3
Cold Shrink Silicone Rubber
Termination QT-III
7672-S-8-TOW/WOT
Instructions
IEEE Std. No. 48-1996
Class 1 Termination
69 kV Class 350 kV BIL
IEC 60840
72,5 kV
Kit Contents:
1 Silicone Rubber Lug Seal Insulator Assembly
1 Hi-K Stress Control Assembly
1 Silicone Rubber Insulator Assembly
1 Silicone Rubber Skirted Insulator Assembly
1 Pre-formed Ground Braid Assembly
3 Constant Force Springs
1 Roll Scotch® Electrical Shielding Tape 24
6 Tubes P55/R Red Compound (Non-Silicone Grease)
1 Roll Scotch® Sealing Mastic 2229, 1" (25 mm) wide
8 Strips Hi-K Mastic (1-6" × 22", 7-2" × 11")
1 Roll Scotch® Silicone Rubber Tape 70
1 Roll Scotch® Vinyl Electrical Tape Super 88, 1½" × 44'
1 6" (150 mm) Hi-K Mastic Pad
1 3M™ Cable Cleaning Pads CC-3
1 Copper Foil Tape Strip 1181, 15" long
4 Instruction Sheets
Note: Do not use knives to open plastic bags.
Kit Number
Primary Insulation
O.D. Range
Jacket O.D. Range
Conductor Size Range
AWG (mm2)
7672-S-8
1.94"–3.08"
(49.3–75.4 mm)
2.45"–3.35"
(62.2–85.1 mm)
250–1000
(120–500)
Table 1
3M™ Cold Shrink Silicone Rubber
Skirted Termination Kit QT-III
4APE/VER7IRE3HIELDED#ABLE
for Tape Over Wire and Wire Over Tape
Shielded Cable
7672-S-8-TOW/WOT
78-8126-9536-5-B
7IRE/VER4APE3HIELDED#ABLE
mCAUTION
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.
Correct Installation of Termination
3ILICONE2UBBER
3KIRTED)NSULATOR!SSEMBLY
!
"
(IGH+3TRESS#ONTROL-ASTIC
3EMI#ON)NSULATION3HIELD
!
3EMI#ON
)NSULATION
3HIELD
3ILICONE2UBBER
4UBULAR)NSULATOR
3ILICONE2UBBER
4UBULAR)NSULATOR
3ILICONE2UBBER
3KIRTED)NSULATOR!SSEMBLY
3ILICONE2UBBER
,UG3EAL4UBE
(IGH+3TRESS
#ONTROL4UBE
"
(IGH+3TRESS
#ONTROL-ASTIC
(IGH+3TRESS
#ONTROL4UBE
#
#
(IGH+3TRESS
#ONTROL-ASTIC
(IGH+3TRESS
#ONTROL4UBE
3ILICONE2UBBER
4UBULAR)NSULATOR
3ILICONE2UBBER
3KIRTED)NSULATOR!SSEMBLY
(IGH+3TRESS
#ONTROL-ASTIC
3ILICONE2UBBER
,UG3EAL4UBE
3ILICONE2UBBER
4UBULAR)NSULATOR
3ILICONE2UBBER
3KIRTED)NSULATOR
!SSEMBLY
78-8126-9536-5-B
I. Tape-Over-Wire Shield Cable
(For Wire-Over-Tape Shield, go to section II on page 8.)
Note: Check to insure all of the 3M™ Termination Assemblies QT-III will fit over the lug. If the lug will not fit through
the assembly cores, this termination can not be installed using this lug. Do not remove any of the cores at this time.
1.0Prepare Cable
1.1 Check to be sure the cable fits within the kit ranges as shown in Table 1.
1.2 Prepare cable using dimensions shown in Figure 1. Be sure to allow for depth of terminal lug plus 0.5"
(13 mm) plus crimp growth.
Note: Provide additional exposed conductor to allow for growth of aluminum lugs or connectors during crimping.
Conductor Size
250–350
400–650
750–1000
1100–2000
Growth Allowance
0.25" (6 mm)
0.5" (13 mm)
0.75" (19 mm)
Field Determined
Table 2
MM
MM
MM
MM
MM
3EMI#ON
#ABLE*ACKET
#ORRUGATED4APE3HIELD
Figure 1
78-8126-9536-5-B
$EPTH
OFLUG
MM
CRIMPGROWTH
)NSULATION
3HIELD7IRES
#ONDUCTOR
2.0Install Ground Braid Assembly
2.1 Select the pre-formed ground braid assembly from the kit. Pass the end of the cable through the ground braid
assembly loop, and position the ground braid assembly around the tape shield shown. (Figure 2)
3EMI#ON
#ORRUGATED4APE3HIELD
)NSULATION
3HIELD7IRES
#ABLE*ACKET%DGE
3OLDER"LOCK
'ROUND"RAID!SSEMBLY
Figure 2
2.2 Select the 3 constant force springs from the kit. Starting at the loop of the ground braid assembly nearest the
cable jacket edge, install the 3 constant force springs, one around each ground braid loop. Cinch (tighten) the
springs after wrapping the final turn. Extend the ground braid tails down the cable jacket. (Figure 3)
#ONSTANT&ORCE3PRING
#ABLE*ACKET%DGE
3OLDER"LOCK
'ROUND"RAID!SSEMBLY
Figure 3
78-8126-9536-5-B
2.3 Select the roll of 1" ( 25 mm) wide Scotch® Sealing Mastic 2229 from the kit. Cut a length of the tape long
enough to wrap around the cable jacket. Remove the release liner from the mastic and, using light tension, apply
a single wrap of mastic around the cable jacket, positioned under the ground braid solder blocks. (Figure 4)
Semi-Con
Constant Force Springs
Solder Block
1st Mastic Strip
(beneath solder blocks)
Figure 4
2.4 Cut four 1" (25 mm) lengths of 1" ( 25 mm) wide Scotch® Sealing Mastic 2229. Remove the release liner and roll
each mastic strip into a small roll. (Figure 5) Press the mastic rolls into place on either side of the ground braid
solder blocks. (Figure 6)
MM
-ASTIC3TRIP
-ASTIC2OLLED5P
Figure 5
Rolled Mastic (x4)
Solder Block
1st Mastic Strip
(beneath solder blocks)
Figure 6
78-8126-9536-5-B
Semi-Con
2.5 Select the roll of 1" (25 mm) wide Scotch® Sealing Mastic 2229 from the kit and cut a length of the mastic.
Using light tension, apply a single wrap of mastic around the cable jacket over the ground braid solder blocks
and the previously applied mastic. Bend wires back over applied sealing mastic. (Figure 7)
ND-ASTIC3TRIP
OVERSOLDERBLOCKSMASTICROLLS
Figure 7
2.6 Cut a third length of sealing mastic long enough to wrap over applied mastic and solder blocks. Remove the
release liner from the mastic and, using light tension, apply mastic over the shield wires and previously applied
mastic. (Figure 8)
2.7 Secure the shield wires and the two tails of the ground braid assembly to the cable jacket approximately
6 inches (150 mm) from the cable jacket edge with several wraps of vinyl tape. (Figure 8)
MM
APPROX
6INYL
4APE7RAP
RD-ASTIC3TRIP
OVERSHIELDWIRESPREVIOUSMASTIC
Figure 8
78-8126-9536-5-B
2.8 Wrap two half-lapped layers of highly-tensioned Scotch® Vinyl Electrical Tape Super 88 over the mastic seal
and constant force springs. Cover all exposed mastic, constant force springs and tape shield, overlapping 0.25"
(6 mm) onto the exposed cable semi-con. (Figure 9)
Note: Take care not to cover the exposed semi-con. A minimum of 2.5" (75 mm) of semi-con must be exposed.
/VERLAP3EMI#ON
MM
#ABLE*ACKET
6INYL4APE
Figure 9
2.9 Go to Step 5.0 Install Lug or Connector (page 13).
78-8126-9536-5-B
%XPOSED3EMI#ON
II. Wire-Over-Tape Shield Cable
3.0Prepare Cable
3.1 Check to be sure the cable fits within the kit ranges as shown in Table 1.
3.2 Prepare cable using dimensions shown in Figure 10. Be sure to allow for depth of terminal lug plus 0.5"
(13 mm) plus crimp growth.
Note: Provide additional exposed conductor to allow for growth of aluminum lugs or connectors during crimping.
Conductor Size
250–350
400–650
750–1000
1100–2000
Growth Allowance
0.25" (6 mm)
0.5" (13 mm)
0.75" (19 mm)
Field Determined
Table 3
MM
MM
MM
MM
MM
3EMI#ON
#ABLE*ACKET
4APE3HIELD
$EPTH
OFLUG
MM
CRIMPGROWTH
)NSULATION
#ONDUCTOR
3HIELD7IRES
Figure 10
78-8126-9536-5-B
4.0Install Ground Braid Assembly
4.1 Fold the shield wires back along the cable jacket. Select the pre-formed ground braid assembly from the kit.
Pass the end of the cable through the ground braid assembly loop, and position the ground braid assembly
around the tape shield as shown. (Figure 11)
3EMI#ON
)NSULATION
3HIELD7IRES
4APE3HIELD
#ABLE*ACKET%DGE
3OLDER"LOCK
'ROUND"RAID!SSEMBLY
Figure 11
4.2 Select the 3 constant force springs from the kit. Starting at the loop of the ground braid assembly nearest the
cable jacket edge, install the 3 constant force springs, one around each ground braid loop. Cinch (tighten) the
springs after wrapping the final turn. Extend the ground braid tails down the cable jacket. (Figure 12)
#ONSTANT&ORCE3PRING
#ABLE*ACKET%DGE
3OLDER"LOCK
'ROUND"RAID!SSEMBLY
Figure 12
78-8126-9536-5-B
4.3 Select the roll of 1" ( 25 mm) wide Scotch® Sealing Mastic 2229 from the kit. Cut a length of the tape long
enough to wrap around the cable jacket. Lift the ground braid tails and shield wires. Remove the release liner
from the mastic and using light tension, apply a single wrap of mastic around the cable jacket positioned under
the ground braid solder blocks and shield wires. (Figure 13)
#ONSTANT&ORCE3PRINGS
3OLDER"LOCK
ST-ASTIC3TRIP
BENEATHSOLDERBLOCKSSHIELDWIRES
3HIELD7IRES
Figure 13
4.4 Select the roll of 1" ( 25 mm) wide Scotch® Sealing Mastic 2229 from the kit. Cut a length of the tape long
enough to wrap around the cable jacket and previously applied mastic. Fold the ground braid tails out of the
way. Remove the release liner from the mastic and, using light tension, apply a single wrap of mastic around the
cable jacket, positioned over the shield wires and previously applied mastic. (Figure 14)
#ONSTANT&ORCE3PRINGS
ND-ASTIC3TRIP
OVERSHIELDWIRESPREVIOUSLYAPPLIEDMASTIC
3HIELD7IRES
Figure 14
10
78-8126-9536-5-B
4.4 Cut four 1" (25 mm) lengths of 1" ( 25 mm) wide Scotch® Sealing Mastic 2229. Remove the release liner and roll
each mastic strip into a small roll. (Figure 15) Press the mastic rolls into place on either side of the ground braid
solder blocks. (Figure 16)
MM
-ASTIC3TRIP
-ASTIC2OLLED5P
Figure 15
2OLLED-ASTICX
3OLDER"LOCK
ND-ASTIC3TRIP
BENEATHSOLDERBLOCKS
Figure 16
4.6 Cut a third length of sealing mastic long enough to wrap over applied mastic and solder blocks. Remove the
release liner from the mastic and, using light tension, apply mastic over the shield wires and previously applied
mastic. (Figure 17)
4.7 Secure the shield wires and the two tails of the ground braid assembly to the cable jacket approximately
6 inches (150 mm) from the cable jacket edge with several wraps of vinyl tape. (Figure 17)
MM
APPROX
6INYL
4APE7RAP
RD-ASTIC3TRIP
OVERSOLDERBLOCKSPREVIOUSMASTIC
Figure 17
78-8126-9536-5-B
11
4.8 Wrap two half-lapped layers of highly-tensioned Scotch® Vinyl Electrical Tape Super 88 over the mastic seal
and constant force springs. Cover all exposed mastic, constant force springs and tape shield, overlapping 0.25"
(6 mm) onto the exposed cable semi-con. (Figure 18)
Note: Take care not to cover the exposed semi-con. A minimum of 2.5" (75 mm) of semi-con must be exposed.
/VERLAP3EMI#ON
MM
#ABLE*ACKET
6INYL4APE
%XPOSED3EMI#ON
Figure 18
5.0Install Lug or Connector
5.1 Position lug/connector and crimp according to manufacturer’s directions. Remove excess oxide inhibitor and
sharp crimp flashing following crimping. Refer to page 19 for 3M lug/connector crimping information up to
1000 kcmil.
6.0Clean Cable Insulation and Lug Barrel Using Standard Practice
6.1 Use only aluminum oxide abrasive to finish and polish insulation surface.
6.2 Use abrasive only on cable insulation. Do not use on semi-con.
6.3 When using abrasive, do not reduce the cable insulation diameter below that allowed by the kit.
6.4 Wipe the cable insulation clean with an approved solvent. Do not allow the solvent to touch semi-con
insulation shield.
Note: Remove any remaining solvent with 3M™ CC-DRY Cable Cleaning Pads (not supplied with kit) or
lint-free cloth.
12
78-8126-9536-5-B
7.0Install Termination
7.1 Select the large hi-K mastic pad from the kit. Remove the liners and align the pad with 1" (25 mm) covering the
semi-con, and 5" (127 mm) covering the cable insulation. Using light tension, wrap the pad around the cable
insulation two times. Trim the pad to overlap the start by approximately 0.25" (6 mm). Taper the pad edge by
gently pressing along the edge with your finger. (Figure 19)
(I+-ASTIC0AD
3EMI#ON
#ABLE)NSULATION
MM
MM
(I+-ASTIC0AD
,AYERS
#ABLE)NSULATION
4APER%DGE
Figure 19
7.2 Wrap two half-lapped layers of highly-tensioned Scotch® Vinyl Electrical Tape Super 88 over the hi-K mastic
pad, leaving approximately 0.125" (3 mm) of mastic exposed at each end. Taper the exposed edges of the hi-K
mastic onto the cable by gently pressing along the edge with your finger. (Figure 20)
MM
3EMI#ON
4APER%DGEOF
(I+-ASTIC
MM
4APER%DGEOF
(I+-ASTIC
6INYL
4APE
Figure 20
78-8126-9536-5-B
13
)NSULATION
7.3 Starting 5" (127 mm) from the cut end of the insulation, apply 2 tubes of P55/R Red Compund (non-silicone
grease) over exposed insulation and vinyl tape-wrapped mastic pad. (Figure 21)
#OATWITH
022ED#OMPOUND
MM
Figure 21
7.4 Select the Stress Control Assembly (medium length tubular assembly on white core) from the kit. Slide the
Stress Control Assembly over the lug and cable with the loose core end toward the lug. Align the Stress Control
Assembly Tube (not the core) with the end of the tape shield, and remove the core by pulling the loose end
while unwinding counter-clockwise. Clean exposed cable insulation after installation. (Figure 22)
Unwind counter-clockwise
Align with step in semi-con
portion of insulation adapter tube
Cable Jacket
Stress Control Assembly
Figure 22
7.5 Select one 2' x 11" (50 mm x 280 mm) hi-K mastic strip from the kit. Remove the liners and wrap around the
end of the stress control assembly and cable insulation. Position the hi-K mastic so that half covers the stress
control assembly, and half covers the cable insulation. (Figure 23)
#ABLE)NSULATION
(I+-ASTIC
3TRESS#ONTROL!SSEMBLY4UBE
Figure 23
14
78-8126-9536-5-B
7.6 Wrap two half-lapped layers of highly-tensioned Scotch® Vinyl Electrical Tape Super 88 over the hi-K mastic,
leaving approximately 0.125" (3 mm) of mastic exposed at each end. Taper the exposed edges of the hi-K
mastic onto the cable by gently pressing along the edge with your finger. (Figure 24)
MM
MM
#ABLE)NSULATION
3TRESS#ONTROL
!SSEMBLY4UBE
4APER%DGEOF
(I+-ASTIC
4APER%DGEOF
(I+-ASTIC
6INYL
4APE
Figure 24
7.7 Select one or more of the 2" x 11" (50 mm x 280 mm) hi-K mastic strips from the kit. Remove the liner and
fold the mastic strip twice lengthwise to form a 0.5" (12 mm) wide strip. (Figure 25)
2EMOVE,INER
(I+-ASTIC
-ASTIC&OLDED
/VER4WICE
Figure 25
7.8 Wrap the mastic strip around the exposed conductor between the cable insulation and lug. Build the mastic up
to the insulation O.D. (Figure 26)
$OUBLED/VER
(I+-ASTIC
Figure 26
78-8126-9536-5-B
15
7.9 Apply additional wrap(s) of hi-K mastic (not folded) onto the cable insulation for 1" (25 mm) and taper the hiK mastic 2" (50 mm) onto the lug barrel. (Figure 27) When using a tapered barrel lug, extend the hi-K mastic
onto the barrel 2" (50 mm) past the tapered part of the barrel. (Figure 27)
MM
MM
MM
MM
(I+-ASTIC
4YPICAL,UG
4APERED,UG
Figure 27
7.10 Select the roll of Scotch® Silicone Rubber Tape 70 from the kit. Using moderate tension, wrap 2 half-lapped
layers of tape over the hi-K mastic, leaving approximately 0.125" (3 mm) of mastic exposed at each end.
Taper the exposed edges of the hi-K mastic onto the cable by gently pressing along the edge with your finger.
(Figure 28)
MM
#ABLE)NSULATION
3TRESS#ONTROL
!SSEMBLY4UBE
MM
4APER%DGEOF
(I+-ASTIC
4APER%DGEOF
(I+-ASTIC
3COTCH¤3ILICONE2UBBER4APE
Figure 28
7.11 Apply 1 tube of P/55R Red Compound (non-silicone grease) 2" (50 mm) over the lug seal area and onto the
cable insulation for approximately 4 inches (100 mm). (Figure 29)
#OATWITH
022ED#OMPOUND
3TRESS#ONTROL
!SSEMBLY4UBE
MM
MM
Figure 29
16
78-8126-9536-5-B
7.12 Select the Silicone Rubber Lug Seal Insulator from the kit. Slide the lug seal insulator onto the cable insulation
with the loose core end toward the cable insulation. Position the lug seal insulator (not the core) 2" (50 mm)
onto the lug barrel. Remove the core by pulling the loose core end while unwinding counter-clockwise.
(Figure 30)
5NWINDCOUNTERCLOCKWISE
MM
3TRESS#ONTROL!SSEMBLY4UBE
,UG
3ILICONE2UBBER
,UG3EAL)NSULATOR
Figure 30
7.13 Apply 3 tubes of P55/R Red Compound to the exposed cable insulation and hi-K stress control assembly tube.
Fill the bottom edge of the silicone rubber lug seal the the P55/R Red Compound. Do not apply P55/R Red
Compound to the surface of the lug seal insulator. (Figure 31)
Coat with
P55/R Red Compound
Stress Control
Assembly Tube
Fill step
with P55/R
Red Compound
Figure 31
78-8126-9536-5-B
17
Lug Seal
Assembly
Tube
DO NOT
GREASE
3M is a trademark of 3M Company.
Scotch is a registered trademark of 3M Company.
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application. You assume all risks and liability associated with such use. Any statements related to the product which are not contained in
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upon, in writing, by an authorized officer of 3M.
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This product will be free from defects in material and manufacture for a period of one (1) year from the time of purchase. 3M MAKES NO
OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE. If this product is defective within the warranty period stated above, your exclusive remedy shall be, at 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
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