7 CFR 1755.890 - RUS specification for filled telephone cables with expanded insulation.

§ 1755.890 RUS specification for filled telephone cables with expanded insulation.
(a) Scope.
(1) This section covers the requirements for filled telephone cables intended for direct burial installation either by trenching or by direct plowing, for underground application by placement in a duct, or for aerial installation by attachment to a support strand.
(i) The conductors are solid copper, individually insulated with an extruded cellular insulating compound which may be either totally expanded or expanded with a solid skin coating.
(ii) The insulated conductors are twisted into pairs which are then stranded or oscillated to form a cylindrical core.
(iii) For high frequency applications, the cable core may be separated into compartments with screening shields.
(iv) A moisture resistant filling compound is applied to the stranded conductors completely covering the insulated conductors and filling the interstices between pairs and units.
(v) The cable structure is completed by the application of suitable core wrapping material, a flooding compound, a shield or a shield/armor, and an overall plastic jacket.
(2) The number of pairs and gauge size of conductors which are used within the RUS program are provided in the following table:
Note: Cables larger in pair sizes than those shown in this table must meet all requirements of this section.
AWG 19 22 24 26
Pairs 6 6 6
12 12 12
18 18 18
25 25 25 25
50 50 50
75 75 75
100 100 100
150 150 150
200 200 200
300 300 300
400 400 400
600 600 600
900 900 900
1000 1000 1000
1200 1200
1500 1500
1800 1800
2100
2400
2700
(3) Screened cable, when specified, must meet all requirements of this section. The pair sizes of screened cables used within the RUS program are referenced in paragraph (e)(2)(i) of this section.
(4) All cables sold to RUS borrowers for projects involving RUS loan funds under this section must be accepted by RUS Technical Standards Committee “A” (Telephone). For cables manufactured to the specification of this section, all design changes to an accepted design must be submitted for acceptance. RUS will be the sole authority on what constitutes a design change.
(5) Materials, manufacturing techniques, or cable designs not specifically addressed by this section may be allowed if accepted by RUS. Justification for acceptance of modified materials, manufacturing techniques, or cable designs must be provided to substantiate product utility and long-term stability and endurance.
(6) The American National Standard Institute/Insulated Cable Engineers Association, Inc. (ANSI/ICEA) S-84-608-1988, Standard For Telecommunications Cable, Filled, Polyolefin Insulated, Copper Conductor Technical Requirements referenced throughout this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ANSI/ICEA S-84-608-1988 are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Copies are available from ICEA, P. O. Box 440, South Yarmouth, MA 02664, telephone number (508) 394-4424.
(7) American Society for Testing and Materials specifications (ASTM) A 505-87, Standard Specification for Steel, Sheet and Strip, Alloy, Hot-Rolled and Cold-Rolled, General Requirements For; ASTM B 193-87, Standard Test Method for Resistivity of Electrical Conductor Materials; ASTM B 224-80, Standard Classification of Coppers; ASTM B 694-86, Standard Specification for Copper, Copper Alloy, and Copper-Clad Stainless Steel Sheet and Strip for Electrical Cable Shielding; ASTM D 4565-90a, Standard Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; and ASTM D 4566-90, Standard Test Methods for Electrical Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the ASTM standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Copies area available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187, telephone number (215) 299-5585.
(b) Conductors and conductor insulation.
(1) The gauge sizes of the copper conductors covered by this section must be 19, 22, 24, and 26 American Wire Gauge (AWG).
(2) Each conductor must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 2.1.
(3) Factory joints made in conductors during the manufacturing process must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 2.2.
(4) The raw materials used for conductor insulation must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 3.1 through 3.1.3.
(5) The finished conductor insulation must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 3.2.2, 3.2.3, and 3.3.
(6) Insulated conductor must not have an overall diameter greater than 2 millimeters (mm) (0.081 inch (in.)).
(7) A permissible overall performance level of faults in conductor insulation must average not greater than one fault per 12,000 conductor meters (40,000 conductor feet) for each gauge of conductor.
(i) All insulated conductors must be continuously tested for insulation faults during the twinning operation with a method of testing acceptable to RUS. The length count and number of faults must be recorded. The information must be retained for a period of 6 months and be available for review by RUS when requested.
(ii) The voltages for determining compliance with the requirements of this section are as follows:
AWG Direct Current Voltages (kilovolts)
19 4.5
22 3.6
24 3.0
26 2.4
(8) Repairs to the conductor insulation during manufacture are permissible. The method of repair must be accepted by RUS prior to its use. The repaired insulation must be capable of meeting the relevant electrical requirements of this section.
(9) All repaired sections of insulation must be retested in the same manner as originally tested for compliance with paragraph (b)(7) of this section.
(10) The colored insulating material removed from or tested on the conductor, from a finished cable, must meet the performance requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 3.4.1 through 3.4.6.
(c) Identification of pairs and twisting of pairs.
(1) The insulation must be colored to identify:
(i) The tip and ring conductor of each pair; and
(ii) Each pair in the completed cable.
(2) The colors to be used in the pairs in the 25 pair group, together with the pair numbers must be in accordance with the table specified in ANSI/ICEA S-84-608-1988, paragraph 3.5.
(3) Positive identification of the tip and ring conductors of each pair by marking each conductor of a pair with the color of its mate is permissible. The method of marking must be accepted by RUS prior to its use.
(4) Other methods of providing positive identification of the tip and ring conductors of each pair may be employed if accepted by RUS prior to its use.
(5) The insulated conductors must be twisted into pairs.
(6) In order to provide sufficiently high crosstalk isolation, the pair twists must be designed to enable the cable to meet the capacitance unbalance and crosstalk loss requirements of paragraphs (k)(5), (k)(6), and (k)(8) this section.
(7) The average length of pair twists in any pair in the finished cable, when measured on any 3 meter (10 foot) length, must not exceed the requirement specified in ANSI/ICEA S-84-608-1988, paragraph 3.5.
(d) Forming of the cable core.
(1) Twisted pairs must be assembled in such a way as to form a substantially cylindrical group.
(2) When desired for lay-up reasons, the basic group may be divided into two or more subgroups called units.
(3) Each group, or unit in a particular group, must be enclosed in bindings of the colors indicated for its particular pair count. The pair count, indicated by the colors of insulation, must be consecutive as indicated in paragraph (d)(6) of this section through units in a group.
(4) The filling compound must be applied to the cable core in such a way as to provide as near a completely filled core as is commercially practical.
(5) Threads and tapes used as binders must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 4.2 and 4.2.1.
(6) The colors of the bindings and their significance with respect to pair count must be as follows:
Group No. Color of Bindings Group Pair Count
1 White-Blue 1-25
2 White-Orange 26-50
3 White-Green 51-75
4 White-Brown 76-100
5 White-Slate 101-125
6 Red-Blue 126-150
7 Red-Orange 151-175
8 Red-Green 176-200
9 Red-Brown 201-225
10 Red-Slate 226-250
11 Black-Blue 251-275
12 Black-Orange 276-300
13 Black-Green 301-325
14 Black-Brown 326-350
15 Black-Slate 351-375
16 Yellow-Blue 376-400
17 Yellow-Orange 401-425
18 Yellow-Green 426-450
19 Yellow-Brown 451-475
20 Yellow-Slate 476-500
21 Violet-Blue 501-525
22 Violet-Orange 526-550
23 Violet-Green 551-575
24 Violet-Brown 576-600
(7) The use of the white unit binder in cables of 100 pairs or less is optional.
(8) When desired for manufacturing reasons, two or more 25 pair groups may be bound together with nonhygroscopic and nonwicking threads or tapes into a super-unit. Threads or tapes must meet the requirements specified in paragraph (d)(5) of this section. The group binders and the super-unit binders must be color coded such that the combination of the two binders must positively identify each 25 pair group from every other 25 pair group in the cable. Super-unit binders must be of the color shown in the following table:
Super-Unit Binder Colors
Pair Numbers Binder Color
1-600 White
601-1200 Red
1201-1800 Black
1801-2400 Yellow
2401-3000 Violet
3001-3600 Blue
3601-4200 Orange
4201-4800 Green
4801-5400 Brown
5401-6000 Slate
(9) Color binders must not be missing for more than 90 meters (300 feet) from any 25 pair group or from any subgroup used as part of a super-unit. At any cable cross-section, no adjacent 25 pair groups and no more than one subgroup of any super-unit may have missing binders. In no case must the total number of missing binders exceed three. Missing super-unit binders must not be permitted for any distance.
(10) Any reel of cable which contains missing binders must be labeled indicating the colors and location of the binders involved. The labeling must be applied to the reel and also to the cable.
(e) Screened cable.
(1) Screened cable must be constructed such that a metallic, internal screen(s) must be provided to separate and provide sufficient isolation between the compartments to meet the requirements of this section.
(2) At the option of the user or manufacturer, identified service pairs providing for voice order and fault location may be placed in screened cables.
(i) The number of service pairs provided must be one per twenty-five operating pairs plus two for a cable size up to and including 400 pairs, subject to a minimum of four service pairs. The pair counts for screened cables are as follows:
Screened Cable Pair Counts
Carrier Pair Count Service Pairs Total Pair Count
24 4 28
50 4 54
100 6 106
150 8 158
200 10 210
300 14 314
400 18 418
(ii) The service pairs must be equally divided among the compartments. The color sequence must be repeated in each compartment.
(iii) The electrical and physical characteristics of each service pair must meet all the requirements set forth in this section.
(iv) The colors used for the service pairs must be in accordance with the requirements of paragraph (b)(5) of this section. The color code used for the service pairs together with the service pair number are shown in the following table:
Color Code For Service Pairs
Service Pair No. Color
Tip Ring
1 White Red
2 Black
3 Yellow
4 Violet
5 Red Black
6 Yellow
7 Violet
8 Black Yellow
9 Violet
(3) The screen tape must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 5.1 through 5.4.
(4) The screen tape must be tested for dielectric strength by completely removing the protective coating from one end to be used for grounding purposes.
(i) Using an electrode, over a 30 centimeter (1 foot) length, apply a direct current (dc) voltage at the rate of rise of 500 volts/second until failure.
(ii) No breakdown should occur below 8 kilovolts.
(f) Filling compound.
(1) After or during the stranding operation and prior to application of the core wrap, filling compound must be applied to the cable core. The compound must be as nearly colorless as is commercially feasible and consistent with the end product requirements and pair identification.
(2) The filling compound must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 4.4 through 4.4.4.
(3) The individual cable manufacturer must satisfy RUS that the filling compound selected for use is suitable for its intended application. The filling compound must be applied to the cable in such a manner that the cable components will not be degraded.
(g) Core wrap.
(1) The core wrap must comply with the requirements specified in ANSI/ICEA-S-84-608-1988, paragraph 4.3.
(2) If required for manufacturing reasons, white or colored binders of nonhygroscopic and nonwicking material may be applied over the core and/or wrap. When used, binders must meet the requirements specified in paragraph (d)(5) of this section.
(3) Sufficient filling compound must have been applied to the core wrap so that voids or air spaces existing between the core and the inner side of the core wrap are minimized.
(h) Flooding compound.
(1) Sufficient flooding compound must be applied on all sheath interfaces so that voids and air spaces in these areas are minimized. When the optional armored design is used, the flooding compound must be applied between the core wrap and shield, between the shield and armor, and between the armor and the jacket so that voids and air spaces in these areas are minimized. The use of floodant over the outer metallic substrate is not required if uniform bonding, per paragraph (i)(7) of this section, is achieved between the plastic-clad metal and the jacket.
(2) The flooding compound must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 4.5 and the jacket slip test requirements of appendix A, paragraph (III)(5) of this section.
(3) The individual cable manufacturer must satisfy RUS that the flooding compound selected for use is acceptable for the application.
(i) Shield and optional armor.
(1) A single corrugated shield must be applied longitudinally over the core wrap.
(2) For unarmored cable the shield overlap must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.3.2. Core diameter is defined as the diameter under the core wrap and binding.
(3) For cables containing the coated aluminum shield/coated steel armor (CACSP) sheath design, the coated aluminum shield must be applied in accordance with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.3.2, Dual Tape Shielding System.
(4) General requirements for application of the shielding material are as follows:
(i) Successive lengths of shielding tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux or other acceptable means.
(ii) Shield splices must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.3.3.
(iii) The corrugations and the application process of the coated aluminum and copper bearing shields must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.3.1.
(iv) The shielding material must be applied in such a manner as to enable the cable to pass the cold bend test specified in paragraph (l)(3) of this section.
(5) The following is a list of acceptable materials for use as cable shielding. Other types of shielding materials may also be used provided they are accepted by RUS prior to their use.
Standard Cable Gopher Resistant Cable
1 Dimensions of uncoated metal.
8-mil Coated Aluminum 1 10-mil Copper
5-mil Copper 6-mil Copper-CladStainless Steel 5 mil Copper-Clad Stainless Steel 5 mil Copper-Clad Alloy Steel 7-mil Alloy 194 6-mil Alloy 194 8-mil Coated Aluminum 1 and 6-mil Coated Steel 1
(i) The 8-mil aluminum tape must be plastic coated on both sides and must comply with the requirements of ANSI/ICEA S-84-608-1988, paragraph 6.2.2.
(ii) The 5-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.2.3.
(iii) The 10-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.2.4.
(iv) The 6-mil copper clad stainless steel tape must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.2.5.
(v) The 5-mil copper clad stainless steel tape must be in the fully annealed condition and must conform to the requirements of American Society for Testing and Materials (ASTM) B 694-86, with a cladding ratio of 16/68/16.
(A) The electrical conductivity of the clad tape must be a minimum of 28 percent of the International Annealed Copper Standard (IACS) when measured per ASTM B 193-87.
(B) The tape must be nominally 0.13 millimeter (0.005 inch) thick with a minimum thickness of 0.11 millimeter (0.0045 inch).
(vi) The 5-mil copper clad alloy steel tape must be in the fully annealed condition and the copper component must conform to the requirements of ASTM B 224-80 and the alloy steel component must conform to the requirements of ASTM A 505-87, with a cladding ratio of 16/68/16.
(A) The electrical conductivity of the copper clad alloy steel tape must comply with the requirement specified in (5)(v)(A) of this section.
(B) The thickness of the copper clad alloy steel tape must comply with the requirements specified in (5)(v)(B) of this section.
(vii) The 6-mil and 7-mil 194 copper alloy tapes must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.2.6.
(6) The corrugation extensibility of the coated aluminum shield must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.4.
(7) When the jacket is bonded to the plastic coated aluminum shield, the bond between the jacket and shield must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 7.2.6.
(8) A single plastic coated steel corrugated armor must be applied longitudinally directly over the coated aluminum shield listed in paragraph (i)(5) of this section with an overlap complying with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.3.2, Outer Steel Tape.
(9) Successive lengths of steel armoring tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux or other acceptable means. Armor splices must comply with the breaking strength and resistance requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.3.3.
(10) The corrugations and the application process of the coated steel armor must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.3.1.
(i) The corrugations of the armor tape must coincide with the corrugations of the coated aluminum shield.
(ii) Overlapped portions of the armor tape must be in register (corrugations must coincide at overlap) and in contact at the outer edge.
(11) The armoring material must be so applied to enable the cable to pass the cold bend test specified in paragraph (l)(3) of this section.
(12) The 6-mil steel tape must be electrolytic chrome coated steel (ECCS) plastic coated on both sides and must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 6.2.8.
(13) When the jacket is bonded to the plastic coated steel armor, the bond between the jacket and armor must comply with the requirement specified in ANSI/ICEA-S-84-608-1988, paragraph 7.2.6.
(j) Cable jacket.
(1) The jacket must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 7.2.
(2) The raw materials used for the cable jacket must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 7.2.1.
(3) Jacketing material removed from or tested on the cable must meet the performance requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 7.2.3 and 7.2.4.
(4) The thickness of the jacket must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 7.2.2.
(k) Electrical requirements—
(1) Conductor resistance. The direct current resistance of any conductor in a completed cable and the average resistance of all conductors in a Quality Control Lot must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.1.
(2) Resistance unbalance.
(i) The direct current resistance unbalance between the two conductors of any pair in a completed cable and the average resistance unbalance of all pairs in a completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.2.
(ii) The resistance unbalance between tip and ring conductors shall be random with respect to the direction of unbalance. That is, the resistance of the tip conductors shall not be consistently higher with respect to the ring conductors and vice versa.
(3) Mutual capacitance. The average mutual capacitance of all pairs in a completed cable and the individual mutual capacitance of any pair in a completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.3.
(4) Capacitance difference.
(i) The capacitance difference for completed cables having 75 pairs or greater must comply with the requirement specified in ANSI/ICEA S-84-608-1988, paragraph 8.4.
(ii) When measuring screened cable, the inner and outer pairs must be selected from both sides of the screen.
(5) Pair-to-pair capacitance unbalance—
(i) Pair-to-pair. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.5.
(ii) Screened cable. In cables with 25 pairs or less and within each group of multigroup cables, the pair-to-pair capacitance unbalance between any two pairs in an individual compartment must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.5. The pair-to-pair capacitance unbalances to be considered must be:
(A) Between pairs adjacent in a layer in an individual compartment;
(B) Between pairs in centers of 4 pairs or less in an individual compartment; and
(C) Between pairs in adjacent layers in an individual compartment when the number of pairs in the inner (smaller) layer is 6 or less. The center is counted as a layer.
(iii) In cables with 25 pairs or less, the root-mean-square (rms) value is to include all the pair-to-pair unbalances measured for each compartment separately.
(iv) In cables containing more than 25 pairs, the rms value must include the pair-to-pair unbalances in the separate compartments.
(6) Pair-to-ground capacitance unbalance—
(i) Pair-to-ground. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.6.
(ii) When measuring pair-to-ground capacitance unbalance all pairs except the pair under test are grounded to the shield and/or shield/armor except when measuring cables containing super units in which case all other pairs in the same super unit must be grounded to the shield.
(iii) The screen tape must be left floating during the test.
(iv) Pair-to-ground capacitance unbalance may vary directly with the length of the cable.
(7) Attenuation.
(i) For nonscreened and screened cables, the average attenuation of all pairs on any reel when measured at 150 and 772 kilohertz must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.7, Foam and/or Foam-Skin Column.
(ii) For T1C type cables over 12 pairs, the maximum average attenuation of all pairs on any reel must not exceed the values listed below when measured at a frequency of 1576 kilohertz at or corrected to a temperature of 20 ±1 °C. The test must be conducted in accordance with ASTM D 4566-90.
AWG Maximum Average Attenuation decibel/kilometer (dB/km) (decibel/mile)
19 14.9 (24.0)
22 21.6 (34.8)
24 27.2 (43.8)
(8) Crosstalk loss.
(i) The equal level far-end power sum crosstalk loss (FEXT) as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.8, FEXT Table.
(ii) The near-end power sum crosstalk loss (NEXT) as measured on completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.8, NEXT Table.
(iii) Screened cable.
(A) For screened cables the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 8.9 and 8.9.1.
(B) For T1C screened cable the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraphs 8.9 and 8.9.2.
(9) Insulation resistance. The insulation resistance of each insulated conductor in a completed cable must comply with the requirement specified in ANSI/ICEA S-84-608-1988, paragraph 8.11.
(10) High voltage test.
(i) In each length of completed cable, the insulation between conductors must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.12, Foam and/or Foam-Skin Column.
(ii) In each length of completed cable, the dielectric between the shield and/or armor and conductors in the core must comply with the requirements specified in ANSI/ICEA S-84-608-1988, paragraph 8.13, Single Jacketed, Foam and/or Foam-Skin Column. In screened cable the screen tape must be left floating.
(iii) Screened cable.
(A) In each length of completed screened cable, the dielectric between the screen tape and the conductors in the core must comply with the requirement specified in ANSI/ICEA S-84-608-1988, paragraph 8.14.
(B) In this test, the cable shield and/or armor must be left floating.
(11) Electrical variations.
(i) Pairs in each length of cable having either a ground, cross, short, or open circuit condition will not be permitted.
(ii) The maximum number of pairs in a cable which may vary as specified in paragraph (k)(11)(iii) of this section from the electrical parameters given in this section are listed below. These pairs may be excluded from the arithmetic calculation.
Nominal Pair Count Maximum Number of Pairs With Allowable Electrical Variation
6-100 1
101-300 2
301-400 3
401-600 4
601 and above 6
(iii) Parameter variations.
(A) Capacitance unbalance-to-ground. If the cable fails either the maximum individual pair or average capacitance unbalance-to-ground requirement and all individual pairs are 3937 picofarad/kilometer (1200 picofarad/1000 feet) or less, the number of pairs specified in paragraph (k)(11)(ii) of this section may be eliminated from the average and maximum individual calculations.
(B) Resistance unbalance. Individual pair of 7 percent for all gauges.
(C) Conductor resistance, maximum. The following table shows maximum conductor resistance:
AWG ohms/kilometer (ohms/1000 feet)
Note: RUS recognizes that in large pair count cable (600 pair and above) a cross, short, or open circuit condition occasionally may develop in a pair which does not affect the performance of the other cable pairs. In these circumstances rejection of the entire cable may be economically unsound or repairs may be impractical. In such circumstances the manufacturer may desire to negotiate with the customer for acceptance of the cable. No more than 0.5 percent of the pairs may be involved.
19 29.9 (9.1)
22 60.0 (18.3)
24 94.5 (28.8)
26 151.6 (46.2)
(l) Mechanical requirements—
(1) Compound flow test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the compound flow test specified in ANSI/ICEA S-84-608-1988, paragraph 9.1 using a test temperature of 80 ±1 °C.
(2) Water penetration test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the water penetration test specified in ANSI/ICEA S-84-608-1988, paragraph 9.2.
(3) Cable cold bend test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable cold bend test specified in ANSI/ICEA S-84-608-1988, paragraph 9.3.
(4) Cable impact test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable impact test specified in ANSI/ICEA S-84-608-1988, paragraph 9.4.
(5) Jacket notch test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the jacket notch test specified in ANSI/ICEA S-84-608-1988, paragraph 9.5.
(6) Cable torsion test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the cable torsion test specified in ANSI/ICEA S-84-608-1988, paragraph 9.6.
(m) Sheath slitting cord (optional).
(1) Sheath slitting cord may be used in the cable structure at the option of the manufacturer unless specified by the end user.
(2) When a sheath slitting cord is used it must be nonhygroscopic and nonwicking, continuous throughout a length of cable and of sufficient strength to open the sheath without breaking the cord.
(n) Identification marker and length marker.
(1) Each length of cable must be identified in accordance with ANSI/ICEA S-84-608-1988, paragraphs 10.1 through 10.1.4. The color of the ink used for the initial outer jacket marking must be either white or silver.
(2) The markings must be printed on the jacket at regular intervals of not more than 0.6 meter (2 feet).
(3) The completed cable must have sequentially numbered length markers in accordance with ANSI/ICEA S-84-608-1988, paragraph 10.1.5. The color of the ink used for the initial outer jacket marking must be either white or silver.
(o) Preconnectorized cable (optional).
(1) At the option of the manufacturer and upon request by the purchaser, cables 100 pairs and larger may be factory terminated in 25 pair splicing modules.
(2) The splicing modules must meet the requirements of RUS Bulletin 345-54, PE-52, RUS Specification for Telephone Cable Splicing Connectors (Incorporated by Reference at § 1755.97), and be accepted by RUS prior to their use.
(p) Acceptance testing and extent of testing.
(1) The tests described in appendix A of this section are intended for acceptance of cable designs and major modifications of accepted designs. What constitutes a major modification is at the discretion of RUS. These tests are intended to show the inherent capability of the manufacturer to produce cable products having long life and stability.
(2) For initial acceptance, the manufacturer must submit:
(i) An original signature certification that the product fully complies with each section of the specification;
(ii) Qualification Test Data, per appendix A of this section;
(iii) To periodic plant inspections;
(iv) A certification that the product does or does not comply with the domestic origin manufacturing provisions of the “Buy American” requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.);
(v) Written user testimonials concerning field performance of the product; and
(vi) Other nonproprietary data deemed necessary by the Chief, Outside Plant Branch (Telephone).
(3) For requalification acceptance, the manufacturer must submit an original signature certification that the product fully complies with each section of the specification, excluding the Qualification Section, and a certification that the product does or does not comply with the domestic origin manufacturing provisions of the “Buy American” requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.), for acceptance by August 30 of each year. The required data must have been gathered within 90 days of the submission. If the initial acceptance of a product to this specification was within 180 days of August 30, then requalification for that product will not be required for that year.
(4) Initial and requalification acceptance requests should be addressed to:
Chairman, Technical Standards Committee “A” (Telephone), Telecommunications Standard Division, Rural Utilities Service, Washington, DC 20250-1500.
(5) Tests on 100 percent of completed cable.
(i) The shield and/or armor of each length of cable must be tested for continuity in accordance with ANSI/ICEA S-84-608-1988, paragraph 8.16.
(ii) The screen tape of each length of screened cable must be tested for continuity in accordance with ANSI/ICEA S-84-608-1988, paragraph 8.16.
(iii) Dielectric strength between conductors and shield and/or armor must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(ii) of this section.
(iv) Dielectric strength between conductors and screen tape must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(iii) of this section.
(v) Each conductor in the completed cable must be tested for continuity in accordance with ANSI/ICEA S-84-608-1988, paragraph 8.16.
(vi) Dielectric strength between conductors, in each length of completed cable, must be tested to insure freedom from shorts and crosses in each length of completed cable in accordance with paragraph (k)(10)(i) of this section.
(vii) Each conductor in the completed preconnectorized cable must be tested for continuity.
(viii) Each length of completed preconnectorized cable must be tested for split pairs.
(ix) The average mutual capacitance must be measured on all cables. If the average mutual capacitance for the first 100 pairs tested from randomly selected groups is between 50 and 53 nanofarads/kilometer (nF/km) (80 and 85 nanofarad/mile), the remainder of the pairs need not be tested on the 100 percent basis (See paragraph (k)(3) of this section).
(6) Capability tests. Tests on a quality assurance basis must be made as frequently as is required for each manufacturer to determine and maintain compliance with:
(i) Performance requirements for conductor insulation, jacketing material, and filling and flooding compounds;
(ii) Bonding properties of coated or laminated shielding and armoring materials and performance requirements for screen tape;
(iii) Sequential marking and lettering;
(iv) Capacitance difference, capacitance unbalance, crosstalk, and attenuation;
(v) Insulation resistance, conductor resistance, and resistance unbalance;
(vi) Cable cold bend and cable impact tests;
(vii) Water penetration and compound flow tests; and
(viii) Jacket notch and cable torsion tests.
(q) Summary of records of electrical and physical tests.
(1) Each manufacturer must maintain suitable summary records for a period of at least 3 years of all electrical and physical tests required on completed cable by this section as set forth in paragraphs (p)(5) and (p)(6) of this section. The test data for a particular reel must be in a form that it may be readily available to the purchaser or to RUS upon request.
(2) Measurements and computed values must be rounded off to the number of places or figures specified for the requirement according to ANSI/ICEA S-84-608-1988, paragraph 1.3.
(r) Manufacturing irregularities.
(1) Repairs to the shield and/or armor are not permitted in cable supplied to end users under this section.
(2) Minor defects in jackets (defects having a dimension of 3 millimeters (0.125 inch.) or less in any direction) may be repaired by means of heat fusing in accordance with good commercial practices utilizing sheath grade compounds.
(s) Preparation for shipment.
(1) The cable must be shipped on reels. The diameter of the drum must be large enough to prevent damage to the cable from reeling or unreeling. The reels must be substantial and so constructed as to prevent damage to the cable during shipment and handling.
(2) The thermal wrap must comply with the requirements of ANSI/ICEA S-84-608-1988, paragraph 10.3. When a thermal reel wrap is supplied, the wrap must be applied to the reel and must be suitably secured in place to minimize thermal exposure to the cable during storage and shipment. The use of the thermal reel wrap as a means of reel protection will be at the option of the manufacturer unless specified by the end user.
(3) The outer end of the cable must be securely fastened to the reel head so as to prevent the cable from becoming loose in transit. The inner end of the cable must be securely fastened in such a way as to make it readily available if required for electrical testing. Spikes, staples, or other fastening devices which penetrate the cable jacket must not be used. The method of fastening the cable ends must be acceptable to RUS and accepted prior to its use.
(4) Each length of cable must be wound on a separate reel unless otherwise specified or agreed to by the purchaser.
(5) The arbor hole must admit a spindle 63 millimeters (2.5 inches) in diameter without binding. Steel arbor hole liners may be used but must be accepted by RUS prior to their use.
(6) Each reel must be plainly marked to indicate the direction in which it should be rolled to prevent loosening of the cable on the reel.
(7) Each reel must be stenciled or labeled on either one or both sides with the information specified in ANSI/ICEA S-84-608-1988, paragraph 10.4 and the RUS cable designation:
Cable Designation
BFCE
Cable Construction
Pair Count
Conductor Gauge
E = Expanded Insulation
A = Coated Aluminum Shield
C = Copper Shield
Y = Gopher Resistant Shield
X = Armored, Separate Shield
H = T1 Screened Cable
H1C = T1C Screened Cable
P = Preconnectorized
Example: BFCEXH100-22
Buried Filled Cable, Expanded Insulation, Armored (w/separate shield), T1 Screened Cable, 100 pair, 22 AWG.
(8) When cable manufactured to the requirements of this specification is shipped, both ends must be equipped with end caps acceptable to RUS.
(9) When preconnectorized cables are shipped, the splicing modules must be protected to prevent damage during shipment and handling. The protection method must be acceptable to RUS and accepted prior to its use.
(10) All cables ordered for use in underground duct applications must be equipped with a factory-installed pulling-eye on the outer end in accordance with ANSI/ICEA S-84-608-1988, paragraph 10.5.2.
(The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572-0059)
Environmental Conditioning_______
Frequency 1 kilohertz
Pair Number Capacitance
nF/km (nanofarad/mile)
Initial Final
Overall Percent Difference in Average x _______
1 ______ ______
3 ______ ______
5 ______ ______
7 ______ ______
9 ______ ______
11 ______ ______
13 ______ ______
15 ______ ______
17 ______ ______
19 ______ ______
21 ______ ______
23 ______ ______
25 ______ ______
Average x ______ ______
Environmental Conditioning_______
Frequency 150 kilohertz
Pair Number Capacitance Attenuation
nF/km (nanofarad/mile) dB/km (decibel/mile)
Initial Final Initial Final
Overall Percent Difference in Average xCapacitance:______Conductance:______
1 ___ ___ ___ ___
3 ___ ___ ___ ___
5 ___ ___ ___ ___
7 ___ ___ ___ ___
9 ___ ___ ___ ___
11 ___ ___ ___ ___
13 ___ ___ ___ ___
15 ___ ___ ___ ___
17 ___ ___ ___ ___
19 ___ ___ ___ ___
21 ___ ___ ___ ___
23 ___ ___ ___ ___
25 ___ ___ ___ ___
Average x ___ ___ ___ ___
Environmental Conditioning_______
Frequency 772 kilohertz
Pair Number Capacitance Attenuation
nF/km (nanofarad/mile) dB/km (decibel/mile)
Initial Final Initial Final
Overall Percent Difference in Average xCapacitance:______Conductance:______
1 ___ ___ ___ ___
3 ___ ___ ___ ___
5 ___ ___ ___ ___
7 ___ ___ ___ ___
9 ___ ___ ___ ___
11 ___ ___ ___ ___
13 ___ ___ ___ ___
15 ___ ___ ___ ___
17 ___ ___ ___ ___
19 ___ ___ ___ ___
21 ___ ___ ___ ___
23 ___ ___ ___ ___
25 ___ ___ ___ ___
Average x ___ ___ ___ ___
Environmental Conditioning_______
Water Immersion Test (1 kilohertz)
Pair Number Capacitance
nF/km (nanofarad/mile)
Initial 24 Hours Final
Overall Percent Difference in Average x _______
1 ___ ___ ___
3 ___ ___ ___
5 ___ ___ ___
7 ___ ___ ___
9 ___ ___ ___
11 ___ ___ ___
13 ___ ___ ___
15 ___ ___ ___
17 ___ ___ ___
19 ___ ___ ___
21 ___ ___ ___
23 ___ ___ ___
25 ___ ___ ___
Average x ___ ___ ___
Water Penetration Test
Option A Option B
End Leakage grams Weight Gain grams End Leakage grams Penetration mm (in.)
Control
Heat Age
Humidity Exposure
Temperature Cycling
Insulation Compression
Failures
Control ________
Heat Age ________
Humidity Exposure ________
Temperature Cycling ________
Jacket Slip Strength @ 50 °C
Load in newtons (pound-force)
Control ________
Heat Age ________
Humidity Exposure ________
Temperature Cycling ________
Filler Exudation (grams)
Heat Age ________
Humidity Exposure ________
Temperature Cycling ________
Surge Test (kilovolts)
Conductor to Conductor ________
Shield to Conductors ________
[58 FR 29328, May 20, 1993, as amended at 60 FR 1711, Jan. 5, 1995; 69 FR 18803, Apr. 9, 2004]

Title 7 published on 2014-01-01

no entries appear in the Federal Register after this date.

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code
U.S. Code: Title 7 - AGRICULTURE

§ 901 - Short title

§ 902 - General authority of Secretary of Agriculture

§ 903 - Authorization of appropriations

§ 904 - Loans for electrical plants and transmission lines

§ 905 - Fees for certain loan guarantees

§ 906 - Funding for administrative expenses

§ 906a - Use of funds outside the United States or its territories prohibited

§ 907 - Acquisition of property pledged for loans; disposition; sale of pledged property by borrower

§ 908 - Repealed.

§ 909 - Administration on nonpolitical basis; dismissal of officers or employees for violating provision

§ 910 - Repealed.

§ 911 - Acceptance of services of Federal or State officers; application of civil service laws; expenditures for supplies and equipment

§ 911a - Repealed.

§ 912 - Extension of time for repayment of loans

§ 912a - Rescheduling and refinancing of loans

§ 913 - Definitions

§ 914 - Separability

§ 915 - Purchase of financial and credit reports

§ 916 - Criteria for loans

§ 917 - Prohibition on restricting water and waste facility services to electric customers

§ 918 - General prohibitions

§ 918a - Energy generation, transmission, and distribution facilities efficiency grants and loans in rural communities with extremely high energy costs

§ 918b - Acquisition of existing systems in rural communities with high energy costs

§ 918c - Rural and remote communities electrification grants

§ 1921 - Congressional findings

§ 6941 - Under Secretary of Agriculture for Rural Development

§ 6941a - Coordinator for Chronically Underserved Rural Areas

§ 6942 - Rural Utilities Service

§ 6943 - Rural Housing and Community Development Service

§ 6944 - Rural Business and Cooperative Development Service

§ 6945 - Rural Development Disaster Assistance Fund

Title 7 published on 2014-01-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 7 CFR 1755 after this date.

  • 2014-02-12; vol. 79 # 29 - Wednesday, February 12, 2014
    1. 79 FR 8327 - New Equipment Contract for Telecommunications and Broadband Borrowers
      GPO FDSys XML | Text
      DEPARTMENT OF AGRICULTURE, Rural Utilities Service
      Proposed rule.
      7 CFR Parts 1753 and 1755