STATE STANDARD

UNION SSR

GALVANIZED STEEL WIRE FOR AIR

LINES OF COMMUNICATION

TECHNICAL CONDITIONS

GOST 1668-73

Official edition

IPK PUBLISHING STANDARDS Moscow

STATE STANDARD OF THE UNION OF THE SSR

ZINCED STEEL WIRE FOR OVERHEAD COMMUNICATION LINES

Specifications

Steel zinc-coated wire for aerial lines. Specifications

Introduction date 01.01.75

This standard applies to steel wire intended for wires of overhead communication lines.

1. MAIN PARAMETERS AND DIMENSIONS

1.1. The wire is produced depending on the brand of wire rod: cuprous - M,

ordinary; by manufacturing accuracy: normal accuracy, high accuracy - P;

depending on the surface density of zinc of two classes:

1st class - 1,

2nd class - 2.

1.2. The diameter of the wire and the maximum deviations along it must correspond to those indicated in table. one.

Table 1

1.3. The ovality of the wire (the difference between the largest and smallest diameter of one section) should not exceed the limit deviations in diameter.

Legend Examples

Linear wire with a diameter of 4.00 mm, ordinary, high accuracy, 1st class:

Wire 4 P-1 GOST 1668-73

Official Edition ★

Reprint prohibited

© IPC Standards Publishing House, 1998 Reissued with Changes

Linear wire with a diameter of 4.00 mm, copper, normal accuracy, 2nd class:

Wire 4 M-2 GOST 1668-73 1.1-1.3 (Changed edition, Amendment No. 3).

2. TECHNICAL REQUIREMENTS

2.1. The wire must be manufactured in accordance with the requirements of this standard according to the technological regulations approved in the prescribed manner, from wire rod according to the normative document.

2.2. The mechanical properties of the wire must comply with the standards specified in Table. 2.

table 2

Notes:

1. The manufacturer guarantees that the mechanical properties of the wire with a diameter of 2.5-6.0 mm comply with the standards given in Table. 2 of this standard, after 20 days from the date of manufacture.

2. In the first two days from the moment of heat treatment, it is allowed for the manufacturer to accept wire with a diameter of 2.5-6.0 mm with a tensile strength of at least 330 MPa (34 kgf / mm 2).

2.3. The zinc coating on the wire must be continuous, without gaps and cracks visible without the use of magnifying devices.

Separate influxes of pink cannot serve as a basis for rejection.

Minor scratches, dents, individual roughness of the zinc coating, as well as non-uniformity of the wire surface in color, white spots, sparkles and white deposits in the form of adhering zinc oxide are allowed if the coating withstands the number of immersions indicated in Table. 3.

2.4. The adhesion of the zinc coating to the steel base must be strong. The zinc coating should not crack and peel off when the wire is spirally wound with eight tight turns on a cylindrical rod with a diameter indicated in Table. Behind. Surface dust-like peeling of the zinc coating on coiled samples of galvanized wire is not a rejection sign.

Table For

Nominal wire diameter, mm

Ratio of rod diameter to wire diameter

From 1.5 to 3.00 incl. St. 3.00 * 6.00 *

2.5. The surface density of zinc and the number of immersions for 60 seconds in a solution of copper sulfate must comply with the standards specified in table. 3.

Table 3

2.6. The specific electrical resistance of the wire at a temperature of plus 20 ° C should not exceed:

cuprous - 0.146 Ohm mm 2 / m;

ordinary - 0.138 Ohm mm 2 / m.

By agreement between the manufacturer and the consumer, the electrical resistivity of the wire should not exceed:

cuprous - 0.138 Ohm mm 2 / m;

ordinary - 0.130 Ohm mm 2 / m.

The norms of the highest permissible values ​​​​of electrical resistance of 1 m of wire are given in appendices 1, 2 and 3.

2.4-2.6. (Revised edition, Rev. Ms 3).

2.7. The wire is produced in coils consisting of one piece. The wire must be wound in untangled rows and unwind freely from the coils. When skeins are released from knitting, the wire should not be rolled into a figure-eight.

2.8. The mass of the wire in the coil must correspond to that indicated in Table. 4.

Table 4

Note. Allowed coils of wire weighing 50% less than indicated in table. 4 in the amount of not more than 10% of the total mass of wire coils in the batch.

2.7, 2.8. (Revised edition, Rev. Ms 2).

3. ACCEPTANCE RULES

3.1. The wire is accepted in batches. The batch should consist of wire of the same type and size and be issued with one quality document containing:

wire symbol;

net weight;

test results;

date of manufacture.

(Revised edition, Rev. Ms 2).

3.2. For external inspection and measurement of the wire, as well as to check the mass of the coils, 3% of the coils are selected from each batch, but not less than three coils.

3.3. Or wire, adopted in accordance with paragraph 3.2 of this standard, select 3% of the coils, but not less than three coils, to check its mechanical properties, the quality of the zinc coating and electrical resistance.

3.4. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double number of samples taken from skeins from among those that did not pass the test.

The retest results apply to the entire lot.

3.3, 3.4. (Revised edition, Rev. No. 2).

4. TEST METHODS

4.1a. To determine the mechanical properties of the wire, the adhesion of the zinc coating to the steel base, the surface density of zinc, the number of immersions, and the electrical resistance, one sample is taken from each controlled coil.

(Introduced additionally, Amendment No. 2).

4.1. External inspection of the wire is carried out visually.

4.2. The wire diameter is measured with a measuring tool with a scale division value of up to 0.01 mm in two mutually perpendicular directions of one section at least in three places of the coil. To measure the diameter, a section of wire with a smooth surface without zinc influx is selected.

4.3. The tensile test of the wire is carried out according to GOST 10446 on samples with a calculated length of at least 200 mm.

4.4. The bend test of the wire is carried out according to GOST 1579.

At the request of the consumer, the finished copper wire is checked for copper content in accordance with GOST 22536.8 and GOST 22536.0.

4.6. The test of the quality of the zinc coating of the wire by winding is carried out according to GOST 10447.

4.7. The surface density of zinc is determined by weight or volume-gasometric methods.

The weight method is used for precise definitions and in case of disagreement in assessing the quality of the wire.

The length of the wire sample for determining the surface density of zinc must comply with the standards specified in table. five.

Samples may be cut into an arbitrary number of segments depending on the test conditions.

(Revised edition, Rev. Ns 2).

4.7.1. Volumetric-gasometric method

The removal of the zinc coating is carried out in a device consisting of a reservoir and a glass burette with two taps connected to it by a rubber hose, with the samples completely immersed in the solution at a temperature environment until the gassing stops.

wire samples are taken and the length set for testing is measured in accordance with the requirements of Table. five;

degrease wire samples in alcohol, benzene or gasoline and wipe with a clean cloth;

dissolve the zinc coating, completely trapping the hydrogen released in the process;

measure the volume of released hydrogen and bring to normal conditions (pressure 760 mm Hg. Art., temperature 0°C) using tables of correction factors;

calculate the average surface density of zinc per 1 m 2 of the surface of the wire, (M) in grams according to the formula

where Ud is the volume of hydrogen under normal conditions, cm 3; d - nominal diameter of the wire sample, mm;

/ - sample length, mm.

Zinc is etched in an aqueous solution of a mixture of acids: sulfuric acid according to GOST 4204 - 100 g / dm 3, hydrochloric acid according to GOST 3118 - 34 g / dm 3

or in a solution of inhibited sulfuric acid, prepared as follows: 2 g of Sb 2 0 3 or As 2 0 3 are dissolved in 60 cm 3 of hydrochloric acid according to GOST 3118, with a density of 1.19 g / cm 3 and add to 1 dm 3 sulfuric acid according to GOST 4204, concentration 80 g / dm 3.

The bleed solution is replaced as it is depleted.

(Changed edition, Rev. No. 2, 3).

4.7.2. weight method

The surface density of zinc is determined by dissolving the coating from wire samples in a solution of inhibited sulfuric acid of the composition specified in paragraph 4.7.1.

The test is carried out in the following order:

samples of galvanized wire are degreased in alcohol, benzene or gasoline and wiped with a clean cloth;

weigh the samples;

dissolve the zinc coating;

wash the samples in distilled water;

wipe with a clean cloth until moisture is removed and weigh again;

measure the actual diameter of the sample after etching zinc;

calculate the average surface density of zinc per 1 m 2 of the surface of the wire (M x) in grams according to the formula

M. = 1962 - 1 d,

where m is the mass of the wire sample (group of samples) before removing the coating, g; m 1 - weight of the wire sample (group of samples) after removing the coating, g; d is the diameter of the wire sample after coating etching, mm.

The values ​​of m and m x are calculated with an accuracy of 0.001 g, the value of d- with an accuracy of 0.01 mm, the value of the average surface density of zinc - with an accuracy of 0.1 g/m 2 .

(Revised edition, Rev. No. 2).

4.8. The continuity and uniformity of the zinc coating is controlled by immersing a sample of galvanized wire in a solution of copper sulfate, prepared by dissolving one weight part of dry crystalline copper sulfate according to GOST 4165 in five weight parts of distilled water and neutralized with an excess of freshly precipitated copper oxide hydrate. After neutralization, the solution must be filtered. The density of the neutralized filtered solution should be 1.114-1.116 g/cm 3 .

The temperature of the copper sulfate solution during the test shall be (18 ± 2) °C.

The test procedure is as follows:

samples of wire 150 mm long are taken, washed with alcohol, gasoline or benzene.

If the samples are washed with gasoline or benzene, then they are additionally washed with distilled water and wiped to remove moisture;

immerse the samples in a solution of copper sulfate to a depth of at least 100 mm.

Samples must be immersed for exactly 1 min.

After each immersion in the solution, the samples are immediately rinsed with distilled

water and wipe with a clean cloth. The number of samples simultaneously immersed in the solution should not exceed six.

Wire samples should be in a solution of copper sulfate in a fixed position, not in contact with each other and with the walls of the vessel.

The permissible number of samples for testing in the same solution of copper sulfate with a volume of 200 cm 3 must correspond to that indicated in Table. 6.

Table 6

If, after a specified number of immersions in the solution, there are sections on the surface of the wire sample covered with copper that do not come off when the sample is wiped with cotton wool or a clean cloth, then the sample is considered to have failed the test. Samples are viewed with the naked eye.

On the surface of the samples are allowed:

heterogeneity in color and luster;

redness in the area located at a distance of 25 mm from the level of the solution and at a distance of 20 mm from the lower end of the sample immersed in the solution;

a brown tint and reddening of a dotted character, disappearing or not increasing in size and intensity of color when the sample is additionally immersed in a solution of copper sulfate for 1-2 s.

4.9. The electrical resistance to direct current is determined using a double Thomson bridge with an accuracy of 0.00001 ohm. At the same time, the temperature of the room in which the test is carried out is measured.

The recalculation of the resistance R t of a wire 1 m long at a temperature of t "C to the resistance of the same wire - ^ 20 at a temperature of 20 ° C is carried out according to the formula

Rl ° ~ 1 + 0.00455 (t - 20°С)’

The electrical resistivity p 20 is calculated by the formula

Pro = -^20 ‘

where F= -- cross-sectional area of ​​the wire.

5. PACKAGING, LABELING, TRANSPORT AND STORAGE

5.1. Each coil of wire must be tied up in at least three places with soft galvanized wire according to GOST 3282 or other wire according to regulatory documentation and wrapped with a layer of paper, then a layer of non-woven materials or fabric made of chemical fibers, or a polymer film.

In mechanized packaging, each coil of wire must be wrapped with a layer of cable crepe paper in accordance with GOST 10396 or KMV-170 grade paper, or other crepe paper of equivalent protective properties.

The following are used as packaging materials:

waxed paper in accordance with GOST 9569 (it is allowed to use two-layer packaging paper in accordance with GOST 8828 or other paper that provides protection against corrosion);

polymer film according to GOST 10354 or GOST 16272, or other polymer film;

container stitched or glued fabric, sewn tape from waste of the textile industry or fabric from chemical fibers according to regulatory documentation.

By agreement between the consumer and the manufacturer, the wire is not packaged.

Wire shipped to the Far North and hard-to-reach areas is packed in accordance with GOST 15846.

5.2. Coils of wire of the same diameter and of the same type can be bundled into coils.

5.3. The mass of a skein or coil should not exceed 80 kg.

With the consent of the consumer, an increased mass of a skein or coil is allowed.

The formation of packages in transport packages is carried out in accordance with GOST 21650, GOST 24597 and the rules for the carriage of goods approved by the relevant departments.

(Changed edition, Rev. No. 1, 2, 3).

5.4. Each coil of wire must be permanently affixed with a label stating:

trademark or the name and trademark of the manufacturer;

wire symbol.

(Revised edition, Rev. Ms 1, 2).

5.5. (Deleted, Rev. No. 2).

5.6. The wire is transported by transport of all types in accordance with the rules for the carriage of goods in force for this type of transport.

Placement and securing of cargo in railway vehicles must comply with the technical conditions for loading and securing cargo, approved by the Ministry of Railways of the USSR.

Transportation of wire railway produced in small or carload shipments.

It is allowed to transport wire in universal containers according to GOST 15102, GOST 20435, GOST 22225.

(Revised edition, Rev. No. 3).

5.7. The wire is stored in accordance with the requirements of GOST 15150, storage conditions 5.

(Revised edition, Rev. No. 2).

5.8. Transport marking - according to GOST 14192.

(Introduced additionally, Rev. Ns 2).

APPENDIX 1 Reference

The highest permissible electrical resistance of 1 m of copper wire (p not more than 0.146 Ohm - mm 2 / **)

APPENDIX 2 Reference

The highest permissible electrical resistance of 1 m of ordinary and copper wire (p not more than 0.138 Ohm ■ mm^/m)

APPENDIX 2. (Changed edition, Rev. No. 3).

APPENDIX 3 Reference

The highest allowable electrical resistance of 1 m of ordinary wire (not more than 0.130 Ohm mm 2 /*)

APPENDIX 3. (Introduced additionally, Amendment No. 3).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR DEVELOPERS

K.I. Tulenkov, I.V. Barysheva, V.P. Ivanov, Z.E. Filchenko

2. APPROVED AND INTRODUCED BY Decree State Committee standards of the Council of Ministers of the USSR dated 03.08.73 No. 1914

3. REPLACE GOST 1668-46

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

5. The limitation of the validity period was removed according to protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)

6. REPUBLICATION (April 1998) with Amendments No. 1, 2, 3, approved in February 1983, December 1984, March 1989 (IUS 5-83, 3-85, 6-89)

Editor L.I. Nakhimova Technical editor V.N. Prusakova Proofreader V.E. Nesterova Computer layout S.V. Ryabovoy

Ed. lip. No. 021007 dated 10.08.95. Handed over to the set 04/17/87. Signed for publication on May 25, 1998. Cond. 1.40. Uch.-iedl. 0.97.

Circulation 168 copies. From 624. Law. 419.

IPK Standards Publishing House, 107076, Moscow, Kolodezny per., 14.

Typed at the Publishing House on a PC

Branch of IPK Publishing house of standards - type. “Moscow printer”, Moscow, Lyalin per., 6

1.1. The wire is produced depending on the brand of wire rod:

copper - M,

ordinary;

manufacturing accuracy:

normal accuracy,

increased accuracy - P;

depending on the surface density of zinc of two classes:

1st class - 1,

2nd class - 2.

1.2. The diameter of the wire and the maximum deviations along it must correspond to those indicated in table. one.

Table 1

1.3. The ovality of the wire (the difference between the largest and smallest diameter of one section) should not exceed the limit deviations in diameter.

Legend Examples

Linear wire with a diameter of 4.00 mm, ordinary, high accuracy, 1st class:

Wire 4P-1 GOST 1668-73

Linear wire with a diameter of 4.00 mm, copper, normal accuracy, 2nd class:

Wire 4 M-2 GOST 1668-73

1.1 - 1.3

2. TECHNICAL REQUIREMENTS

2.1. The wire must be manufactured in accordance with the requirements of this standard according to the technological regulations approved in the prescribed manner, from wire rod according to the normative document.

2.2. The mechanical properties of the wire must comply with the standards specified in Table. 2.

Table 2

Notes :

1. The manufacturer guarantees that the mechanical properties of the wire with a diameter of 2.5 - 6.0 mm comply with the standards given in Table. 2 of this standard, after 20 days from the date of manufacture.

2. In the first two days from the moment of heat treatment, it is allowed for the manufacturer to accept wire with a diameter of 2.5 - 6.0 mm with a tensile strength of at least 330 MPa (34 kgf / mm 2).

2.3. The zinc coating on the wire must be continuous, without gaps and cracks visible without the use of magnifying devices.

Separate influxes of zinc cannot serve as a basis for rejection.

Minor scratches, dents, individual roughness of the zinc coating, as well as non-uniformity of the wire surface in color, white spots, sparkles and white deposits in the form of adhering zinc oxide are allowed if the coating withstands the number of immersions indicated in Table. 3.

Table 3

2.4. The adhesion of the zinc coating to the steel base must be strong. The zinc coating should not crack and peel off when the wire is spirally wound with eight tight turns on a cylindrical rod with a diameter indicated in Table. 3a. Surface dust-like peeling of the zinc coating on coiled samples of galvanized wire is not a rejection sign.

Table 3a

2.5. The surface density of zinc and the number of immersions for 60 seconds in a solution of copper sulfate must comply with the standards specified in table. 3.

2.6. The specific electrical resistance of the wire at a temperature of plus 20 ° C should not exceed:

cuprous - 0.146 Ohm × mm 2 /m;

ordinary - 0.138 Ohm × mm 2 / m.

By agreement between the manufacturer and the consumer, the electrical resistivity of the wire should not exceed:

cuprous - 0.138 Ohm × mm 2 /m;

ordinary - 0.130 Ohm × mm 2 / m.

The norms of the highest permissible values ​​​​of electrical resistance of 1 m of wire are given in the appendices, and.

2.4 - 2.6. (Revised edition, Rev. No. 3).

2.7. The wire is produced in coils consisting of one piece. The wire must be wound in untangled rows and unwind freely from the coils. When skeins are released from knitting, the wire should not be rolled into a figure-eight.

2.8. The mass of the wire in the coil must correspond to that indicated in Table. 4.

Table 4

Note . Allowed coils of wire weighing 50% less than indicated in table. 4 in the amount of not more than 10% of the total mass of wire coils in the batch.

2.7, 2.8. (Revised edition, Rev. No. 2).

3. ACCEPTANCE RULES

3.1. The wire is accepted in batches. The batch should consist of wire of the same type and size and be issued with one quality document containing:

wire symbol;

net weight;

test results;

date of manufacture.

(Revised edition, Rev. No. 2).

3.2. For external inspection and measurement of the wire, as well as to check the mass of the coils, 3% of the coils are selected from each batch, but not less than three coils.

3.3. From the wire adopted in accordance with clause 3.2 of this standard, 3% of the coils, but not less than three coils, are taken to check its mechanical properties, the quality of the zinc coating and electrical resistance.

3.4. If unsatisfactory test results are obtained for at least one of the indicators, repeated tests are carried out on it on a double number of samples taken from skeins from among those that did not pass the test.

The retest results apply to the entire lot.

3.3, 3.4. (Revised edition, Rev. No. 2).

4. TEST METHODS

4.1a. To determine the mechanical properties of the wire, the adhesion of the zinc coating to the steel base, the surface density of zinc, the number of immersions, and the electrical resistance, one sample is taken from each controlled coil.

4.1. External inspection of the wire is carried out visually.

4.2. The wire diameter is measured with a measuring tool with a scale division value of up to 0.01 mm in two mutually perpendicular directions of one section at least in three places of the coil. To measure the diameter, a section of wire with a smooth surface without zinc influx is selected.

4.3. The tensile test of the wire is carried out according to GOST 10446 on samples with a calculated length of at least 200 mm.

4.4. The wire test for bending is carried out according to GOST 1579.

4.5. The content of copper in the wire is certified by the document of the source metal supplier.

At the request of the consumer, the finished copper wire is checked for copper content in accordance with GOST 22536.8 and GOST 22536.0.

4.6. The test of the quality of the zinc coating of the wire by winding is carried out according to GOST 10447.

4.7. The surface density of zinc is determined by weight or volume-gasometric methods.

The weight method is used for particularly accurate determinations and in case of disagreement in assessing the quality of the wire.

The length of the wire sample for determining the surface density of zinc must comply with the standards specified in table. five.

Table 5

Samples may be cut into an arbitrary number of segments depending on the test conditions.

(Revised edition, Rev. No. 2).

4.7.1. Volumetric-gasometric method

The removal of the zinc coating is carried out in a device consisting of a tank and a glass burette with two taps connected to it by a rubber hose, with the samples completely immersed in the solution at ambient temperature until the gas evolution stops.

wire samples are taken and the length set for testing is measured in accordance with the requirements of Table. five;

degrease wire samples in alcohol, benzene or gasoline and wipe with a clean cloth;

dissolve the zinc coating, completely trapping the hydrogen released in the process;

measure the volume of hydrogen released and bring to normal conditions (pressure 760 mm Hg, temperature 0 °C) using tables of correction factors;

calculate the average surface density of zinc per 1 m 2 of the wire surface, ( M) in grams according to the formula

where V0- the volume of hydrogen under normal conditions, cm 3;

d- nominal diameter of the wire sample, mm;

l- sample length, mm.

Zinc is etched in an aqueous solution of a mixture of acids:

sulfuric according to GOST 4204 - 100 g / dm 3,

salt according to GOST 3118 - 34 g / dm 3

or in a solution of inhibited sulfuric acid, prepared as follows: 2 g of Sb 2 O 3 or As 2 O 3 is dissolved in 60 cm 3 of hydrochloric acid according to GOST 3118, with a density of 1.19 g / cm 3 and added to 1 dm 3 of sulfuric acid according to GOST 4204, concentration 80 g / dm 3.

The bleed solution is replaced as it is depleted.

(Changed edition, Rev. No. 2, 3).

4.7.2. weight method

The surface density of zinc is determined by dissolving the coating from wire samples in a solution of inhibited sulfuric acid of the composition specified in.

The test is carried out in the following order:

samples of galvanized wire are degreased in alcohol, benzene or gasoline and wiped with a clean cloth;

weigh the samples;

dissolve the zinc coating;

wash the samples in distilled water;

wipe with a clean cloth until moisture is removed and weigh again;

measure the actual diameter of the sample after etching zinc;

calculate the average surface density of zinc per 1 m 2 of the surface of the wire ( M 1) in grams according to the formula

where m- mass of the wire sample (group of samples) before coating removal, g;

m 1 - mass of the wire sample (group of samples) after coating removal, g;

d- diameter of the wire sample after coating etching, mm.

Quantities m And m 1 is calculated with an accuracy of 0.001 g, the value d- from with an accuracy of 0.01 mm, the value of the average surface density of zinc - with an accuracy of 0.1 g/m 2 .

(Revised edition, Rev. No. 2).

4.8. The continuity and uniformity of the zinc coating is controlled by immersing a sample of galvanized wire in a solution of copper sulfate, prepared by dissolving one weight part of dry crystalline copper sulfate according to GOST 4165 in five weight parts of distilled water and neutralized with an excess of freshly precipitated copper oxide hydrate. After neutralization, the solution must be filtered. The density of the neutralized filtered solution should be 1.114 - 1.116 g/cm 3 .

The temperature of the copper sulfate solution during the test shall be (18 ± 2) °C.

The test procedure is as follows:

samples of wire 150 mm long are taken, washed with alcohol, gasoline or benzene.

If the samples are washed with gasoline or benzene, then they are additionally washed with distilled water and wiped to remove moisture;

immerse the samples in a solution of copper sulfate to a depth of at least 100 mm.

Samples must be immersed for exactly 1 min.

After each immersion in the solution, the samples are immediately rinsed with distilled water and wiped with a clean cloth. The number of samples simultaneously immersed in the solution should not exceed six.

Wire samples should be in a solution of copper sulfate in a fixed position, not in contact with each other and with the walls of the vessel.

The permissible number of samples for testing in the same solution of copper sulfate with a volume of 200 cm 3 must correspond to that indicated in Table. 6.

Table 6

If, after a specified number of immersions in the solution, there are sections on the surface of the wire sample covered with copper that do not come off when the sample is wiped with cotton wool or a clean cloth, then the sample is considered to have failed the test. Samples are viewed with the naked eye.

On the surface of the samples are allowed:

heterogeneity in color and luster;

redness in the area located at a distance of 25 mm from the level of the solution and at a distance of 20 mm from the lower end of the sample immersed in the solution;

a brown tint and reddening of a dotted nature, disappearing or not increasing in size and intensity of color when the sample is additionally immersed in a solution of copper sulfate for 1–2 s.

4.9. The electrical resistance to direct current is determined using a double Thomson bridge with an accuracy of 0.00001 ohm. At the same time, the temperature of the room in which the test is carried out is measured.

Recalculation of resistance R t wire 1 m long at a temperature t°С on the resistance of the same wire R 20 at a temperature of 20 ° C is produced according to the formula

Electrical resistivity r 20 calculated according to the formula

where is the cross-sectional area of ​​the wire.

5. PACKAGING, LABELING, TRANSPORT AND STORAGE

5.1. Each coil of wire must be tied up in at least three places with soft galvanized wire according to GOST 3282 or other wire according to regulatory documentation and wrapped with a layer of paper, then a layer of non-woven materials or fabric made of chemical fibers, or a polymer film.

In mechanized packaging, each coil of wire must be wrapped with a layer of cable crepe paper in accordance with GOST 10396 or KMV-170 grade paper, or other crepe paper of equivalent protective properties.

The following are used as packaging materials:

waxed paper in accordance with GOST 9569 (it is allowed to use two-layer packaging paper in accordance with GOST 8828 or other paper that provides protection against corrosion);

polymer film according to GOST 10354 or GOST 16272, or other polymer film;

container stitched or glued fabric, sewn tape from waste of the textile industry or fabric from chemical fibers according to regulatory documentation.

By agreement between the consumer and the manufacturer, the wire is not packaged.

Wire shipped to the Far North and hard-to-reach areas is packed in accordance with GOST 15846.

5.2. Coils of wire of the same diameter and of the same type can be bundled into coils.

5.3. The mass of a skein or coil should not exceed 80 kg.

With the consent of the consumer, an increased mass of a skein or coil is allowed.

The formation of packages in transport packages is carried out in accordance with GOST 21650, GOST 24597 and the rules for the carriage of goods approved by the relevant departments.

(Changed edition, Rev. No. 1, 2, 3).

5.4. Each coil of wire must be permanently affixed with a label stating:

trademark or name and trademark of the manufacturer;

wire symbol.

(Changed edition, Rev. No. 1, 2).

5.5. (Deleted, Rev. No. 2).

5.6. The wire is transported by transport of all types in accordance with the rules for the carriage of goods in force for this type of transport.

The placement and securing of cargo in railway vehicles must comply with the technical conditions for loading and securing cargo, approved by the Ministry of Railways of the USSR.

Transportation of wire by rail is carried out in small or carload shipments.

It is allowed to transport wire in universal containers according to GOST 15102, GOST 20435, GOST 22225.

(Revised edition, Rev. No. 3).

5.7. The wire is stored in accordance with the requirements of GOST 15150, storage conditions 5.

(Revised edition, Rev. No. 2).

5.8. Transport marking - in accordance with GOST 14192.

(Introduced additionally, Amendment No. 2).

ATTACHMENT 1
Reference

The highest allowable electrical resistance of 1 m of copper wire ( r no more than 0.146 Ohm × mm 2 /m)

APPENDIX 2
Reference

The highest allowable electrical resistance of 1 m of ordinary and copper wire ( r no more than 0.138 Ohm × mm 2 /m)

APPENDIX 2(Revised edition, Rev. No. 3).

APPENDIX 3
Reference

The highest allowable electrical resistance of 1 m of ordinary wire (no more than 0.130 Ohm × mm 2 /m)