Busbar Tubes — BUSTUBE Selection Chart
The BUSTUBE size chart: GSC (Thin Wall, to 3.3 kV), GMB (Medium Wall, to 24 kV) and GHB (Heavy Wall, to 36 kV) series dimensions for rectangular (width + breadth) and round busbars.
- ANSI C37.20.2
- ASTM D149
- ASTM D150
Choose a size
Selection Charts
- D (min.)
- Minimum inside diameter as supplied
- d (max.)
- Maximum inside diameter after recovery
- T
- Wall thickness after recovery (+5% / −2%)
- Reel length
- Supplied length in metres
- W+B
- Width plus thickness of a rectangular busbar the size fits
- Ø
- Diameter of a round busbar the size fits
| Gala size | D(min.) | d(max.) | T(+5% / −2%) | Reel length(m) | Rect. bar W+B min. | Rect. bar W+B max. | Round bar Ø min. | Round bar Ø max. |
|---|---|---|---|---|---|---|---|---|
| GMB 16/6 | 16 | 6 | 1.70 | 25 | 11 | 18 | 7 | 12 |
| GMB 25/10 | 25 | 10 | 2.50 | 25 | 16 | 30 | 12 | 20 |
| GMB 30/12 | 30 | 12 | 2.10 | 25 | 25 | 38 | 16 | 25 |
| GMB 40/16 | 40 | 16 | 2.10 | 25 | 33 | 50 | 21 | 32 |
| GMB 50/20 | 50 | 20 | 2.10 | 25 | 38 | 63 | 24 | 40 |
| GMB 65/25 | 65 | 25 | 2.20 | 25 | 53 | 82 | 34 | 52 |
| GMB 75/28 | 75 | 28 | 2.50 | 25 | 63 | 94 | 40 | 60 |
| GMB 85/32 | 85 | 32 | 2.50 | 25 | 69 | 107 | 44 | 68 |
| GMB 100/38 | 100 | 38 | 3.00 | 25 | 83 | 126 | 53 | 80 |
| GMB 120/45 | 120 | 45 | 3.00 | 25 | 104 | 150 | 66 | 96 |
| GMB 150/60 | 150 | 60 | 3.30 | 20 | 132 | 200 | 84 | 127 |
| GMB 180/72 | 180 | 72 | 3.00 | 20 | 151 | 226 | 96 | 144 |
| GMB 205/85 | 205 | 85 | 3.10 | 1.5 | 239 | 257 | 152 | 164 |
| GMB 250/100 | 250 | 100 | 3.10 | 1.5 | 264 | 314 | 168 | 200 |
Source: GALA BUSSLEEVE Heat Shrink Busbar Sleeve catalogue, Issue 2, August 2026.
Heavy wall BUSSLEEVE (GHB), up to 36 kV
| Gala size | D(min.) | d(max.) | T(+5% / −2%) | Reel length(m) | Rect. bar W+B min. | Rect. bar W+B max. | Round bar Ø min. | Round bar Ø max. |
|---|---|---|---|---|---|---|---|---|
| GHB 25/8 | 25 | 8 | 3.20 | 25 | 20 | 28 | 13 | 20 |
| GHB 30/12 | 30 | 12 | 3.50 | 25 | 28 | 33 | 18 | 25 |
| GHB 40/16 | 40 | 16 | 3.50 | 25 | 35 | 45 | 22 | 32 |
| GHB 50/20 | 50 | 20 | 3.50 | 25 | 45 | 54 | 29 | 40 |
| GHB 65/25 | 65 | 25 | 3.50 | 25 | 50 | 62 | 32 | 43 |
| GHB 75/28 | 75 | 28 | 3.50 | 20 | 53 | 69 | 34 | 47 |
| GHB 85/32 | 85 | 32 | 3.50 | 20 | 69 | 100 | 44 | 68 |
| GHB 100/38 | 100 | 38 | 3.70 | 20 | 83 | 102 | 53 | 72 |
| GHB 120/45 | 120 | 45 | 3.70 | 20 | 94 | 125 | 60 | 85 |
| GHB 150/60 | 150 | 60 | 3.70 | 15 | 122 | 168 | 78 | 105 |
| GHB 180/70 | 180 | 70 | 3.70 | 15 | 160 | 196 | 102 | 125 |
| GHB 205/85 | 205 | 85 | 3.70 | 1.5 | 239 | 250 | 152 | 164 |
| GHB 250/120 | 250 | 120 | 3.80 | 1.5 | 264 | 314 | 168 | 200 |
Source: GALA BUSSLEEVE Heat Shrink Busbar Sleeve catalogue, Issue 2, August 2026.
Thin wall BUSSLEEVE (GSC), up to 3.3 kV
| Gala size | D(min.) | d(max.) | T(+5% / −2%) | Reel length(m) | Rect. bar W+B min. | Rect. bar W+B max. | Round bar Ø min. | Round bar Ø max. |
|---|---|---|---|---|---|---|---|---|
| GSC 16/8 | 16 | 8 | 0.69 | 100 | 16 | 18 | 12 | 12 |
| GSC 20/10 | 20 | 10 | 0.78 | 100 | 22 | 25 | 14 | 16 |
| GSC 30/15 | 30 | 15 | 0.86 | 50 | 33 | 38 | 21 | 24 |
| GSC 40/20 | 40 | 20 | 0.96 | 50 | 44 | 52 | 28 | 33 |
| GSC 50/25 | 50 | 25 | 0.96 | 25 | 53 | 65 | 34 | 41 |
| GSC 60/30 | 60 | 30 | 0.96 | 25 | 64 | 75 | 41 | 48 |
| GSC 70/35 | 70 | 35 | 1.10 | 25 | 72 | 90 | 46 | 57 |
| GSC 80/40 | 80 | 40 | 1.27 | 25 | 86 | 100 | 55 | 64 |
| GSC 100/50 | 100 | 50 | 1.40 | 25 | 104 | 125 | 66 | 80 |
| GSC 120/60 | 120 | 60 | 1.40 | 25 | 110 | 150 | 70 | 96 |
| GSC 150/75 | 150 | 75 | 1.40 | 25 | 151 | 190 | 96 | 121 |
| GSC 180/90 | 180 | 90 | 1.50 | 25 | 179 | 236 | 114 | 150 |
Source: GALA BUSSLEEVE Heat Shrink Busbar Sleeve catalogue, Issue 2, August 2026.
Dimensions & Drawings
Bus Tube is a heat-shrinkable, non-tracking cross-linked polyolefin tube that insulates busbar systems up to 36 kV and protects against accidental flashover, meeting ANSI C37.20.2 for MV switchgear application.
Covered on this page
- Busbar Tubes - BUSTUBE
- Thin Wall Tube [Up to 3.3KV]
- Medium Wall Tube [upto 24KV]
- Heavy Wall Tube [upto 36KV]
Features & Benefits
- Meets ANSI C37.20.2 for MV switchgear application up to 36 kV
- GSC (Thin Wall, to 3.3 kV), GMB (Medium Wall, to 24 kV) and GHB (Heavy Wall, to 36 kV) series
- Dielectric strength 22 kV/mm (min., ASTM D149)
- No tracking, erosion or flame failure up to 3.25 kV for 20 min (ASTM D2303)
- Continuous temperature limit −40°C to +115°C (IEC 216)
- Halogen free, flame retardant
- Highly flexible for straight or angled bars without creasing
Applications
- Reducing busbar clearance in switchgear and bus duct design
- Insulating rectangular and round busbars against chemical corrosion (acid, alkali, salt)
- Preventing insulation faults between adjacent busbars in a bus duct
Standards & Compliance
- ANSI C37.20.2
- ASTM D149
- ASTM D150
- ASTM D257
- ASTM D570
- ASTM D638
- ASTM D792
- ASTM D2240
- ASTM D2303
- ASTM D2671
- ESI 09-11
- IEC 216
FAQs
Frequently Asked Questions
What is the Busbar Tubes used for?
It is used for:
- Reducing busbar clearance in switchgear and bus duct design
- Insulating rectangular and round busbars against chemical corrosion (acid, alkali, salt)
- Preventing insulation faults between adjacent busbars in a bus duct
How do I choose the right size?
Use the selection chart on this page: it lists every code with its dimensions, and the key above it says what each column means. If you are not sure which fits, send the dimensions you are working to with the form below.
Which standards and test methods are quoted for it?
These:
- ANSI C37.20.2
- ASTM D149
- ASTM D150
- ASTM D257
- ASTM D570
- ASTM D638
- ASTM D792
- ASTM D2240
- ASTM D2303
- ASTM D2671
Where can I download the datasheet?
From the "Download datasheet" button at the top of this page, or here:
Can I get a quote, a sample or a size that is not listed?
Send your cable details, quantity and application with the "Request a Quote or Sample" form at the foot of this page. For a size or variant that is not in the chart, describe what you need there, or use Technical support at the top of the page, and the technical team will confirm what can be supplied.
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