Busbar Insulation and Covers
S1(n)-35 Halogen Free Busbar Insulation Heat Shrink Tube 6 to 36 kV
The 36 kV halogen free busbar grade for switchgear where clearance is tight and smoke toxicity is regulated
- Operating temperature: -40 to 105°C
- Minimum full recovery temperature: 125°C
- Voltage class: 6kV to 36kV
- Halogen-free, RoHS compliant
- Shrink ratio: 2:1 & 2.5:1
- Standard Color: Red
S1(n)-35 · Busbar Insulation and Covers
Product Overview
What S1(n)-35 Does
Halogen-free and environmentally friendly polyolefin material, can be applied in 6kV to 36kV power switchgear, providing insulation enhancement, protection against flashover or accidental discharge. Especially suitable for switchgear with limited space, it can be used for circular and rectangular copper or aluminum busbars.
The 36 kV halogen free busbar grade for switchgear where clearance is tight and smoke toxicity is regulated It is manufactured by Dalian United Polymer Material Co., Ltd. in Dalian China where radiation cross linking extrusion and molding are all performed in house under one quality system.
Key Benefits
- Insulation enhancement rated for the full 6 to 36 kV range
- Halogen free and RoHS compliant for critical and occupied buildings
- Suits round and rectangular copper and aluminium bar
- 2:1 and 2.5:1 ratios for a wide bar section range
- Especially suited to switchgear where internal space is limited
Who It Is For
Who Benefits Most from S1(n)-35
The buyers and site teams this product was designed around
36 kV Switchgear Manufacturers
At 36 kV internal clearances dominate cubicle size and insulated busbar is what makes a compact design possible.
Renewable Substation Builders
Collector substations at 33 or 35 kV built to a small footprint.
Data Centre and Critical Facility Operators
36 kV incomers where halogen free is a building requirement.
Industrial Plant Electrical Departments
35 kV distribution switchgear inside process buildings.
Problems It Solves
Problems This Product Removes
Every one of these is a failure mode we have seen on real networks
36 kV Air Clearance Requirements Make Cubicles Large
Insulating the busbar raises withstand so the physical design can stay compact.
Higher Voltage Means Less Tolerance for Pollution
A dust film on bare 36 kV bar is a genuine flashover risk. An insulated surface is far more tolerant.
Animal Ingress Faults Are Catastrophic at 36 kV
Insulated bar removes the bridging path entirely.
Halogen Release Inside a Building Is Unacceptable
The halogen free formulation is required in occupied and critical facilities.
Application Scenarios
Where It Is Used
36 kV Switchgear Main Busbar
Insulating the main bar in a compact 36 kV cubicle.
Collector Substation Switchgear
33 and 35 kV renewable collector switchboards.
Transformer to Switchgear Bar
Insulating the connection bar in a tight cable box.
Generator Connection Bars
Insulating bar between generator and MV switchgear.
Switchgear Refurbishment
Reinsulating during a 36 kV switchboard overhaul.
Technical Data
Specifications and Dimensions
Test methods and requirements taken directly from the manufacturing specification
Technical Data
| Property | Test Method | Requirement |
|---|---|---|
| Specific gravity | ASTM D2671 | 1.0-1.2 |
| Thermal endurance | IEC 216 | 105°C minimum |
| Tensile Strength | ASTM D2671 | ≥14 MPa |
| Ultimate Elongation | ASTM D2671 | ≥400% |
| Heat Aging (136°C/168h) Tensile Strength Ultimate Elongation | ASTM D2671 | ≥12 MPa ≥300% |
| Long-term Heat Aging (100°C/3000h) Ultimate Elongation | IEC 60684-2 | ≥175% |
| Fluid resistance (23°C/168h) Tensile Strength Ultimate Elongation | IEC 60684-2 | ≥8 MPa ≥250% |
| Water absorption (23°C/24h) | ASTM D2671 | ≤1.0% |
| Low-temperature flexibility (-40°C/4h) | ASTM D2671 | No cracking |
| Heat shock (200°C/4h) | ASTM D2671 | No cracking, dripping or flowing |
| Dielectric strength | ASTM D2671 | ≥16 kV/mm |
| Volume resistivity | ASTM D2671 | ≥1.0×1013Ω·cm |
| Tracking and erosion resistance | ASTM D2303 | After 1hr at 2.5kV, and 1hr at 2.75kV, No burn penetration, no sustained burning |
| Color fastness to light | IEC 60684-3-283 | Color stability, no change |
| Copper corrosion (150°C/168h) | IEC 60684-3-283 | No corrosion |
Dimensions
| Size S1(n)-35 | As supplied (mm) Inner diameter D (min.) | After recovered (mm) Inner diameter d (max.) | Wall thickness t (nom.) | Standard length (m) |
|---|---|---|---|---|
| 25/10 | 25 | 10 | 3.5 | 15 |
| 30/12 | 30 | 12 | 3.6 | 15 |
| 40/16 | 40 | 16 | 3.6 | 15 |
| 50/20 | 50 | 20 | 3.6 | 15 |
| 65/25 | 65 | 25 | 3.6 | 15 |
| 75/30 | 75 | 30 | 3.7 | 15 |
| 85/35 | 85 | 35 | 3.7 | 15 |
| 100/40 | 100 | 40 | 3.7 | 15 |
| 120/50 | 120 | 50 | 3.8 | 15 |
| 150/60 | 150 | 60 | 3.8 | 15 |
| 175/75 | 175 | 75 | 3.8 | 15 |
| Products Slection | ||||
| Bus Bar Size (mm) | Single Layer Bus Bar | Double Layer Bus Bar | ||
| 20×3, 25×3 | Φ25/10 | Φ30/12 | ||
| 30×3, 30×4 | Φ30/12 | Φ40/16 | ||
| 30×10, 40×4 | Φ40/16 | Φ50/20 | ||
| 40×10, 50×5, 50×6 | Φ50/20 | Φ65/25 (Φ75/30) | ||
| 50×8, 50×10, 60×6, 60×8 | Φ65/25 (Φ75/30) | Φ75/30(Φ85/35) | ||
| 60×10, 80×6, 80×8, 80×10 | Φ75/30(Φ85/35) | Φ100/40(Φ120/50) | ||
| 100×8, 100×10, 100×12 | Φ100/40(Φ120/50) | Φ120/50 | ||
| 150×12, 150×15 | Φ150/60 | Φ175/75 |
CROSS REFERENCE · Tyco-Raychem: BBIT
Manufacturing and Quality
How It Is Made and Checked
Compounding extrusion radiation cross linking expansion and test all under one roof in Dalian
-
01
Compounding
Base polyolefin antioxidants flame retardants and functional fillers are mixed to a recipe held under our own formulation control rather than bought as a masterbatch.
-
02
Extrusion
The compound is extruded to the required wall and diameter. Co extruded products form two or three layers in a single pass so no interface can trap air.
-
03
Radiation Cross Linking
Electron beam irradiation creates the cross linked network that gives the material its shape memory. This step is what makes the product heat shrinkable.
-
04
Expansion
The cross linked part is heated expanded to its supplied diameter and cooled under tension so the expanded shape is locked in until heat is applied again.
-
05
Test and Inspection
More than 90 percent of product performance tests are carried out in our own laboratory including tensile elongation heat aging dielectric strength and tracking resistance.
-
06
Packing and Traceability
Each batch carries a production record so a delivered part can be traced back to its compound lot and process parameters.
Certification
ISO 9001:2015
Quality management system
IATF 16949:2016
Automotive quality management
ISO 14001:2015
Environmental management
ISO 45001:2018
Occupational health and safety
GJB 9001C-2017
Defence quality management
UL 224 E341796
Extruded insulating tubing
CE / RoHS
European conformity and restricted substances
CCS / ABS / DNV
Marine classification society approvals
Comparison
How S1(n)-35 Compares
An honest comparison so you can rule this product in or out quickly
| Product | Voltage Class | Fire Behaviour | Colour Options |
|---|---|---|---|
| S1(n)-10 | 6 to 24 kV | Halogen free | Red |
| S1(n)-35 | 6 to 36 kV | Halogen free | Red |
| S1-10 | 6 to 24 kV | Flame retardant | Red yellow green blue |
| S1-35 | 6 to 36 kV | Flame retardant | Red yellow green blue |
Use Guide
How to Select and Install S1(n)-35
The sequence our engineers walk customers through on every first installation
-
01
Confirm the Voltage Class
Use S1(n)-35 from 6 to 36 kV. Below 24 kV S1(n)-10 is the economic choice.
-
02
Measure the Bar Diagonal and Perimeter
The tube must clear the diagonal and recover onto the perimeter.
-
03
Deburr Every Edge
Sharp corners cut a recovering tube. Break all edges first.
-
04
Degrease the Bar
Machining oil and oxide prevent the tube sitting cleanly on the metal.
-
05
Shrink from the Middle
Work outward to both ends so trapped air escapes.
-
06
Cover Joints with Molded Covers
Use S1-B lap joint covers on bolted connections.
FAQ
S1(n)-35 Frequently Asked Questions
The questions buyers ask before they place an order
Why is there a separate 36 kV grade
Is it available in phase colours
Can it be applied to bar that is already installed
Does it work on aluminium bar
What is the low temperature rating
Do you supply cut lengths
Still need an answer ask our engineers on WhatsApp
Related
Related Products
S1(n)-10 Busbar HF 24 kV
Halogen free red tubing that insulates round and rectangular copper or aluminium busbar inside 6 to 24 kV switchgear
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S1-35 Busbar FR 36 kV
The 36 kV flame retardant busbar grade in four phase colours for compact switchgear and collector substations
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S1-B Lap Joint Cover
Molded clip open covers that insulate bolted busbar joints and still allow inspection without damaging the connection
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S1-A Overhead Line Cover
A wrap around insulating cover with a built in creepage device that clips onto a live route conductor without disconnection
VIEW DETAILSGet a Quotation for S1(n)-35
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