Heat Shrink Bus Bar Tubes
Heat Shrink Bus Bar Tube PEMB and PEHB are red coloured medium wall and heavy wall unlined tubes designed to insulate busbar systems upto 36 KV and to protect against accidental flashover. The tubes are manufactured from high quality non tracking crosslinked polyolefin material. Meets ANSI C37.20.2 standards for MV switchgear application up to 36 KV.
- Reduces Busbar clearance.
- High dielectric strength.
- Halogen free, flame retardant.
Technical Specification
Properties
|
Value
|
Standard
|
Physical
|
|
|
Tensile Strength
|
10 N/mm2 (Mpa) (min.)
|
ASTM D638
|
Ultimate Elongation
|
350% (min)
|
ASTM D638 |
Longitudinal Change
|
-10% (max.)
|
ASTM D2671
|
Density
|
1.20+0.2 gm/cm3
|
ASTM D792 |
Hardness
|
45+10 Shore D
|
ASTM D2240 |
Water absorption
|
0.5% (max.)
|
ASTM D570 |
Thermal
|
|
|
Accelerated ageing
|
(120oC for 500 hrs) |
ASTM D2671 |
Tensile Strength
|
8 N/mm2 (Mpa) (min.) |
ASTM D638 |
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
|
-40 to +105oC
|
IEC 216
|
Electrical
|
|
|
Dielectric Strength
|
18 KV/mm. (min)
|
ASTM D149
|
Volume Resistivity
|
1 x 1014Ohm.cm (max)
|
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
|
Selection Chart (Medium Wall)
Code
|
D min
(min)
|
d max.
(mm)
|
T +10%
(mm)
|
Spool length
(mtr)
|
PEMB
|
16
|
6
|
2.5
|
30
|
| PEMB |
25
|
8
|
2.5
|
30
|
| PEMB |
30
|
12
|
2.5
|
30
|
| PEMB |
40
|
16
|
2.5
|
30
|
| PEMB |
50
|
20
|
2.5
|
30
|
| PEMB |
75
|
28
|
3.0
|
15
|
| PEMB |
100
|
38
|
3.0
|
15
|
| PEMB |
120
|
45
|
3.0
|
12
|
| PEMB |
140
|
52
|
3.0
|
1.5
|
| PEMB |
160
|
60
|
3.0
|
1.5
|
| PEMB |
180
|
65
|
3.0
|
1.5
|
| PEMB |
205
|
85
|
3.0
|
1.5
|
Selection Chart (Heavy Wall)
Code
|
D min
(min)
|
d max.
(mm)
|
T +10%
(mm)
|
Spool length
(mtr)
|
PEHB 25/8
|
25
|
8
|
3.7
|
20
|
PEMB 30/12
|
30
|
12
|
4.0
|
20
|
PEMB 40/16
|
40
|
16
|
4.0
|
20
|
PEMB 50/20
|
50
|
20
|
4.0
|
20
|
PEMB 75/28
|
75
|
28
|
4.0
|
15
|
PEMB 100/38
|
100
|
38
|
4.2
|
15
|
PEMB 120/45
|
120
|
45
|
4.2
|
12
|
PEMB 140/52
|
140
|
52
|
4.2
|
1.5
|
PEMB 160/60
|
160
|
60
|
4.5
|
1.5
|
PEMB 180/65
|
180
|
65
|
4.5
|
1.5
|
All dimensions are in mm D, d : Internal diameter ; T : Thickness
Clearances With Insulation
Voltage
|
Medium Wall Tube (PEMB)
|
Heavy Wall Tube (PEHB)
|
Un-Insulated Bus Bars
|
Ph. To Ph.
|
Ph. To gr.
|
Ph. To Ph.
|
Ph. To gr.
|
12 KV
|
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
|
|
