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Duplex Service Drop

SERVICE DROP CABLE

Duplex Service Drop ANSI/ICEA S-76-474

Duplex Service Drop Cable to ANSI/ICEA S-76-474 is a neutral-supported overhead assembly of one XLPE-insulated aluminium phase conductor twisted around a bare neutral messenger. The TDS lists 27 code words with phase conductors from 6 AWG to 1/0 AWG, with Aluminium 1350, Aluminium Alloy 6201-T81 or ACSR neutrals.

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ANSI/ICEA S-76-474 covers assemblies of extruded-insulated phase conductors with a bare or covered neutral, made as weather-resistant cables hung from supporting structures to distribute electrical energy overhead (ANSI/ICEA S-76-474 Clause 1.1). It applies to neutral-supported service drop cables and secondary distribution cables, used on circuits of no more than 600 V phase to phase or 480 V phase to ground, with a conductor rating of 75 °C or 90 °C (ANSI/ICEA S-76-474 Clause 1.1). The cables on this page have one or more insulated phase conductors laid up with a neutral (ANSI/ICEA S-76-474 Clause 1.2); the duplex form carries one phase conductor.

Construction

  • Phase conductors: Aluminium 1350; sizes 6 and 4 AWG may be solid, larger sizes are Class A, Class B or single input wire stranded, compressed or compact (ANSI/ICEA S-76-474 Clause 2.2.1); all wires in a stranded conductor are of the same material and temper (ANSI/ICEA S-76-474 Clause 2.2)
  • Insulation: A single layer of black weather-resistant crosslinked polyethylene for 90 °C service, with a maximum average carbon black particle size of 35 nm (ANSI/ICEA S-76-474 Clauses 3.1 and 3.1.2); a separator, if used, is opaque or coloured (ANSI/ICEA S-76-474 Clause 3.1)
  • Neutral messenger: Bare, reverse-lay stranded, outer layer right-hand; size and type follow Table 2-6 (ANSI/ICEA S-76-474 Clause 2.3)
  • Aluminium 1350 neutral: Hard drawn, Class A stranded; 3/0 and 4/0 AWG may also be Class B (ANSI/ICEA S-76-474 Clause 2.3.1.2)
  • ACSR neutral: 6 AWG to 4/0 AWG as 6 aluminium wires around a single steel wire; 266.8 to 477 kcmil as 18 aluminium wires around one steel wire (ANSI/ICEA S-76-474 Clause 2.3.1.3)
  • Aluminium alloy 6201-T81 neutral: 7 wires for 30.58 to 246.9 kcmil, 19 wires for 312.8 to 559.5 kcmil (ANSI/ICEA S-76-474 Clause 2.3.1.1)
  • Twisted assembly: Phase conductors twisted around the neutral without fillers, lay 25 to 60 times the finished diameter of one phase conductor, in the same direction as the neutral outer layer (ANSI/ICEA S-76-474 Clause 4.1.1)

Operating Temperatures

Insulation Rating Normal Operation Emergency Overload Short Circuit
90 °C (crosslinked) 90 °C 130 °C 250 °C

The emergency overload temperature may be reached for no more than 100 hours in any twelve consecutive months, and 500 hours over the service life (ANSI/ICEA S-76-474 Clause 1.4.2). Where the thermal surroundings of the line are not well known, the standard advises lowering the permissible conductor temperature by 10 °C (ANSI/ICEA S-76-474 Clause 1.4).

Insulation Thickness

Phase Conductor Size Minimum at Any Point Nominal (for information)
8 to 2 AWG 41 mils (1.0 mm) 45 mils (1.1 mm)
1 to 4/0 AWG 54 mils (1.4 mm) 60 mils (1.5 mm)
250 to 477 kcmil 72 mils (1.8 mm) 80 mils (2.0 mm)

These are the Table 3-1 values; the TDS gives the nominal thickness applied to each code word.

Typical Applications

  • Overhead service drops from the distribution line to the building, on circuits up to 600 V phase to phase
  • Overhead secondary distribution circuits supported by the neutral messenger

Duplex Service Drop Cable to ANSI/ICEA S-76-474 hangs from its bare neutral, which also serves as the return conductor. The main data are summed up below; every code word is listed in the TDS tab.

Technical Characteristics

Applicable Standard ANSI/ICEA S-76-474
Standard Scope Neutral-supported service drop and secondary distribution cables for overhead use
Rated Voltage 600 V phase to phase (480 V phase to ground)
Assembly Duplex: one insulated phase conductor twisted around a bare neutral messenger
Phase Conductor Aluminium 1350, 6 AWG to 1/0 AWG
Insulation Black crosslinked polyethylene (XLPE), 90 °C
Nominal Insulation Thickness 1.14 mm to 1.52 mm
Neutral Messenger Aluminium 1350, Aluminium Alloy 6201-T81, ACSR
Max. Conductor Temperature 90 °C normal, 130 °C emergency overload, 250 °C short circuit
Approx. Cable Diameter 11.1 mm to 22.5 mm
Approx. Mass 92 kg/km to 425 kg/km

Ordering Information

Please state the code word or the phase size, neutral type and size; the quantity and length per reel; and whether the optional conductor identification legend is wanted.

Aluminium 1350 Phase Conductors, XLPE Insulated, with Aluminium 1350 Neutral

Code Word Phase Conductor Bare Neutral Messenger Approx. Cable Diameter Approx. Mass
Size Number of Wires Nominal Insulation Thickness Size Number of Wires Wire Diameter
AWG or kcmil No. mm AWG or kcmil No. mm mm kg/km
Pekingese 6 1 1.14 6 7 1.56 11.1 92
Collie 6 7 1.14 6 7 1.56 11.5 94
Cocker 6 7 1.52 6 7 1.56 12.2 100
Dachshund 4 1 1.14 4 7 1.96 13.4 140
Spaniel 4 7 1.14 4 7 1.96 13.9 143
Cairn 4 7 1.52 4 7 1.96 14.6 150
Doberman 2 7 1.14 2 7 2.47 16.9 220
Airedale 1 19 1.52 1 7 2.78 19.6 280
Basset 1/0 7 1.52 1/0 7 3.12 21.8 355
Malemute 1/0 19 1.52 1/0 7 3.12 21.6 350

Aluminium 1350 Phase Conductors, XLPE Insulated, with Aluminium Alloy 6201-T81 Neutral

Code Word Phase Conductor Bare Neutral Messenger Approx. Cable Diameter Approx. Mass
Size Number of Wires Nominal Insulation Thickness Size Number of Wires Wire Diameter
AWG or kcmil No. mm AWG or kcmil No. mm mm kg/km
Chihuahua 6 1 1.14 30.58 7 1.68 11.4 98
Vizsla 6 7 1.14 30.58 7 1.68 11.8 100
Harrier 4 1 1.14 48.69 7 2.12 13.8 149
Whippet 4 7 1.14 48.69 7 2.12 14.4 154
Schnauzer 2 7 1.14 77.47 7 2.67 17.5 235
Afghan 1/0 7 1.52 123.3 7 3.37 22.5 378
Heeler 1/0 19 1.52 123.3 7 3.37 22.3 375

Aluminium 1350 Phase Conductors, XLPE Insulated, with ACSR Neutral

Code Word Phase Conductor Bare Neutral Messenger Approx. Cable Diameter Approx. Mass
Size Number of Wires Nominal Insulation Thickness Size Number of Wires Wire Diameter
AWG or kcmil No. mm AWG or kcmil No. mm mm kg/km
Setter 6 1 1.14 6 6/1 1.68 11.4 109
Shepherd 6 7 1.14 6 6/1 1.68 11.8 112
Retriever 6 7 1.52 6 6/1 1.68 12.6 119
Eskimo 4 1 1.14 4 6/1 2.12 13.8 166
Terrier 4 7 1.14 4 6/1 2.12 14.4 170
Yorkshire 4 7 1.52 4 6/1 2.12 15.1 180
Chow 2 7 1.14 2 6/1 2.67 17.5 262
Labrador 1 19 1.52 1 6/1 3.00 20.2 339
Bloodhound 1/0 7 1.52 1/0 6/1 3.37 22.5 425
Bull 1/0 19 1.52 1/0 6/1 3.37 22.3 422

Phase conductors of 1 AWG and 300 kcmil are listed as built; Table 2-6 of the standard gives no neutral size for these phase sizes.

Conductor Tests

  • In accordance with ANSI/ICEA S-76-474 Clause 2.7.1, dc resistance is measured to an accuracy of 2% or better and corrected to 25 °C.
  • In accordance with ANSI/ICEA S-76-474 Clause 2.3.3, a strength test on the neutral taken from the finished assembly is made only when agreed at the time of order; the neutral then breaks at no less than its rated strength in the free length, or no less than 95% of it inside or within one inch of a grip.

Insulation Tests

  • In accordance with ANSI/ICEA S-76-474 Clause 3.4.1, insulation resistance at or corrected to 1000 ft and 15.6 °C is not below the value set by an IR constant of 10,000 for 90 °C insulation.
  • In accordance with ANSI/ICEA S-76-474 Clause 3.4.2, each finished length passes either 3000 V ac for one minute between phase conductors and water after 30 minutes immersion, or a spark test of 8.5 kV ac or 13.0 kV dc with the neutral isolated.
  • In accordance with ANSI/ICEA S-76-474 Clause 3.5.1, the minimum insulation thickness at any point is not below the Table 3-1 value.
  • In accordance with ANSI/ICEA S-76-474 Clause 3.6.1, the insulation meets the physical properties of Table 3-4; for crosslinked material these include 12.5 MPa minimum tensile strength and 250% minimum elongation, with at least 75% retained after 168 h at 121 °C.

Qualification

  • In accordance with ANSI/ICEA S-76-474 Clause 1.5, qualification tests are made on cable specimens at the start and whenever an insulating material is changed, and the data are kept.
  • In accordance with ANSI/ICEA S-76-474 Clause 6.2, a specimen bent 180 degrees round a mandrel of no more than seven times the cable diameter shows no cracks after 96 h at 100 °C.
  • In accordance with ANSI/ICEA S-76-474 Clause 6.3, insulation with less than 2.0% carbon black is tested for sunlight resistance over 720 h of carbon-arc or xenon-arc exposure.

Identification

  • In accordance with ANSI/ICEA S-76-474 Clause 4.2.1, when a print legend is used, it is repeated at no more than 24 in (0.61 m) and includes the conductor size, conductor metal and the 600 V rating among its required items.

Product Inquiry

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Please send your required cable designation, number of conductors, nominal cross-section, support cable type, rated voltage, packing length, and project standard.

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