3M 80610872675 User Manual
Displayed below is the user manual for 80610872675 by 3M which is a product in the Electrical Tapes category. This manual has pages.
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Tech Brief
CTI: The Comparative
Tracking Index Test
The Comparative Tracking Index
(CTI) is the maximum voltage,
measured in volts, at which a
material withstands 50 drops
of contaminated water without
tracking. Tracking is dened as the
formation of conductive paths
due to electrical stress, humidity,
and contamination.
The CTI test provides an
accelerated simulation of
conditions of surface discharges
and possible resulting tracking
and failure (typically a “short”)
in equipment using insulating
materials. This test also provides
a means to compare insulating
materials performances under wet
and contaminated conditions.
CTI requirements became
important to manufacturers after
the publication of the Underwriters
Laboratories document UL 1950
in March 1992. UL 1950 is the UL
Standard for Safety titled
“Information Technology
Equipment including Electrical
Business Equipment.” Section
2.9 of this document outlines
requirements for Creepage
Distance, which is the shortest
path between two conductive parts
measured along the surface of
the insulation.
Depending on the CTI of the insulating material used, the minimum
creepage distance required will vary. The higher the CTI value, the lower the
minimum creepage distance required. In practice, the higher the CTI of the
insulating material used, the closer two conductive parts can be. The result
is often a smaller part, increasingly desirable in technology and
industry today. These values would be of particular interest to design
engineers who must comply with UL requirements.
The original test method referred to in UL 1950 was IEC Publication 112. This
method requires a 3-mm thick sample*, subjected to a voltage, while one
drop of test electrolyte solution (0.1% ammonium chloride) falls every 30
seconds onto the sample surface. The test continues until either 50 drops
fall or tracking occurs. Failure results if tracking occurs before 50 drops fall,
generating enough amps to trip the tester’s built-in over-current relay. If the
*In order to meet the 3-mm thickness requirement, the electrical tapes must be carefully stacked
one layer upon another until the thickness is achieved.
sample burns the test is inconclusive
and should be repeated using a thicker
sample. The maximum test voltage is
600 volts; if failure occurs voltage is
typically decreased by 25 volts and the
test repeated until a voltage is reached
that the sample can pass.
The passing voltage must be repeated
for a total of ve test sites on the
sample. The sample must, in addition,
also pass 100 drops at 25 volts less than
the original passing voltage.
When all conditions are met, a
Material Group is determined for the
insulating material based upon the
passing voltage for the 50-drop test.
Both the backing and adhesive
sides of tapes are tested. Prior to
2008, the lower of the two voltage
levels determined the Material
Group assigned.
Material Groups are identied in UL
1950, Section 2.9:
(a) Material Group I 600 </= CTI
(b) Material Group II 400 </= CTI < 600
(c) Material Group IIIa 175 </= CTI < 400
(d) Material Group IIIb 100 </= CTI < 175
UL revised the requirements and references for Material Group
Classications after 2008, eliminating the Material Group IIIb rating.
The current notes regarding CTI Material Groups state the following in
the Online Certications Directory:
(a) Material Group I May be marked “Comparative Tracking Index (CTI) equal to
or greater than 600V, PLC=0, UL840 Material Group I, when
tested to IEC60112 on both sides of tape.
(b) Material Group II May be marked “Comparative Tracking Index (CTI) ) equal to
or greater than 400V but less than 600V, PLC=1, UL840
Material Group II, when tested to IEC60112 on both sides
of tape.
(c) Material Group IIIa May be marked “Comparative Tracking Index (CTI) equal to
or greater than 175V but less than 400V, PLC=2 or 3, UL840
Material Group IIIa, when tested to IEC60112 on both sides
of tape.
(d) Material Group IIIa May be marked “Comparative Tracking Index (CTI) 325(275)
on Adhesive side, UL840, Material Group IIIa and/or CTI 225
on Film Side, Material Group IIIa or equivalent when tested to
IEC60112, 4th Edition (2003).
UL Standard 840 Standard for Insulation Coordination Including Clearances
and Creepage Distances for Electrical Equipment. UL 746A is
referenced in UL840.
UL Standard 746A Standard for Polymeric Materials - Short Term Property
Evaluations.
The 3M Electrical Markets Division (EMD) Laboratory tested and
determined a CTI value for more than 50 Electrical Insulating Tapes from
3M. Underwriters Laboratory has tested 37 insulating and conductive tapes
from 3M to verify results. CTI testing at UL is optional.
UL added Material Groups assigned to the tapes tested at UL to the UL
Online Certications Directory. To see these references, go to
www.ul.com, then click on Online Certications Directory, and enter
E17385 into the search cell for UL File Number. Click on the link provided
there to nd a list of all EMD UL-Recognized tapes; CTI values are
indicated by subscripts (a, b, c, or d). Of the tapes tested, 3M qualied
34 for Material Group I rating, and UL qualied 24 of those, verifying
3M procedure and method.
3M™ Tape CTI Value
Material
Group (3M)
Material
Group (UL)
1600 I
5600 I
Super 10 600 I
11 600 I
12 600 I
16 600 I
Super 20 600 I
27 600 I
28 600 I
44 600 I
44D 600 I
44T-A 600 I
46 475 II
54 600 I
55 600 I
56 600 I
57 600 I
58 600 I
60 600 I
61 600 I
62 600 I
63 600 I
69 600 I
74 600 I
75 600 I
79 600 I
90 600 I
92 150 IIIb
MR94 600 I
MR94B IIIa
1205 125 IIIb
1276 600 I
3M™ Tape CTI Value
Material
Group (3M)
Material
Group (UL)
1291 600 I
1298 II
1312 600 I
1318B-1 200 IIIa
1318B-2 200 IIIa
1318W-1 450 II
1318W-2 450 II
1318Y-1 I
1318Y-2 600 I
44HT 600 I I
1318 Clear 600 I
1318-MW 600 I
1339 600 I
1350B-1 IIIa
1350B-2 IIIa
1350W-1 IIIa
1350W-2 IIIa
1350Y-1 II
1350Y-2 IIIa
1350F-B-1 IIIa
1350F-B-2 IIIa
1350F-W-1 IIIa
1350F-W-2 IIIa
1350F-Y-1 II
1350F-Y-2 IIIa
1350T-1 II
1351T-1 600 I
1351-1 600 I
1351-2 600 I
1554 600 I
1098-1 550 II
1098 Black 600 I
The following table shows results for current 3M OEM Electrical Insulating Tapes:
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Austin, TX 78726-9000 USA
Phone 800-676-8381
Fax 800-828-9329
Web www.3M.com/oem
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