SwitchgearHV Heat Shrink Sleeve
Bus Tube is heat shrinkable tube designed to insulate busbar systems up to 33 KV & to protect against accidental flashover.
| Size | As Supplied | After Recovery | T (±10% ) | Reel length | Rectangular Bars (W+B) | Round Bar Ø | ||
|---|---|---|---|---|---|---|---|---|
| MM (min.) | MM (max.) | MM | Meters | Min | Max | Min | Max | |
| NHB 25/8 | 25.00 | 8.00 | 3.70 | 25.00 | 17.00 | 28.00 | 11.00 | 20.00 |
| NHB 30/12 | 30.00 | 12.00 | 4.00 | 25.00 | 21.00 | 33.00 | 15.00 | 25.00 |
| NHB 40/16 | 40.00 | 16.00 | 4.00 | 25.00 | 28.00 | 45.00 | 15.00 | 32.00 |
| NHB 50/20 | 50.00 | 20.00 | 4.00 | 25.00 | 34.00 | 54.00 | 24.00 | 40.00 |
| NHB 65/25 | 65.00 | 25.00 | 4.00 | 25.00 | 41.00 | 62.00 | 27.00 | 43.00 |
| NHB 75/28 | 75.00 | 28.00 | 4.00 | 20.00 | 47.00 | 69.00 | 28.00 | 47.00 |
| NHB 85/32 | 85.00 | 32.00 | 4.00 | 20.00 | 58.00 | 100.00 | 37.00 | 68.00 |
| NHB 100/38 | 100.00 | 38.00 | 4.20 | 20.00 | 69.00 | 102.00 | 44.00 | 72.00 |
| NHB 120/45 | 120.00 | 45.00 | 4.20 | 15.00 | 83.00 | 125.00 | 50.00 | 85.00 |
| NHB 150/60 | 150.00 | 60.00 | 4.50 | 15.00 | 102.00 | 168.00 | 65.00 | 105.00 |
| NHB 180/70 | 180.00 | 70.00 | 4.50 | 15.00 | 133.00 | 196.00 | 85.00 | 125.00 |
| NHB 205/85 | 205.00 | 85.00 | 4.50 | 15.00 | 200.00 | 250.00 | 127.00 | 164.00 |
| NHB 250/120 | 250.00 | 120.00 | 4.50 | 15.00 | 220.00 | 314.00 | 140.00 | 200.00 |
| Test Description | Recorded Value | Test Method |
|---|---|---|
| Physical | ||
| Tensile Strength | 12 N/mm2 (MPA)(min.) | ASTM D638 |
| Ultimate Elongation | 300% (Min.) | ASTM D638 |
| Water Absorption | 0.5 % (max.) | ASTM D570 |
| Density | 1.20 ± 0.2 gm/cm3 | ASTM D792 |
| Hardness | 45 ? 10 Shore D | ASTM D2240 |
| Thermal | ||
| Accelerated Ageing | (120oC for 500 Hrs) | ASTM D2671 |
| Tensile Strength | 10 N/mm2 (Mpa) (min.) | ASTM D 638 |
| Ultimate Elongation | 250%(Min.) | ASTM D638 |
| Low temperature Flexibility (-40oC for 4 Hrs.) | No Cracking | ASTM D2671 |
| Heat Shock (250oC for 30 Min.) | No Cracking or flowing | ESI 09-11 |
| Shrink Temperature | 125oC | IEC 216 |
| Continuous Temperature limit | -40oC to + 110oC | IEC 216 |
| Electrical | ||
| Dielectric Strength | 22 KV/mm. (Min.) | ASTM D149 |
| Volume Resistivity | 1 x 1014 Ohm.cm(min.) | ASTM D257 |
| Dielectric Constant | 5 (Max.) | ASTM D150 |
| Resistant to track & erosion | No Tracking, erosion or flame failure upto 3.25 KV for 20 min. | ASTM D2303 |
| CLEARANCES WITH INSULATION | |||||
|---|---|---|---|---|---|
| Voltage | Medium wall Tube (NMB) | Heavy Wall Tube (NHB) | UN-Insulated Bus bars | ||
| Ph. To Ph. | Ph. to gr. | Ph. To Ph. | Ph. to gr. | ||
| 12KV | 65 | 75 | 35 | 45 | 120 |
| 17.5 KV | 85 | 105 | 55 | 65 | 160 |
| 24 KV | 115 | 150 | 70 | 100 | 220 |
| 36 KV | 200 | 285 | 140 | 190 | 320 |
- Reduce Busbar clearance.
- Prevent Busbar from chemical corrosion effected by strong acid, alkali, salt etc.
- Solve the problem of insulation among Busbar in Bus Duct.
- Halogen free, flame retardant.
- High dielectric strength.
- Highly Flexible for use on straight or angled bars without creasing.