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3M 7622PST-G2 15kV 3-Core Cold Shrink Indoor Termination (Cable Terminal)
- Model Segment Interpretation
| Segment | Meaning | Remarks |
| 7622 | Product series code | 3M QTIII 3rd generation cold shrink technology, 8.7/15kV 3-core indoor termination series |
| PST | Structural type code | Pre-expanded Silicone Termination, integrated stress control design |
| G2 | Specification adaptation code | Suitable for 3×70~3×120 mm² cable conductor, insulation outer diameter 16.0~28.0 mm |
| Implied Parameter | Voltage level / Installation environment | 8.7/15kV (15kV system), indoor type (without rain shed), QTIII 3rd generation technology |
- Core Specification Parameters
Electrical Parameters
| Parameter | Value | Description |
| Rated Voltage | 8.7/15 kV (Max 20 kV) | Suitable for medium voltage power system, compliant with IEC 60502 standard |
| Maximum System Voltage | 17.5 kV | Meets Class 1 termination requirements of IEEE 48-1990 standard |
| Applicable Cable Type | Wire shield / Tape shield XLPE/EPR insulated power cable | Dedicated for polymer insulated cables; not applicable to oil-impregnated paper insulated cables |
| Insulation Outer Diameter Range | 16.0–28.0 mm | Typical insulation outer diameter for 3×70 mm² cable (approx. 18–22 mm) |
| Power Frequency Withstand Voltage | 45 kV / 1 min | Factory test standard to ensure insulation reliability |
| Partial Discharge | ≤5 pC | QTIII 3rd generation technology, better performance than QTII series (≤10 pC) |
| Switch Impulse Withstand Voltage | 95 kV | Satisfies system overvoltage protection requirements |
Mechanical & Environmental Parameters
| Parameter | Value | Description |
| Insulation Material | High dielectric constant creepage-resistant silicone rubber | Permanent radial pressure, excellent weather resistance and aging resistance |
| Ingress Protection | IP68 | Fully dustproof and waterproof, suitable for humid indoor environments |
| Operating Temperature | -40℃ ~ +90℃ | Wide temperature range, adapts to extreme climatic conditions |
| Mechanical Service Life | ≥30 years | Maintenance-free design with long service life |
| Installation Method | Cold shrink type (no heating tools required) | Automatically shrinks by pulling out the support core rope for easy installation |
| Weight | Approx. 0.8 kg/set | Complete with all components, convenient for on-site installation |
| Color | Black | Standard industrial color, stain-resistant |
Applicable Cable Parameters
| Parameter | Application Range | Remarks |
| Conductor Cross-section | 3×70–120 mm² | Suitable for mainstream medium voltage distribution cable cross-sections |
| Conductor Material | Copper / Aluminum | Compatible with two mainstream conductor materials, no special model required |
| Insulation Thickness | 8–12 mm | Standard insulation thickness for 15kV cables |
| Shield Type | Braided copper wire shield / Wrapped copper tape shield | Compatible with two common shielding structures |
| Overall Cable Outer Diameter | 35–50 mm | Typical outer diameter range for 3-core cables |
- Accessory List
| Accessory Name | Quantity | Purpose |
| QTIII Cold Shrink Termination Body (with integrated stress control) | 3 pcs | Provide insulation and stress control, grease-free design |
| Cold Shrink Branch Seal Sleeve | 1 pc | Seal cable branch to prevent moisture ingress |
| Constant Force Spring Grounding Device | 3 pcs | Shield layer grounding connection, no welding or copper binding wire required |
| Copper Mesh Grounding Wire | 3 pcs | Shield layer grounding connection to ensure reliable grounding |
| Phase Color Marker (Yellow/Green/Red) | 3 sets | Phase identification, compliant with power safety regulations |
| Cleaning Kit (CC-2) | 1 set | Pre-clean cable surface to remove oil stains and impurities |
| Sealing Strip | 6 pcs | Seal termination top and cable branch to enhance waterproof performance |
| Installation Instruction Manual | 1 copy | Detailed illustrated installation guidance |
| Support Core Rope Pulling Tool | 1 pc | Assist steady rope pulling during installation to avoid termination distortion |
- Competitor & Cross-Brand Comparison
| Brand | Model | Main Difference | Application Scenario |
| Original 3M | 7622-S-4 | Outdoor type with rain shed, 15kV, 3×70–120 mm² | Outdoor medium voltage distribution equipment connection |
| Original 3M | 5601PST-G-CN | QTII 2nd generation, 15kV, 3×35–70 mm² | Indoor power distribution, budget-limited projects |
| ABB | Cold Shrink Termination Series | Similar structure, slightly higher price, same applicable range | Power system supporting, brand preference |
| Schneider | Cold Shrink Termination Series | Different stress control design, slight difference in installation steps | Industrial automation system supporting |
| Domestic Alternative | Changyuan CYLS-15/3.1 | Price about 1/2–2/3 of 3M, performance meets national standards | Budget-sensitive projects, non-critical circuits |
| Domestic Alternative | Walen WRS-15/3.1 | High cost performance, same applicable range | General distribution projects, bulk procurement |
- Selection Guidelines & Replacement Solutions
5.1 Key Selection Parameters
Voltage Level Matching: Confirm system voltage is 8.7/15kV; not applicable for systems below 10kV or above 20kV.
Cable Specification Confirmation:
Conductor cross-section: Well compatible within 3×70–120 mm² range.
Insulation outer diameter: Must be within 16.0–28.0 mm with tolerance ≤±1mm, ensuring sufficient radial compression of cold shrink termination.
Shield type: Only applicable to wire/tape shielded cables; not for non-shielded or aluminum sheathed cables.
Installation Environment:
Indoor application: Select 7622PST-G2 (indoor type), compact structure without rain shed.
Outdoor application: Choose outdoor type 7622-S-4 with UV resistance and weatherability.
Installation Tools: No heating tools required; only basic electrician tools and cleaning supplies, single-person installation available.
5.2 Recommended Replacement Solutions
| Application Scenario | Recommended Replacement Model | Advantages |
| Direct replacement with same specification | 3M 7622PST-G2 (3×70–120 mm² applicable) | Original genuine product, fully compatible, QTIII 3rd generation technology |
| Small cross-section adaptation | 3M 7620PST-G1 (3×35–70 mm² applicable) | Fits smaller cross-section cables with lower cost |
| Large cross-section upgrade | 3M 7624PST-G1 (3×150–240 mm² applicable) | Compatible with larger cross-section cables, reserved for future capacity expansion |
| Outdoor installation | 3M 7622-S-4 | Dedicated outdoor type with rain shed, excellent UV resistance |
| Cost optimization | Changyuan CYLS-15/3.1 | High-quality domestic alternative, obvious price advantage, performance meets national standards |
5.3 Installation Precautions
- Cable Pre-treatment
Thoroughly clean cable surface with 3M CC-2 cleaning kit to remove oil stains and oxide layer.
Keep smooth transition at shield cut-off position to avoid tip discharge; professional tools are recommended.
- Installation Procedure
QTIII series: Integrated design without additional stress control mastic required; install branch seal sleeve first, then cold shrink termination body.
Pull the core rope steadily at constant speed to avoid termination distortion and ensure close fitting with cable surface.
- Safety Regulations
Installers must hold valid medium voltage cable construction qualification; confirm cable power off and grounding before construction.
Construction site shall be dry and clean; avoid installation in rainy or humid conditions.
- Quality Control
Perform insulation resistance test (≥1000 MΩ) and partial discharge test (≤5 pC) after installation.
Record installation date and test data for future maintenance and traceability.
- Product Features Summary
- QTIII 3rd Generation Technology: Grease-free application, lower partial discharge (≤5 pC), easier installation and higher reliability.
- Integrated Design: Built-in stress control unit effectively reduces partial discharge risk and improves insulation reliability.
- Easy Installation: Cold shrink technology requires no heating tools; single-person installation saves construction time and cost.
- Strong Environmental Adaptability: Operating temperature -40℃~+90℃, IP68 protection grade, suitable for various harsh indoor environments.
- Wide Compatibility: Compatible with multiple specifications of XLPE/EPR insulated cables with high versatility, reducing inventory pressure.
- Maintenance-free Design: Silicone rubber provides permanent radial pressure without regular inspection, lowering operation and maintenance costs.
