Solid PE Insulated & AP Sheathed (ALPETH) Air Core Cables to GR-421

Applications

The cables are designed for use as subscriber distribution cables and as connection between central offices. The cables are suitable for installation in ducts, direct burial in the ground and also for aerial installation with integral suspension strand. An armoured option is offered for direct burial installations. A figure-8 self support option is offered for aerial installation.

Standards

Telcordia (Bellcore) GR-421

Construction

Conductors Solid annealed bare copper, 0.4/0.5/0.63/0.9mm, as per ASTM B-3/class 1 of IEC 60228.
Insulation Solid medium or high density polyethylene as per ASTM D 1248/IEC 60708.
Twisted Pairs Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk.
Cabling Element Twisted Pairs.
Cable Core Assembly Cables with up to 400 pairs are composed of 25-pair units or 12/13-pair units; cables with over 400 pairs are composed of 50 or 100-pair units. Any extra pairs form a separate unit. Units are identified by colour coded binders. Construction is per GR-421 given in Cable Make Up Diagram.
Core Wrapping One or more non-hygroscopic polyester tapes are helically or longitudinally laid with an overlap. These tapes furnish thermal, mechanical as well as high dielectric protection between hielding and individual conductors.
Moisture Barrier A layer of bare aluminium tape (0.2mm/8mil) is applied longitudinally with overlap over the cable core to provide 100% electrical shielding coverage and ensures a barrier against water vapor. In cables with more than 200 pairs, the aluminum tape may be corrugated for improved cable flexibility.
Sheath Black low density polyethylene as per ASTM D 1248/IEC 60708, being able to withstand exposure to sunlight, temperature variations, ground chemicals and other environmental contaminants.
Ripcord Ripcord may be provided for slitting the sheath longitudinally to facilitate its removal.
Spare Pairs (optional) Spare pairs may be incorporated for large pair cables.
Continuity Wire (optional) One tinned copper drain wire may be longitudinally laid to ensure electrical continuity of the screen.

 

 Telephone Cable - GR-421 GR-421 - Telephone Cables

Optional Construction

Armoured Cable 0.15mm thick corrugated steel tape armour is applied with an overlap over an optional inner polyethylene sheath.
An outer polyethylene sheath is applied over the armour.
Self-Support Cables A 7-strand galvanized steel strand is used as support wire. Black polyethylene sheath covers both core and
support wire in a figure-8 construction.

 

 Telephone Cable - GR-421 GR-421 - Telephone Cables

Abbreviations

LAP (CAP) Copolymer coated aluminium tape + PE sheath
LAPSP (CAPSP) LAP sheath + steel tape armour + PE sheath
AP (ALPETH) Bare aluminium tape + PE sheath
PAP PE inner sheath + bare aluminium tape + PE sheath
PASP PE inner sheath + bare aluminium tape + steel tape armour + PE outer sheath
ASP (STAPETH) Bare aluminium tape + steel tape armour + PE outer sheath
CACSP Copolymer coated aluminum tape + copolymer coated steel tape armour + PE outer sheath
LAPSP Copolymer coated aluminum tape +PE inner sheath + steel tape armour + PE outer sheath
FIGURE 8 LAP Copolymer coated aluminum tape + PE outer sheath + self supporting

Electrical properties

Nominal Conductor Diameter mm 0.4 0.5 0.63 0.9
Conductor Gauge Size AWG 26 24 22 19
Maximum Average DC Resistance Ω/km / Ω/mile 140/225 87/140 55/88.6 27.0/43.4
Maximum Individual DC Resistance Ω/km / Ω/mile 144.2/232 89.5/144 56.5/91.0 28.0/45.0
Minimum Insulation Resistance @500V DC MΩ.km / MΩ.mile 1600/1000 1600/1000 1600/1000 1600/1000
Maximum Average Resistance Unbalance % 1.5 1.5 1.5 1.5
Maximum Individual Resistance Unbalance % 5 5 5 5
Average Mutual Capacitance nF/km / nF/kft

48.5-54.0/

14.8-16.5

48.5-54.0/

14.8-16.5

48.5-54.0/

14.8-16.5

48.5-54.0/

14.8-16.5

Maximum Individual Mutual Capacitance nF/km / nF/kft 57/17.4 57/17.4 57/17.4 57/17.4
Maximum Individual Capacitance Unbalance
pair-to-pair
pF/km / pF/kft 145/44 145/44 145/44 145/44
Capacitance Unbalance RMS pair-to-pair pF/km / pF/kft 45/13.7 45/13.7 45/13.7 45/13.7
Maximum Individual Capacitance Unbalance
pair-to-ground
pF/km / pF/kft 2625/800 2625/800 2625/800 2625/800
Maximum Average Capacitance Unbalance
pair-to-ground
pF/km / pF/kft 574/175 574/175 574/175 574/175
Maximum Conductor Loop Resistance @20°C Ω/km / Ω/mile 300/482 192/309 114/183.6 60/96.4
Impedance @1KHz Ω 994 796 660 445
Impedance @100KHz Ω 147 134 125 122
Impedance @512KHz Ω 120 118 117 116
Impedance @1MHz Ω 117 115 114 113
Maximum Average Attenuation @0.8KHz dB/km / dB/kft 1.64/0.5 1.30/0.39 1.04/0.32 0.74/0.22
Maximum Average Attenuation @1KHz dB/km / dB/kft 1.68/0.51 1.35/0.41 1.08/0.33 0.76/0.23
Maximum Average Attenuation @3KHz dB/km / dB/kft 3.18/0.97 2.52/0.77 2.01/0.61 1.42/0.43
Maximum Average Attenuation @150KHz dB/km / dB/kft 11.4/3.47 8.3/2.53 6.2/1.89 4.4/1.34
Maximum Average Attenuation @772KHz dB/km / dB/kft 24.3/7.4 19.4/5.9 15.4/4.7 10.8/3.3
Maximum Average Attenuation @1000KHz dB/km / dB/kft 27.1/8.25 21.4/6.52 17.5/5.33 12.8/3.89
Dielectric Strength          
    Conductor to Conductor (3secs) V DC 2400 3000 4000 5000
    Conductor to Conductor (3secs) V DC 10000 10000 10000 10000
Minimum EL Far-end Cross-talk-Mean Power Sum          
    @150KHz dB/305m / dB/kft 61 63 63 65
    @772KHz dB/305m / dB/kft 47 49 49 57
    @1.6MHz dB/305m / dB/kft 41 42 43 44
    @3.15MHz dB/305m / dB/kft 35 37 37 39
    @6.3MHz dB/305m / dB/kft 29 31 31 33
Minimum Far-end Cross-talk-Worst Pair Power Sum          
    @150KHz dB/305m / dB/kft 57 57 57 59
    @772KHz dB/305m / dB/kft 43 43 43 45
    @1.6MHz dB/305m / dB/kft 37 37 37 39
    @3.15MHz dB/305m / dB/kft 31 31 31 33
    @6.3MHz dB/305m / dB/kft 25 25 25 27
Minimum Near-end Cross-talk-Mean Power Sum          
    @150KHz dB/305m / dB/kft 58 58 58 58
    @772KHz dB/305m / dB/kft 47 47 47 47
    @1.6MHz dB/305m / dB/kft 43 43 43 43
    @3.15MHz dB/305m / dB/kft 38 38 38 38
    @6.3MHz dB/305m / dB/kft 34 34 34 34
Minimum Near-end Cross-talk-Worst Pair Power Sum          
    @150KHz dB/305m / dB/kft 53 53 53 53
    @772KHz dB/305m / dB/kft 42 42 42 42
    @1.6MHz dB/305m / dB/kft 38 38 38 38
    @3.15MHz dB/305m / dB/kft 33 33 33 33
    @6.3MHz dB/305m / dB/kft 29 29 29 29
Nominal Insulation Thickness mm 0.175 0.2 0.26 0.3
Nominal Insulated Conductor Diameter mm 0.75 0.9 1.15 1.5

 

 Telephone Cable - GR-421 GR-421 - Telephone Cables

Mechanical and thermal properties

Temperature range during operation (fixed state) : -30°C – +70°C

Temperature range during installation (mobile state) : -20°C – +50°C

Minimum bending radius : 10 x Overall Diameter (unarmoured cables) ; 15 x Overall Diameter (armoured cables)

Colour code

Standard colour code is per GR-421 given in Colour Code Chart.

Dimensions and weight

Solid PE Insulated and AP Sheathed (ALPETH) Air Core Cable to GR-421

Cable Code Number of Pairs Nominal Sheath
Thickness
mm/inch
Nominal Overall
Diameter
mm/inch
Nominal Weight
kg/km / lbs/kft
0.4mm Conductor, 0.75mm Insulated Wire
TP421-2Y(A)2Y-25P04 25 1.5/0.059 12.0/0.47 141/95
TP421-2Y(A)2Y-50P04 50 1.5/0.059 14.5/0.57 231/155
TP421-2Y(A)2Y-100P04 100 1.7/0.067 18.5/0.73 394/265
TP421-2Y(A)2Y-200P04 200 1.7/0.067 24.6/0.97 729/490
TP421-2Y(A)2Y-300P04 300 1.8/0.071 28.0/1.10 1034/695
TP421-2Y(A)2Y-400P04 400 1.9/0.075 33.0/1.30 1346/905
TP421-2Y(A)2Y-600P04 600 2.1/0.083 38.1/1.50 1964/1320
TP421-2Y(A)2Y-900P04 900 2.2/0.087 45.7/1.80 2931/1970
TP421-2Y(A)2Y-1200P04 1200 2.4/0.094 53.3/2.10 3868/2600
TP421-2Y(A)2Y-1500P04 1500 2.5/0.098 58.4/2.30 4791/3220
TP421-2Y(A)2Y-1800P04 1800 2.5/0.098 63.5/2.50 5713/3839
TP421-2Y(A)2Y-2000P04 2000 2.5/0.098 66.0/2.60 6348/4266
TP421-2Y(A)2Y-2100P04 2100 2.5/0.098 68.6/2.70 6636/4459
0.5mm Conductor, 0.9mm Insulated Wire
TP421-2Y(A)2Y-25P05 25 1.5/0.059 13.2/0.52 195/131
TP421-2Y(A)2Y-50P05 50 1.5/0.059 16.5/0.65 330/222
TP421-2Y(A)2Y-100P05 100 1.7/0.067 21.8/0.86 590/396
TP421-2Y(A)2Y-200P05 200 1.7/0.067 28.0/1.10 1100/739
TP421-2Y(A)2Y-300P05 300 1.7/0.067 35.6/1.40 1620/1089
TP421-2Y(A)2Y-400P05 400 1.8/0.071 38.1/1.50 2120/1425
TP421-2Y(A)2Y-600P05 600 2.0/0.079 48.3/1.90 3120/2097
TP421-2Y(A)2Y-900P05 900 2.2/0.087 55.9/2.20 4580/3078
TP421-2Y(A)2Y-1200P05 1200 2.4/0.094 63.5/2.50 6070/4079
TP421-2Y(A)2Y-1500P05 1500 2.5/0.098 71.2/2.80 7530/5060
TP421-2Y(A)2Y-1600P05 1600 2.5/0.098 76.2/3.00 7700/5174
TP421-2Y(A)2Y-1800P05 1800 2.5/0.098 78.7/3.10 8985/6038
0.63mm Conductor, 1.15mm Insulated Wire
TP421-2Y(A)2Y-25P063 25 1.5/0.059 15.5/0.61 275/185
TP421-2Y(A)2Y-50P063 50 1.5/0.059 20.1/0.79 476/320
TP421-2Y(A)2Y-100P063 100 1.7/0.067 28.0/1.10 885/595
TP421-2Y(A)2Y-200P063 200 1.7/0.067 38.1/1.50 1666/1120
TP421-2Y(A)2Y-300P063 300 1.7/0.067 43.2/1.70 2455/1650
TP421-2Y(A)2Y-400P063 400 1.8/0.071 48.3/1.90 3229/2170
TP421-2Y(A)2Y-600P063 600 1.9/0.075 58.4/2.30 4791/3220
TP421-2Y(A)2Y-900P063 900 2.1/0.083 71.2/2.80 7082/4759
TP421-2Y(A)2Y-1200P063 1200 2.2/0.087 81.3/3.20 9388/6308
0.9mm Conductor, 1.5mm Insulated Wire
TP421-2Y(A)2Y-25P09 25 1.5/0.059 20.1/0.79 476/320
TP421-2Y(A)2Y-50P09 50 1.5/0.059 28.0/1.10 885/595
TP421-2Y(A)2Y-100P09 100 1.7/0.067 38.1/1.50 1651/1109
TP421-2Y(A)2Y-200P09 200 1.7/0.067 48.3/1.90 3199/2150
TP421-2Y(A)2Y-300P09 300 1.7/0.067 61.0/2.40 4746/3189

Fig 8 Solid PE Insulated & AP Sheathed (Alpeth) Air Core Cable to GR-421

Cable Code Number
of
Pairs
Support Messenger
Wire Diameter
mm/inch
Nominal Sheath
Thickness
mm/inch
Nominal Overall
Dimension
mm/inch
Nominal Weight
kg/km / lbs/kft
0.4mm Conductor, 0.75mm Insulated Wire
TP421-2Y(A)2Y-25P04-SS 25 7/6.35 / 7/0.25 1.5/0.059 14.2/0.56 379/255
TP421-2Y(A)2Y-50P04-SS 50 7/6.35 / 7/0.25 1.5/0.059 16.8/0.66 469/315
TP421-2Y(A)2Y-100P04-SS 100 7/6.35 / 7/0.25 1.7/0.067 20.6/0.81 632/425
TP421-2Y(A)2Y-200P04-SS 200 7/6.35 / 7/0.25 1.7/0.067 25.4/1.00 952/640
TP421-2Y(A)2Y-300P04-SS 300 7/6.35 / 7/0.25 1.8/0.071 30.5/1.20 1257/845
0.5mm Conductor, 0.9mm Insulated Wire
TP421-2Y(A)2Y-25P05-SS 25 7/6.35 / 7/0.25 1.5/0.059 16.0/0.63 431/290
TP421-2Y(A)2Y-50P05-SS 50 7/6.35 / 7/0.25 1.5/0.059 19.3/0.76 565/380
TP421-2Y(A)2Y-100P05-SS 100 7/6.35 / 7/0.25 1.7/0.067 24.6/0.97 826/555
TP421-2Y(A)2Y-200P05-SS 200 7/6.35 / 7/0.25 1.7/0.067 30.5/1.20 1317/885
0.63mm Conductor, 1.15mm Insulated Wire
TP421-2Y(A)2Y-25P063-SS 25 7/6.35 / 7/0.25 1.5/0.059 17.8/0.70 513/345
TP421-2Y(A)2Y-50P063-SS 50 7/6.35 / 7/0.25 1.5/0.059 22.4/0.88 714/480
TP421-2Y(A)2Y-100P063-SS 100 7/6.35 / 7/0.25 1.7/0.067 30.5/1.20 1116/750
0.9mm Conductor, 1.5mm Insulated Wire
TP421-2Y(A)2Y-25P09-SS 25 7/6.35 / 7/0.25 1.5/0.059 22.4/0.88 714/480
TP421-2Y(A)2Y-50P09-SS 50 7/6.35 / 7/0.25 1.5/0.059 30.5/1.20 1108/745

Solid PE Insulated & PAP Sheathed Air Core Cable to GR-421

Cable Code Number of
Pairs
Nominal Sheath Thickness Nominal Overall
Diameter
mm/inch
Nominal
Weight
kg/km/lbs/kft
Inner Outer
mm/inch mm/inch
0.4mm Conductor, 0.75mm Insulated Wire
TP421-2Y2Y(A)2Y-50P04 50 1.2/0.047 1.5/0.059 16.0/0.630 275/185
TP421-2Y2Y(A)2Y-100P04 100 1.2/0.047 1.5/0.059 20.0/0.787 446/300
TP421-2Y2Y(A)2Y-200P04 200 1.2/0.047 1.5/0.059 25.0/0.984 781/525
TP421-2Y2Y(A)2Y-400P04 400 1.2/0.047 1.5/0.059 34.0/1.34 1443/970
TP421-2Y2Y(A)2Y-600P04 600 1.6/0.063 2.0/0.079 40.0/1.57 2098/1410
TP421-2Y2Y(A)2Y-900P04 900 1.6/0.063 2.0/0.079 48.0/1.89 3043/2045
TP421-2Y2Y(A)2Y-1200P04 1200 1.6/0.063 2.0/0.079 54.0/2.13 4010/2695
0.5mm Conductor, 0.9mm Insulated Wire
TP421-2Y2Y(A)2Y-25P05 25 1.2/0.047 1.5/0.059 16.0/0.630 251/169
TP421-2Y2Y(A)2Y-50P05 50 1.2/0.047 1.5/0.059 18.0/0.709 380/255
TP421-2Y2Y(A)2Y-100P05 100 1.2/0.047 1.5/0.059 23.0/0.906 640/430
TP421-2Y2Y(A)2Y-200P05 200 1.6/0.063 1.8/0.071 30.0/1.18 1146/770
TP421-2Y2Y(A)2Y-300P05 300 1.6/0.063 1.8/0.071 36.0/1.42 1682/1130
TP421-2Y2Y(A)2Y-400P05 400 1.6/0.063 2.0/0.079 41.0/1.61 2195/1475
TP421-2Y2Y(A)2Y-600P05 600 1.8/0.071 2.3/0.090 49.0/1.93 3215/2160
TP421-2Y2Y(A)2Y-900P05 900 2.0/0.079 2.5/0.098 59.0/2.32 4747/3190
TP421-2Y2Y(A)2Y-1200P05 1200 2.2/0.079 2.7/0.106 67.0/2.64 6198/4165
0.63mm Conductor, 1.15mm Insulated Wire
TP421-2Y2Y(A)2Y-25P063 25 1.2/0.047 1.5/0.059 17.0/0.669 320/215
TP421-2Y2Y(A)2Y-50P063 50 1.2/0.047 1.5/0.059 22.0/0.866 535/360
TP421-2Y2Y(A)2Y-100P063 100 1.2/0.047 1.5/0.059 28.0/1.10 945/635
TP421-2Y2Y(A)2Y-200P063 200 1.6/0.063 2.0/0.079 37.0/1.46 1771/1190
TP421-2Y2Y(A)2Y-400P063 400 1.8/0.071 2.3/0.091 51.0/2.01 3363/2260
TP421-2Y2Y(A)2Y-600P063 600 2.0/0.079 2.5/0.098 62.0/2.44 5015/3370
0.9mm Conductor, 1.5mm Insulated Wire
TP421-2Y2Y(A)2Y-25P09 25 1.2/0.047 1.5/0.059 21.0/0.827 528/355
TP421-2Y2Y(A)2Y-50P09 50 1.2/0.047 1.5/0.059 27.0/1.06 930/625
TP421-2Y2Y(A)2Y-100P09 100 1.6/0.063 2.0/0.079 36.0/1.42 1741/1170
TP421-2Y2Y(A)2Y-200P09 200 1.8/0.071 2.3/0.091 50.0/1.97 3319/2230

 

 Telephone Cable - GR-421 GR-421 - Telephone Cables
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