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3.3Cable Family

A group with multiple conductor sizes having the same conductor strand coating, insulation formulation, and wall thickness type.

3.4Coated Wire

Wire comprised of a given metal covered with a relatively thin application of a different metal. (ASTM

B 354)

3.5Conductor

A wire or combination of wires not insulated from one another, suitable for carrying an electrical current. (ASTM

B 354)

3.6Conductor Size

See “SAE Conductor Size”.

3.7Core

One of the components in an assembly. A component may be an uninsulated conductor, an insulated conductor, a twisted pair, a shielded assembly, a coaxial cable, or any finshed cable.

3.8Fluid Compatibility

The ability of a cable to resist the effects of various fluids found in surface vehicles.

3.9Hot Plate

An electrically heated device used to test thermoset cables.

3.10Low Voltage (Low Tension)

Usually considered to be ≤ 60 V DC (25 V AC).

3.11Minimum Wall (Thickness)

The lowest allowable insulation thickness at any point.

3.12Nominal

A suitable approximate value used to designate or identify a component.3.13Plastics

Any of numerous polymeric materials that are usually thermoplastic or thermosetting, of high molecular weight and that can be molded, cast, extruded, drawn, laminated, or otherwise fabricated into objects, powders, beads, films, filaments, fibers, or other shapes. (ASTM F 1251)

3.14Primary Cable

The single or multi-stranded, single conductor, insulated cable used to carry electric current, by attachment to the low voltage side of an ignition coil in surface vehicles.

3.15Resistance to Ozone

The ability of a material to withstand the deteriorating effect of ozone (surface cracking). (Dictionary of Materials and Testing)

3.16SAE Conductor Size

A system that indicates the cross sectional area of the conductor. The Metric SAE Conductor Size is the approximate area of the conductor.

3.17Separator

A thin layer used as a barrier to prevent mutually detrimental effects between different components of a cable such as between the conductor and insulation or between the insulation and the sheath. (IE C, Electricity, Electronics and Telecommunications, Multilingual Dictionary)

3.18Strip Force

The peak axial force required to overcome the adhesion between the conductor and the insulation.

3.19Strand

See wire.

3.20TCR, Temperature Class Rating

A class designation based on the retention of “Mechanical Properties” (tensile & elongation) after 168 h of heat aging at 30 °C above the temperature class rating.

3.21Thermoplastic

A plastic capable of being softened by heating and hardened by cooling through a temperature range characteristic of the plastic and, in the softened state, capable of being repeatedly shaped by flow into articles by molding, extrusion or forming. (IE C, E lectricity, E lectronics and Telecommunications, Multilingual Dictionary).

6.11Crosslinking

The usage of this test will be established by agreement between customer and supplier. 25 mm of insulation shall be removed from each end of a 600 mm sample of finished cable. The test sample shall be bent a minimum of 135 deg around a 6 mm mandrel. The cable and mandrel shall be placed against

a hot plate at least 150 mm by 150 mm which has been preheated to 250 °C ± 25 °C. A force of 5 N to

7 N shall be applied for 5 s to 6 s without rubbing or scraping the cable on the plate. After exposure, the cable conductor shall not be visible through the insulation. If the visual inspection is not conclusive, the sample is to be returned to room temperature and then subjected to a dielectric test similar to that specified in 6.4. However, the immersion time and application of the voltage shall be 1 min. The requirements for the “Crosslinking” test, if any, will be established by agreement between the supplier and the customer.

6.12Strip Force

The usage of this test will be established by agreement between customer and supplier. Prepare a 75 mm test sample of finished cable. 25 mm of insulation shall be cleanly cut and carefully stripped from one end of the conductor. Care must be taken not to disturb the 50 mm ± 2 mm section when removing the residual insulation. No burrs are permitted on the ends of the metallic conductor. Insert the stripped end through a plate with an appropriate diameter hole. The conductor shall be pulled through the plate at a rate of 500 mm/min. The maximum force shall be recorded. A minimum of four readings shall be obtained. The mean of all readings shall determine the strip force of the cable under test. The requirements for the “Strip Force” test, if any, will be established by agreement between the supplier and the customer.

Alternative - A 25 mm ± 2 mm sample of undisturbed insulation may be used.

6.13Resistance to Hot Water

This test is for initial qualification only. The usage of this test will be established by agreement between customer and supplier. Compliance for a cable family may be demonstrated by using “Representative Conductor Sizes for Testing”, see 4.5. 25 mm of insulation shall be removed from each end of two 2.5 m ± 0.1 m test samples of finished cable. Other test sample lengths may be used; however, in case of a dispute, the referee method shall use the 2.5 m test sample length. Closely wind a minimum of three complete turns of the first test sample around the mandrel specified in Figure 5 and secure the coil as shown in Figure 14. After removing the mandrel, immerse the first test sample in a saltwater bath with 10 g/l of NaCl in distilled water at 85 °C ± 5 °C. To avoid interaction between compounds, test samples with different insulating compounds shall not be tested in the same bath. Also, a virgin saltwater bath shall be used for each test. Connect one end of the first test sample to the positive terminal of a 48 V DC power source. Connect the negative terminal to the copper electrode in the bath. After 7 days, disconnect the 48 V DC power source, measure the insulation resistance, and calculate the “Insulation Volume Resistivity” (see 6.14). This completes one cycle. Repeat this procedure for a total of five cycles, 35 days. After conditioning, remove the test sample from the bath, allow it to cool to room temperature, and make a visual inspection of the insulation. Ignore any damage caused by the tie, which secures the coils. If no exposed conductor is visible, perform the “Dielectric” test (see 6.4) except the voltage will be applied after immersion in the salt solution for a minimum of 10 min.

Perform the entire procedure for the second test sample with the polarity of the 48 V DC power source reversed.

Where:

ρ0 is the “Insulation Volume Resistivity”, expressed in Ω•mm L is the immersed length of the test sample, expressed in mm R is the measured insulation resistance, expressed in Ω

D is the outside cable diameter, in accordance with 5.3, expressed in mm d is the conductor diameter, expressed in mm log is log to the base 10 The “Insulation Volume Resistivity” shall not be less than 109 Ω•mm. 6.15 Temperature and Humidity Cycling

This test is for initial qualification only. The usage of this test will be established by agreement between customer and supplier. Compliance for a cable family may be demonstrated by using “Representative Conductor Sizes for Testing”, see 4.5. 25 mm of insulation shall be removed from each end of two 600 mm samples of finished cable. Wind the test sample around the mandrel according to 5.5 and secure the ends. Condition the sample according to the temperature and relative humidity shown in Figure 15. The “Temperature Class Rating” is shown in Figure 6. Extended transition times may be used as long as the dwell times at temperature are maintained. The cycle begins with the sample at -40 °C ± 2 °C and uncontrolled relative humidity. Completion of the schedule shown in Figure 15 will constitute one cycle. Repeat the cycle for a total of 40 cycles. While still on the mandrel, remove the test sample from the chamber, allow it to stabilize at room temperature for 30 min, and unwind it from the mandrel. Make a visual inspection of the insulation. Ignore any damage caused by the ties, which secure the ends. If no exposed conductor is visible, perform the “Dielectric” test (see 6.4) except the voltage will be applied after immersion in the salt solution for a minimum of 10 min.

8.Notes

8.1Marginal Indicia

The change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report.

PREPARED BY THE SAE CABLE TASK FORCE OF THE

SAE ELECTRICAL DISTRIBUTION SYSTEMS STANDARDS COMMITTEE

R. E. Carroll, Inc.

Citgo Petroleum

Kester Solder

Glowe Industrial Sales, Inc. Single Roll - 25 -下载本文