Technical specification
Specification for wires & cables under IS 694.
Reference data for engineers, consultants and contractors — dimensions, current ratings and rating factors for ATC PVC insulated cables.
IS 694 · IS 8130
Construction of conductor
| Material | Nominal cross-sectional area | Solid / Stranded | Flexibility class |
|---|---|---|---|
| Copper | Up to and including 6 mm² | Solid / Stranded | Class 1 or Class 2 of IS 8130 |
| Copper | Above 6 mm² | Stranded | Class 2 of IS 8130 |
| Aluminium | Up to and including 6 mm² | Solid / Stranded | Class 1 or Class 2 of IS 8130 |
| Aluminium | Above 6 mm² | Stranded | Class 2 of IS 8130 |
Table 1
Single core PVC insulated unsheathed cables
| Area (mm²) | Insulation (mm) | Max. OD (mm) |
|---|---|---|
| 1* | 0.7 | 3.2 |
| 1.5 | 0.7 | 3.4 |
| 2.5 | 0.8 | 4.2 |
| 4 | 0.8 | 4.8 |
| 6 | 0.8 | 5.6 |
| 10 | 1.0 | 7.0 |
| 16 | 1.0 | 8.2 |
| 25 | 1.2 | 10.0 |
| 35 | 1.2 | 11.5 |
| 50 | 1.4 | 13.0 |
| Area (mm²) | Insulation (mm) | Max. OD (mm) |
|---|---|---|
| 70 | 1.4 | 15.0 |
| 95 | 1.6 | 17.5 |
| 120 | 1.6 | 19.0 |
| 150 | 1.8 | 21.0 |
| 185 | 2.0 | 23.0 |
| 240 | 2.2 | 26.5 |
| 300 | 2.4 | 29.5 |
| 400 | 2.6 | 33.5 |
| 500 | 2.8 | 37.5 |
| 600 | 2.8 | 42.0 |
* For copper conductors only.
Table 2
PVC insulated sheathed cables — thickness & overall dimensions (mm)
| Area (mm²) | Insulation (mm) | Sheath · 1C | Sheath · 2C | Sheath · 3C | Sheath · 4C | OD · 1C | OD · 2C round | OD · 2C flat | OD · 3C | OD · 4C |
|---|---|---|---|---|---|---|---|---|---|---|
| 1* | 0.6 | 0.8 | 0.9 | 0.9 | 0.9 | 4.7 | 8.2 | 7.8 × 5.0 | 8.6 | 9.2 |
| 1.5 | 0.6 | 0.8 | 0.9 | 0.9 | 0.9 | 5.0 | 8.8 | 8.4 × 5.4 | 9.2 | 10.0 |
| 2.5 | 0.7 | 0.8 | 1.0 | 1.0 | 1.0 | 5.8 | 10.5 | 10.0 × 6.4 | 11.0 | 12.0 |
| 4 | 0.8 | 0.9 | 1.0 | 1.1 | 1.1 | 6.8 | 12.0 | 11.5 × 7.2 | 13.0 | 14.0 |
| 6 | 0.8 | 0.9 | 1.1 | 1.1 | 1.2 | 7.8 | 13.5 | 13.0 × 8.0 | 14.5 | 15.5 |
| 10 | 1.0 | 0.9 | 1.2 | 1.2 | 1.3 | 8.8 | 16.5 | 16.0 × 9.6 | 17.5 | 19.5 |
| 16 | 1.0 | 1.0 | 1.3 | 1.3 | 1.4 | 10.5 | 19.0 | 18.5 × 11.0 | 20.0 | 22.5 |
| 25 | 1.2 | 1.1 | 1.5 | 1.5 | 1.6 | 12.5 | 23.0 | 22.0 × 13.0 | 24.5 | 27.5 |
| 35 | 1.2 | 1.1 | 1.6 | 1.6 | 1.7 | 13.5 | 25.5 | 25.0 × 14.5 | 27.5 | 30.5 |
| 50 | 1.4 | 1.2 | 1.7 | 1.7 | 1.8 | 15.5 | 29.5 | 29.0 × 16.5 | 31.5 | 35.0 |
* For copper conductors only. 2C flat dimensions are major × minor axis.
Table 3
Single core unsheathed cable — 1100 V grade
| Area (mm²) | No. / dia. of wire (mm) | Insulation (mm) | Approx. OD (mm) | In conduit / trunking (A) | Clipped / on tray (A) | Max. resistance @ 20 °C (Ω/km) |
|---|---|---|---|---|---|---|
| 0.75 | 24 / 0.20 | 0.6 | 2.4 | 7 | — | — |
| 1.0 | 14 / 0.30 | 0.7 | 2.8 | 11 | 12 | 18.1 |
| 1.5 | 22 / 0.30 | 0.7 | 3.1 | 13 | 16 | 12.1 |
| 2.5 | 36 / 0.30 | 0.8 | 3.8 | 18 | 22 | 7.41 |
| 4.0 | 56 / 0.30 | 0.8 | 4.4 | 24 | 29 | 4.95 |
| 6.0 | 84 / 0.30 | 0.8 | 5.2 | 31 | 37 | 3.30 |
Standard colours: Black, Red, Blue and Green (earthing). Supplied in 90 m lengths. Current ratings as per IS 3961 (Part V) 1968; conductor Class 2 of IS 8130.
Current carrying capacity
Assumptions & rating factors
Current ratings in the tables are based on the following assumptions:
- Maximum conductor temperature
- 70 °C
- Thermal resistivity of soil
- 150 °C cm/W
- Thermal resistivity of PVC
- 650 °C cm/W
- Ground temperature
- 30 °C
- Ambient air temperature
- 40 °C
Depth of laying is measured to the highest point of the cable laid direct in ground, or to the top surface of ducts.
Depth of laying — 1100 V grade
| Depth of laying (cm) | 75 | 90 | 105 | 120 | 150 | 180+ |
|---|---|---|---|---|---|---|
| Up to 25 mm² | 1.00 | 0.99 | 0.98 | 0.97 | 0.96 | 0.95 |
| 25 – 300 mm² | 1.00 | 0.98 | 0.97 | 0.96 | 0.94 | 0.93 |
| Above 300 mm² | 1.00 | 0.97 | 0.96 | 0.95 | 0.92 | 0.91 |
Variation in ground temperature
| Ground temp. (°C) | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
|---|---|---|---|---|---|---|---|---|
| Rating factor | 1.17 | 1.12 | 1.06 | 1.00 | 0.94 | 0.87 | 0.79 | 0.71 |
Variation in ambient air temperature
| Ambient temp. (°C) | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
|---|---|---|---|---|---|---|---|
| Rating factor | 1.33 | 1.25 | 1.16 | 1.09 | 1.00 | 0.90 | 0.80 |
IS 1554
Core identification & product codes
Core colours
- Single core
- 2 core
- 3 core
- 3½ core
- 4 core
- 5 core
3½ core: the reduced neutral core is black. Above 5 cores, two adjacent cores in each layer are blue (reference) and yellow (direction); the remaining cores are grey.
Product code letters
- AAluminium conductor (no letter for copper)
- YPVC insulation / PVC outer sheath
- 2XXLPE insulation
- WSteel round wire armour
- FSteel strip armour
- WWSteel double round wire armour
- FFSteel double strip armour
- AWAluminium wire armour
Examples: A2XFY — aluminium, XLPE, strip armoured, PVC sheath · 2XY — copper XLPE unarmoured. The product code is stencilled on the drum flange.
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