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Busbar Tubes |
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Heat Shrink Bus Bar Tube GMB and GHB 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.
Prevent Busbar from chemical corrosion effected by strong acid, alkali, salt etc.
Solve the problem of insulation among Busbar in Bus Duct.
Helogen free, flame retardant
High dielectric strength.
Highly Flexible for use on straight or angled bars without creasing. |
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| Thin Wall Tube[ Up to 1KV ] |
All dimensions are in mm |
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| Gala Size |
D |
d |
T(+10%) |
Reel length |
Rectangular Bars
(L+W) |
Round Bar |
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mm(min.) |
mm(max.) |
mm |
mtrs. |
Min. max. |
Min. max. |
| GTB 15/7.5 |
15 |
7.5 |
0.69 |
50 |
12 18 |
8 12 |
| GTB 20/10 |
20 |
10 |
0.78 |
50 |
16 27 |
12 17 |
| GTB 30/15 |
30 |
15 |
0.86 |
50 |
23 41 |
18 26 |
| GTB 35/17.5 |
35 |
17.5 |
0.90 |
50 |
31 51 |
20 32 |
| GTB 40/20 |
40 |
20 |
0.96 |
25 |
34 57 |
23 36 |
| GTB 50/25 |
50 |
25 |
0.96 |
25 |
51 73 |
28 46 |
| GTB 60/30 |
60 |
30 |
0.96 |
25 |
53 87 |
34 55 |
| GTB 70/35 |
70 |
35 |
1.10 |
25 |
71 103 |
38 65 |
| GTB 80/40 |
80 |
40 |
1.27 |
25 |
78 120 |
46 76 |
| GTB 90/45 |
90 |
45 |
1.35 |
25 |
87 132 |
49 84 |
| GTB 100/50 |
100 |
50 |
1.40 |
25 |
102 147 |
55 93 |
| GTB 150/75 |
150 |
75 |
1.50 |
25 |
119 220 |
80 140 |
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| Medium Wall Tube[ Up to 24KV ] |
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| Gala Size |
D |
d |
T(+10%) |
Spool length |
Rectangular Bars
(L+W) |
Round Bar |
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mm(min.) |
mm(max.) |
mm |
mtrs. |
Min. max. |
Min. max. |
| GMB 16/6 |
16 |
6 |
2.5 |
30 |
12 18 |
6.5 12 |
| GMB 25/8 |
25 |
8 |
2.5 |
30 |
16 30 |
9 20 |
| GMB 30/12 |
30 |
12 |
2.5 |
30 |
22 38 |
13.5 25 |
| GMB 40/16 |
40 |
16 |
2.5 |
30 |
29 52 |
18 35 |
| GMB 50/20 |
50 |
20 |
2.5 |
30 |
36 65 |
22 43 |
| GMB 75/28 |
75 |
28 |
3.0 |
15 |
55 95 |
33 63 |
| GMB 100/38 |
100 |
38 |
3.0 |
15 |
70 130 |
44 86 |
| GMB 125/45 |
120 |
45 |
3.0 |
12 |
90 165 |
55 105 |
| GMB 140/52 |
140 |
52 |
3.0 |
1.5 |
100 180 |
64 118 |
| GMB 160/60 |
160 |
60 |
3.0 |
1.5 |
110 210 |
70 130 |
| GMB 180/65 |
180 |
65 |
3.0 |
1.5 |
125 235 |
80 150 |
| GMB 205/85 |
205 |
85 |
3.0 |
1.5 |
200 276 |
127 190 |
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| Heavy Wall Tube[ Up to 36KV ] |
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| Gala Size |
D |
d |
T(+10%) |
Spool length |
Rectangular Bars
(L+W) |
Round Bar |
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mm(min.) |
mm(max.) |
mm |
mtrs. |
Min. max. |
Min. max. |
| GHB 25/8 |
25 |
8 |
3.7 |
20 |
17 28 |
11 20 |
| GHB 30/12 |
30 |
12 |
4.0 |
20 |
21 33 |
15 25 |
| GHB 40/16 |
40 |
16 |
4.0 |
20 |
28 45 |
18 32 |
| GHB 50/20 |
50 |
20 |
4.0 |
20 |
34 54 |
24 40 |
| GHB 75/28 |
75 |
28 |
4.0 |
15 |
47 69 |
28 47 |
| GHB 100/38 |
100 |
38 |
4.2 |
15 |
69 102 |
44 72 |
| GHB 120/45 |
120 |
45 |
4.2 |
12 |
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| GHB 140/52 |
140 |
52 |
4.2 |
1.5 |
97 145 |
57 96 |
| GHB 160/60 |
160 |
60 |
4.5 |
1.5 |
102 168 |
65 105 |
| GHB 180/65 |
180 |
65 |
4.5 |
1.5 |
133 196 |
85 125 |
| GTB 90/45 |
90 |
45 |
1.35 |
25 |
87 132 |
49 84 |
| GTB 100/50 |
100 |
50 |
1.40 |
25 |
102 147 |
55 93 |
| GTB 150/75 |
150 |
75 |
1.50 |
25 |
119 220 |
80 140 |
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PROPERTIES |
VALUE |
STANDARD |
Physical |
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| Tensile Strength |
10 N/mm2 (MPA) (min.) |
ASTM D638 |
| Ultimate Elongation |
300% (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 |
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| Accelerated Ageing |
(120oC for 500 Hrs) |
ASTM D2671 |
| Tensile Strength |
8 N/mm2 (Mpa) (min.) |
ASTM D 638 |
| Ultimate Elongation |
250% (Min.) |
ASTM D 638 |
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 + 105oC |
IEC 216 |
Electrical |
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| Dielectric Strength |
18 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 |
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| CLEARANCES WITH INSULATION |
| Voltage |
Medium wall Tube (GMB) |
Heavy Wall Tube (GHB) |
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 |
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