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ASTM D470 PDF

Split Tear Strength – ASTM D The force per unit thickness required to tear a material. Test specimens are placed in a tensile test machine. The jaws are set. This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D-9 on. Electrical. ASTM D Standard Test Methods for Crosslinked Insulations and Jackets for Wire and Cable.

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Immersing the sample in hot water for a few minutes just prior to pulling off the jacket often facilitates this procedure.

ASTM D470 – 13

Average all the readings taken at each temperature. The height of the segment is the thickness of insulation on the side from which the slice is taken.

Measure the voltage with an electrostatic voltmeter or, in the case of the rectifying equipment, with suitable low-voltage indicators, provided the latter are so c470 that their indications are independent of the test load. Heat Distortion Test At the end of this 1 h period, place the aztm directly under the foot of the micrometer and allow it to remain in the oven under load for 1 h. Weigh the specimen to the nearest 1 mg and designate this as C.

If both such second specimens pass this test, the lot of cable except the length which was rejected because of failure of the? One test specimen shall be taken from the? Likewise, the elongation is based on the original distance between the gage marks applied to the specimen before immersion in the oil. We use cookies to make our website easier to use and to better understand your needs.

ASTM D – 13 Standard Test Methods for Crosslinked Insulations and Jackets for Wire and Cable

Thermal tests provide useful data for research and development, engineering design, quality control, and acceptance or rejection under speci? The set zstm the difference between this length and the original 2-in. If the jacket cannot be removed, prepare specimens by buffing. Therefore, tests are done on insulated or jacketed wire or cable in these test methods solely to determine the relevant property of the insulation or jacket and not to test the conductor or completed cable. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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Distortion 5 [T1 2 T2! Control the temperature by keeping the apparatus in an air-conditioned room or by partially immersing the chamber in a water bath, either connected to a hot-and-cold water system or provided with thermostatically controlled electric heaters. Equip the buffing apparatus with a cylindrical aatm arranged so that it can be advanced very gradually.

The test specimen shall be taken either from the cable in process or from the completed cable. Precision and Bias NOTE 1—Resistor values in microammeter shunt will vary with the meter used and with the concentration scale qstm. Cool in a dessicator to room temperature. If necessary, obtain the values from a table giving the areas of segments of 4d70 unit circle for the ratio of the height of the segment to the diameter of the circle.

Excessive size results in greater delay in obtaining the desired ozone concentration. This test provides useful data for research and development, engineering design, quality control, and acceptance or rejection under speci? Thoroughly instruct all operators in the proper way to conduct tests safely. Discard the solution after one week and prepare fresh solution. When making high voltage tests, particularly in compressed gas or in oil, the energy released at breakdown may be suff? Then open the two-way stopcock on the buret to the air and?

Determine the tensile strength and elongation at the same time that the original properties are determined see Section The test voltage is permitted to be of either polarity. NOTE 5—The selection of the cable insulation level to be used in a particular installation shall be d40 on the basis of x470 applicable phase-to-phase voltage and the general system category as outlined in the following paragraphs: The tracking voltage is the voltage at which no failures occur on?

Remove the outer braid, together with adhering compound, from a 6-in. From this specimen, remove the tape applied before crosslinking. Failure occurs when the circuit breaker trips. Add iodine directly to the solution in the weighing tube on the balance pan until the total iodine in solution is about 0.

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ASTM D – 05 Standard Test Methods for Crosslinked Insulations and Jackets for Wire and Cable

The current generated in the photoelectric cell 4d70 ampli? This permits easy access to the interior and also the inspection of specimens, without opening the chamber during test. NOTE 8—These thicknesses are based on unipass construction. Control the pressure by the degree of closure of the discharge cock.

Apply a to V dc potential between the two electrodes. It is also possible to facilitate the removal of the insulation by stretching the conductor to the breaking point in a tensile-strength machine. Hold the cable during bending operations in such a way that it cannot revolve around its own axis. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Introduce the ozonized air from the generator to the space below this?

Bend one specimen in the direction and plane of the existing satm of the cable around a mandrel and through the speci?

Direct Measurement with an Ozonometer No testing is necessary for manufacturing lots smaller than 10 ft. This test provides data for research and development, engineering design, quality control, and acceptance or rejection under speci?

Do not heat, immerse in water, or subject the specimens to any mechanical or chemical treatment not speci? For specific hazards see Section 4.

In most cases a test specimen which is an entire section is obtained, free from surface incisions and imperfections. Weigh the specimen to the nearest 1 mg, and designate this weight as A. After generating the ozone for at least 15 min, make a check on the percentage of ozone concentration see