RIKI heat shrink busbar insulation tubing is supplied in continuous lengths for 10kV and 35kV busbar insulation applications in switchgear, substations and power distribution equipment. The catalog lists separate MPG10 and MPG35 size ranges, with red, yellow and green options, a published breakdown strength of at least 25 kV/mm and a complete shrink temperature of 120–140°C. Before selecting a roll, buyers should check the busbar profile, required expanded and recovered tube dimensions, finished insulation thickness and the equipment’s electrical clearance requirements.
A copper busbar may be specified as 80 mm wide, but that measurement alone does not determine the correct heat shrink sleeve. The bar thickness, joint geometry, bends and components that the tubing must pass over can all affect installation.
RIKI’s continuous busbar tubing is available in two voltage families: MPG10 for 10kV applications and MPG35 for 35kV applications. The catalog provides separate tables showing applicable busbar width, tubing inside diameter before and after shrinkage, and wall thickness at both stages.
These dimensions should be considered together. Choosing a sleeve only because its listed busbar width matches a drawing can produce problems when the actual copper profile or connection hardware is larger than the intended tubing opening.
Consider the 50/25 designation. Both MPG10 and MPG35 have a nominal size option with that designation, but their insulation wall thicknesses differ.
The 35kV version therefore cannot be treated as the same tubing with a different label. This distinction should appear in the purchasing specification, particularly when two voltage classes are ordered for the same factory or project.
The catalog also lists fewer nominal sizes in the 35kV range. MPG10 has twelve options, while MPG35 has eleven. A 10kV ordering code should not be assumed to have an identically numbered 35kV replacement.
The tubing is supplied in an expanded state and contracts when heated according to the applicable procedure. RIKI publishes a radial shrinkage value greater than 50% and a longitudinal shrinkage figure below 5% for the continuous busbar tube family.
The recovered tube must form the intended insulation covering around the busbar profile. Its installed dimensions are affected by the actual busbar geometry, not solely by the nominal free-recovery dimensions in the catalog.
RIKI lists 120–140°C as the complete shrink temperature range. This is a material recovery reference, not a universal hot-air gun setting or permission to expose nearby electrical equipment to the same temperature.
During installation, the bar must be prepared and the required insulating length established. Heating should follow the manufacturer’s instructions, with particular attention to corners, bends and changes in cross-section. The catalog does not specify one heating duration that applies to every tubing size.
The product is shown in red, yellow and green continuous rolls. These are catalog color options, and the buyer should state the required colors when ordering.
Color selection should follow the relevant project’s busbar identification requirements. Neither the photograph nor the color alone identifies a 10kV or 35kV product, and the same color should not be used as evidence that two tubes have identical electrical properties.
For an order involving multiple phases, confirm the required colors, quantities and installed identification method against the applicable equipment specification.
The catalog describes busbar heat shrink tubing as protection against accidental contact, foreign objects and conditions associated with contamination or moisture. Such coverings can reduce exposure of conductive surfaces, but they are not a substitute for a properly designed insulating system.
RIKI publishes a material breakdown strength of at least 25 kV/mm. That is a material test value. It is not proof that any length of covered busbar will withstand a particular system test voltage once installed inside a switchgear cabinet.
Required phase-to-phase and phase-to-earth clearances must be established from the equipment design, applicable standards and qualification evidence. The use of insulation sleeves should not be taken as permission to reduce those distances by an assumed amount.
Bolted connections, terminals and irregular junctions may also need a different insulating component or an approved supplementary treatment. A straight continuous tube cannot be assumed to fit every connection shape.
For a new switchgear project, the most useful document is a busbar layout drawing showing widths, thicknesses, bends, joint locations and required covered lengths. A flat bar and a formed busbar with the same nominal width may not have the same tubing installation requirements.
Specify the voltage family, MPG ordering code, color and required roll or cut length. Check whether the tubing must pass over joints or hardware before shrinking, and obtain dimensional approval if the geometry differs from a straight bar.
The catalog publishes the continuous tubing range but does not establish a standard roll length for every SKU. Packaging lengths and any project-specific tests should therefore be confirmed with the quotation rather than inferred from the product image.
| Product Name | 10kV / 35kV Heat Shrink Busbar Insulation Tubing |
|---|---|
| Brand | RIKI |
| Manufacturer | Zhejiang Ruikai Electric |
| Product Category | Tubing & Busbar Insulation |
| Product Type | Continuous Heat Shrinkable Busbar Insulation Sleeve |
| Voltage Series | 10kV (MPG10) / 35kV (MPG35) |
| Available Colors | Red, Yellow, Green |
| Radial Shrinkage | >50% (Catalog Value) |
| Longitudinal Shrinkage | <5% (Catalog Value) |
| Complete Shrink Temperature | 120–140°C |
| Published Usage Temperature Range | -55°C to +125°C |
| Breakdown Strength | ≥25 kV/mm |
| Volume Resistivity | >1014 Ω·cm |
| Tensile Strength | >12 MPa |
| Elongation at Break | >400% |
| Hardness | <80 Shore A |
| Flame Retardancy — Oxygen Index | >30 |
| Standard Roll Length | Not Published; Confirm for Order |
| Model | Busbar Width (mm) | Tube ID Before / After Shrink (mm) | Wall Before / After Shrink (mm) |
|---|---|---|---|
| MPG10-20/10 | 15–20 | >20 / ≤10 | 1.1±0.3 / 2.1±0.1 |
| MPG10-25/12.5 | 20–30 | >25 / ≤12.5 | 1.1±0.3 / 2.1±0.1 |
| MPG10-30/15 | 30–40 | >30 / ≤15 | 1.1±0.3 / 2.1±0.1 |
| MPG10-40/20 | 40–50 | >40 / ≤20 | 1.1±0.3 / 2.1±0.1 |
| MPG10-50/25 | 50–60 | >50 / ≤25 | 1.1±0.3 / 2.2±0.1 |
| MPG10-65/32.5 | 60–70 | 65±2 / ≤32.5 | 1.1±0.3 / 2.2±0.1 |
| MPG10-75/37.5 | 80–90 | 75±2 / ≤37.5 | 1.1±0.3 / 2.2±0.1 |
| MPG10-85/42.5 | 90–100 | 85±2 / ≤42.5 | 1.2±0.3 / 2.3±0.1 |
| MPG10-100/50 | 120 | 100±3 / ≤50 | 1.2±0.3 / 2.4±0.1 |
| MPG10-120/60 | 140 | 120±3 / ≤60 | 1.2±0.3 / 2.4±0.1 |
| MPG10-150/75 | 180 | 150±5 / ≤75 | 1.2±0.3 / 2.5±0.1 |
| MPG10-200/100 | 200 | 200±5 / ≤100 | 1.2±0.3 / 2.5±0.1 |
| Model | Busbar Width (mm) | Tube ID Before / After Shrink (mm) | Wall Before / After Shrink (mm) |
|---|---|---|---|
| MPG35-25/12.5 | 20–30 | >25 / ≤12.5 | 1.5±0.5 / 2.9±0.1 |
| MPG35-30/15 | 30–40 | >30 / ≤15 | 1.5±0.5 / 2.9±0.1 |
| MPG35-40/20 | 40–50 | >40 / ≤20 | 1.5±0.5 / 3.0±0.1 |
| MPG35-50/25 | 50–60 | >50 / ≤25 | 1.5±0.5 / 3.1±0.1 |
| MPG35-65/32.5 | 60–70 | 65±2 / ≤32.5 | 1.6±0.5 / 3.2±0.2 |
| MPG35-75/37.5 | 80–90 | 75±2 / ≤37.5 | 1.6±0.5 / 3.2±0.2 |
| MPG35-85/42.5 | 90–100 | 85±2 / ≤42.5 | 1.6±0.5 / 3.3±0.2 |
| MPG35-100/50 | 120 | 100±3 / ≤50 | 1.7±0.5 / 3.3±0.2 |
| MPG35-120/60 | 140 | 120±3 / ≤60 | 1.7±0.5 / 3.4±0.2 |
| MPG35-150/75 | 180 | 150±5 / ≤75 | 1.8±0.5 / 3.5±0.2 |
| MPG35-200/100 | 200 | 200±5 / ≤100 | 1.8±0.5 / 3.5±0.2 |
Select the voltage series required by the equipment design first. MPG10 and MPG35 have separate catalog size tables and different published insulation wall thicknesses, even where their nominal dimensions look similar. The final choice must also account for the busbar profile, installed insulation dimensions and applicable equipment tests. Color alone does not identify the voltage series.
Not from the width entry alone. The catalog associates this model with an 80–90 mm busbar width while listing a nominal expanded inside diameter of 75±2 mm. The complete bar cross-section, tubing profile and installation method need to be checked to establish fit. Request dimensional confirmation rather than assuming that the published width is a universal slip-on clearance.
No. The catalog value describes the tubing material’s electrical breakdown strength under test conditions. It does not define the rated voltage of a completed busbar assembly or establish the allowable phase clearances. The selected 10kV or 35kV tubing must be assessed as part of the intended equipment insulation system and its applicable qualification requirements.
Not automatically. Continuous tubing is suited to covering compatible busbar sections, but bolted joints, branches and irregular connections can have different shapes and insulation requirements. The complete connection geometry should be reviewed before deciding whether continuous tubing, a joint cover or another approved insulation arrangement is necessary. Do not leave a conductive joint exposed solely because adjacent straight sections are covered.
The catalog confirms all three colors but does not publish a standard roll length for each ordering code. Specify the voltage series, exact MPG size, color and required length when requesting a quotation. The supplier should confirm the available roll or cut lengths, packaging unit and quantity before the purchase order is finalized.
Applying continuous insulation tubing to suitable copper or aluminum busbar sections during equipment fabrication, according to the approved insulation design.
Selection check: Bar profile, tubing size and finished wall thickness
Insulating designated busbar runs in substation distribution equipment where the required voltage series and electrical clearances have been established.
Selection check: 10kV or 35kV series and qualified assembly design
Replacing damaged or aged insulation on suitable busbar sections, subject to equipment isolation, material compatibility and the approved refurbishment procedure.
Selection check: Existing insulation arrangement and installation access
Supplying multiple MPG sizes and colors for busbar production schedules, with quantities determined by the layout, required covered lengths and material allowances.
Selection check: SKU, color, length and packaging unit
