install 3M Cold Shrink QT-III Termination Assemblies Prepare cable phase legs according to dimensions shown (Figure 18). NOTE: It is imperative to remove all remnants of the semi-con layer, even if the semi-con layer comes off as one layer.
- Page 15 Secure rejacketing sleeve with two half-lapped layers of electrical grade vinyl tape (Figure 20). Start taping 0.75" (19 mm) over rejacketing sleeve, extend 0.25" (6 mm) over cable metallic shield and return to starting point. Note: Do not exceed 0.25" (6 mm) overlap on 3M EMI Copper Foil Shielding Tape 1181 strip. ™...
- Page 16 3. Be careful not to reduce the cable insulation diameter below that allowed by the kit. e. Wipe the cable insulation and lug using a solvent wipe from supplied 3M Cable Cleaning Preparation Kit CC-2, or an approved cable cleaner/solvent, AND ALLOW IT TO DRY BEFORE INSTALLING TERMINATION.
- Page 17 Cold Shrink QT-lll Silicone Rubber Three Core Inverted Skirted Termination ™ with High-K Stress Relief Install Tubular 3M Cold Shrink QT-III Silicone Rubber Termination assemblies. ™ a. Remove the inner red shipping core from the termination assembly by pulling and unwinding the loose red core end.
- Page 18 3M's option, to replace or repair the 3M product or refund the purchase price of the 3M product. Except where prohibited by law, 3M will not be liable for any direct, indirect, special, incidental or consequential loss or damage arising from this 3M product, regardless of the legal theory asserted.
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