What Are RG7H1R and RG7OZR Cables?
RG7H1R and RG7OZR are medium voltage EPR-insulated power cables used for MV power distribution, airport lighting systems, and industrial applications. The designation follows IEC standards: R indicates EPR insulation, G indicates glands/connector compatible, 7 indicates rated voltage, H1 indicates type of construction, and R/OZR indicates sheath/armour variants. RG7H1R is unarmoured (copper wire screen only), while RG7OZR is steel wire armoured for direct burial and mechanical protection.
TEBAOFLEX manufactures both types to IEC 60502-2. View our RG7H1R airport lighting cable, RG7H1OR MV power cable, and RG7OZR armoured MV cable product pages for specifications.
RG7H1R Cable Construction (Unarmoured)
Conductor
- Material: Stranded copper (Class 2 per IEC 60228)
- Sizes: 25mm² to 400mm²
- Material option: Aluminum available for lighter weight
Conductor Screen
- Material: Semiconducting cross-linked compound (extruded)
- Function: Provides smooth electrical interface between conductor and insulation, eliminates field enhancement at strand surfaces
Insulation
- Material: EPR (ethylene propylene rubber)
- Rating: 3.6/6kV, 6/10kV, 8.7/15kV, 12/20kV
- Temperature: 90°C continuous conductor temperature
- Thickness: Per IEC 60502-2 based on voltage rating
Insulation Screen
- Material: Semiconducting cross-linked compound (extruded, strippable)
- Function: Provides smooth interface between insulation and metallic screen
Metallic Screen
- Material: Copper wire screen or copper tape
- Coverage: Minimum 90% coverage for short circuit current carrying capacity
- Function: Earth fault current path, electromagnetic shielding
Outer Sheath
- Material: PVC (polyvinyl chloride) type ST2
- Color: Black or red
- Properties: UV resistant, flame retardant
RG7OZR Cable Construction (Armoured)
RG7OZR has the same core construction as RG7H1R, plus additional armour layer:
Bedding (Inner Sheath)
- Material: PVC or LSZH compound
- Function: Separation between metallic screen and armour, provides bedding for armour wires
Armour
- Material: Galvanized steel wire armour (SWA) or steel tape armour (STA)
- Function: Mechanical protection for direct burial, impact resistance, rodent protection
- Single-core cables: Aluminum wire armour (AWA) to prevent magnetic losses
Outer Sheath
- Material: PVC type ST2 or LSZH
- Properties: UV resistant, flame retardant, abrasion resistant
Technical Specifications
| Parameter | RG7H1R (Unarmoured) | RG7OZR (Armoured) |
|---|---|---|
| Standard | IEC 60502-2 | IEC 60502-2 |
| Voltage Rating | 3.6/6kV, 6/10kV, 8.7/15kV, 12/20kV | 3.6/6kV, 6/10kV, 8.7/15kV, 12/20kV |
| Conductor | Copper Class 2 (or Al) | Copper Class 2 (or Al) |
| Conductor Screen | Semiconducting XLPE | Semiconducting XLPE |
| Insulation | EPR | EPR |
| Insulation Screen | Semiconducting (strippable) | Semiconducting (strippable) |
| Metallic Screen | Copper wire/tape | Copper wire/tape |
| Armour | None | SWA (steel wire) or AWA |
| Outer Sheath | PVC ST2 | PVC ST2 or LSZH |
| Max Conductor Temp | 90°C | 90°C |
| Min Operating Temp | -20°C | -20°C |
| Min Bending Radius | 12× OD (single), 15× OD (3-core) | 12× OD (single), 15× OD (3-core) |
| Installation | Tray, indoor, conduit | Direct burial, duct, outdoor |
Available Configurations
| Voltage | Cores | Conductor Size | Approx. OD (mm) RG7H1R | Approx. OD (mm) RG7OZR |
|---|---|---|---|---|
| 3.6/6kV | 1C | 25-400mm² | 18-35 | 22-40 |
| 3.6/6kV | 3C | 25-240mm² | 35-70 | 40-78 |
| 6/10kV | 1C | 25-400mm² | 20-38 | 24-44 |
| 6/10kV | 3C | 25-185mm² | 40-75 | 46-84 |
| 8.7/15kV | 1C | 35-400mm² | 24-42 | 28-48 |
| 8.7/15kV | 3C | 35-150mm² | 48-80 | 54-90 |
| 12/20kV | 1C | 50-400mm² | 28-46 | 32-52 |
| 12/20kV | 3C | 50-120mm² | 55-85 | 62-95 |
Note: Values are approximate. Contact TEBAOFLEX for detailed datasheets.
Standards and Certifications
- IEC 60502-2: Power cables with extruded insulation for rated voltages from 6kV to 30kV
- IEC 60228: Conductor standards
- IEC 60840: Power cables with extruded insulation from 30kV up to 150kV (for higher voltage variants)
- Partial discharge test: Per IEC 60502-2 (≤5 pC at 1.73× U0)
- Impulse voltage test: BIL per IEC 60502-2
- Heat cycle test: Type test per IEC 60502-2
Selection Guide
- Determine voltage: 3.6/6kV, 6/10kV, 8.7/15kV, or 12/20kV per system requirements
- Assess installation environment: Indoor tray → RG7H1R; Direct burial → RG7OZR
- Calculate current: Full-load current with derating for soil temperature and grouping
- Choose core count: 1C (single-phase or 3-phase with 3 cables), 3C (3-phase in one cable)
- Verify short circuit: Copper wire screen must carry earth fault current
- Consider LSZH: For enclosed spaces, public buildings, and tunnels
Why Choose TEBAOFLEX for RG7H1R / RG7OZR Cable?
- IEC 60502-2 compliant manufacturing with full type test support
- EPR insulation rated 90°C with excellent electrical and thermal properties
- Copper wire screen with minimum 90% coverage for fault current capacity
- Available in both unarmoured (RG7H1R) and armoured (RG7OZR) versions
- Wide voltage range: 3.6/6kV to 12/20kV
- Single-core and 3-core configurations, 25mm² to 400mm²
- PVC and LSZH sheath options
- Factory-direct competitive pricing — 30-50% lower than European brands
Browse our medium voltage cable products or request a quotation for your RG7H1R / RG7OZR cable requirements.
