Cut Sheet

3M™
Cold Shrink QT-III Silicone Rubber Skirted Termination Kits,
7620-S, 7680-S and 7690-S Series
10 of 14
Engineering/
Architectural
Specifications
Terminating of all 5, 8, 15, 25/28 and 35 kV shielded power cables, indoors and in
weather-protected equipment shall be performed in accordance with instructions
included in the 3M™ Cold Shrink QT-III Silicone Rubber Skirted Termination Kits 7620-S,
7680-S and 7690-S Series. This shall include all outdoor weather-exposed areas for
Tape (ribbon), Wire or UniShield
®
shielded cables. The termination kits shall be used in
conjunction with 3M™ Scotchlok™
Copper Compression Lugs, 30000 and 31000 Series,
3M™ Scotchlok™
Copper/Aluminum Compression Lugs, 40000 Series, or 3M™ Stem
Connectors SC Series.
Product
Specifications
The 3M™ Cold Shrink QT-III Silicone Rubber Skirted Termination Kits, 7620-S,7680-S
and 7690-S Series cable terminations must have a voltage class rating equal to or
greater than the cable being terminated. The rating shall be 5, 8, 15, 25/28 or 35 kV as
an IEEE Standard 48 Class 1 termination. It must have a maximum continuous
operating temperature rating of 221°F (105°C), with an emergency overload rating of
284°F (140° C). The termination stress control shall be capacitive and constructed of a
High-K EPDM rubber tube. The installation procedure shall not require using silicone
grease.
The termination insulator shall be of a skirted design, constructed of tracking resistant
silicone rubber, dark gray in color. The termination must be of a pre-stretched Cold
Shrink design, installed without the application of a heat source. The termination kit shall
include all materials required (except lug and vinyl tape) and shall accommodate Tape
(ribbon), Wire, or UniShield
®
shielded cables. The Class 1 termination kits shall be used
with listed copper or aluminum compression lugs.
Performance Tests
Typical Results, IEEE Standard 48 Short-Term Test Sequence
Insulation Class Test
5 / 8 kV (2 Skirt) 15/25 kV (4 Skirt)
35 kV
(8 and 12 Skirt)
Require-
ments
Results
Require-
ments
Results
Require-
ments
Results
Partial Discharge
Extinction voltage @ 3 pC
7.5 kV Passed 13 / 21,5 kV Passed 30 kV Passed
Power Frequency Voltage
1 min. Dry Withstand
35 kV Passed 50 / 65 kV Passed 90 kV Passed
Power Frequency Voltage
10 sec, Wet Withstand
30 kV Passed 45 / 60 kV Passed 80 kV Passed
Power Frequency Voltage
6 hr. Dry Withstand
25 kV Passed 35 / 60 kV Passed 76 kV Passed
Direct Voltage
15 min. Dry Withstand
65 kV Passed 75 / 105 kV Passed 140 kV Passed
Lightning Impulse
Voltage Withstand (BIL)
95 kV Passed 110 / 150 kV Passed 200 kV Passed
Partial Discharge
Extinction Voltage @ 3 pC
7.5 kV Passed 13 / 21.5 kV Passed 30 kV Passed