Heat Shrink Rain Shed — Tri-Core
The GHSG tri-core rain shed increases the surface creepage distance of a 3-core cable termination without increasing tail length, factory-fitted with hot melt adhesive.
- ASTM D638
- ASTM D792
- ASTM D2240
Choose a size
Selection Chart
- A
- Overall size of the triangular skirt, base to apex on the plan drawing (printed "ØA" on the chart)
- D
- Internal diameter of each collar
- H
- Height of the collar
- T
- Thickness
- s / f
- As supplied / after free recovery
| Gala code | A(min) | Ds(±3 mm) | Df(max) | Hs(min) | Tf(±10%) |
|---|---|---|---|---|---|
| GRST-1 | 152 | 35 | 16 | 25 | 2.8 |
| GRST-2 | 152 | 45 | 22 | 25 | 3.0 |
| GRST-3 | 152 | 50 | 22 | 25 | 3.0 |
All dimensions are in mm. Source: GALA Heat Shrink Rain Shed – Tri-core sheet, Issue 2, January 2024.
Material properties
Technical Specification
| Technical Specification | ||
|---|---|---|
| PROPERTIES | VALUE | STANDARD |
| Physical | ||
| Tensile Strength | 12 N/mm² (Mpa) (min.) | ASTM D638 |
| Ultimate Elongation | 350 % (min) | ASTM D638 |
| Density | 1.15± 0.2 g/cm³ | ASTM D792 |
| Hardness | 45 ±10 Shore D | ASTM D2240 |
| Water absorption | 0.5 % (max.) | ASTM D570 |
| Thermal | ||
| Accelerated ageing | (120 0 C for 500 hrs) | ASTM D2671 |
| Tensile Strength | 11 N/mm² (Mpa) (min.) | ASTM D638 |
| Ultimate Elongation | 300 % (min.) | ASTM D638 |
| Low Temperature Flexibility | No Cracking | ASTM D2671 |
| (-40 0 C for 4 hrs.) | ||
| Heat Shock (250 0 C for 30 min.) | No cracking or flowing | ESI 09-11 |
| Shrink Temperature | 125 0 C | IEC 216 |
| Continuous Temperature Limit | -40 to +100 0 C | IEC 216 |
| Electrical | ||
| Dielectric Strength | 15 KV/mm.(min) | ASTM D149 |
| Volume Resistivity | 1 × 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 |
Dimensions & Drawings
GHSG is the tri-core variant of Gala's rain shed, sized to fit over three termination cores at once rather than one core at a time.
Covered on this page
- Heat Shrink Rain Shed - Tri-core
Features & Benefits
- Cross-linked polyolefin with non-tracking behaviour
- Internally coated with water-resistant mastic
- Factory-applied hot melt adhesive seals to wire and cable jackets
- Suitable for indoor and outdoor applications
- Tensile strength ≥12 N/mm² (ASTM D638), density 1.15±0.2 g/cm³ (ASTM D792)
- Dielectric strength 15 kV/mm min (ASTM D149), volume resistivity 1 x 10¹⁴ ohm.cm min (ASTM D257)
- No tracking, erosion or flame failure up to 3.25 kV for 20 minutes (ASTM D2303)
- Shrink temperature 125°C, continuous temperature limit -40°C to +100°C (IEC 216)
- Three sizes: GRST-1, GRST-2 and GRST-3
Applications
- Tri-core cable termination creepage extension
- Rainy-season tracking prevention on 3-core MV terminations
Standards & Compliance
- ASTM D638
- ASTM D792
- ASTM D2240
- ASTM D570
- ASTM D2671
- ESI 09-11
- IEC 216
- ASTM D149
- ASTM D257
- ASTM D150
- ASTM D2303
FAQs
Frequently Asked Questions
What is the Heat Shrink Rain Shed used for?
It is used for:
- Tri-core cable termination creepage extension
- Rainy-season tracking prevention on 3-core MV terminations
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.
How is it installed?
Clean and degrease the surface, position the part, then shrink it with a gas torch or a hot-air gun: keep the heat moving round it with a smooth, brushing motion so it recovers evenly without scorching. The instruction sheet in each kit gives the full sequence step by step, including where to start shrinking.
Which standards and test methods are quoted for it?
These, with the values in the Technical Specification on this page:
- ASTM D638
- ASTM D792
- ASTM D2240
- ASTM D570
- ASTM D2671
- ESI 09-11
- IEC 216
- ASTM D149
- ASTM D257
- ASTM D150
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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