Fire Resistant 35kv MV Cable NH-VV 1.5mm2 To 1000mm2 Medium Voltage Wire

Many buyers specify NH-VV for fire-resistant power cables. If your Bill of Quantities (BOQ) requires 6/35kV medium voltage applications, we can meet the voltage rating, construction, and acceptance criteria required for critical medium voltage feeders, ensuring circuit integrity and enhanced emergency performance.

In many markets, the "VV" designation is most commonly used for low-voltage PVC insulated/PVC sheathed cables. 6/35kV medium voltage projects typically use medium voltage rated constructions (usually XLPE insulation), but may still require "NH" fire-resistant performance. If your tender or consultation specification uses the label "NH-VV 6/35kV," treat it as the procurement name and confirm the required medium voltage rating, insulation system, fire resistance acceptance, and testing methods. We will quote and manufacture according to agreed standards and data sheets to ensure smooth inspection and commissioning.

In emergency situations, the power grid must remain operational, making cable selection crucial for risk control. NH-VV cables are suitable for 6/35kV projects, particularly for critical medium-voltage feeders in substations, industrial plants, and important facilities where fire resistance, line reliability, and documentation completeness are as important as power capacity.

NH:

Fire resistance requirement, typically used to maintain circuit integrity under fire conditions; specific requirements are determined by your acceptance criteria.

VV:

PVC insulation + PVC sheath, used in many specifications (even though medium-voltage insulation systems are defined separately, some bills of quantities use this designation).

For medium-voltage applications, the key is the voltage rating and insulation/sheath system specified in the project documentation. We supply according to agreed specifications, ensuring that delivered cables meet the required performance, markings, and test documentation.

Selection depends on your system voltage, grounding method, and project standards.

• Substation to Critical Load Feeders (Factory, Data Center, Public Infrastructure)
• Medium Voltage Distribution in Industrial Areas, Especially Suitable for Areas with High Downtime Risk
• Critical Service Power Supply Lines with Fire Safety Requirements
• Tunnels, Transportation Hubs, Underground Passages, and Shared Utility Corridors (if specified)
• Power Supply for Critical Process Lines, Emergency Power Generation Integration, and Critical Medium Voltage Switchboards

Due to the mandatory compliance of 6/35kV medium-voltage cable installation with relevant standards, a typical medium-voltage fire-resistant cable is defined by the following components:

• Conductor: Copper or aluminum (copper is used for most critical medium-voltage feeders when compact cabling and reliability are prioritized)
• Conductor Shielding: Semi-conductive layer (medium-voltage requirement)
• Insulation: Medium-voltage grade insulation system (cross-linked polyethylene (XLPE) is typically used for medium-voltage applications; polyvinyl chloride (PVC) insulation is less common in medium-voltage applications and must comply with relevant standards)
• Insulation Shielding: Semi-conductive layer (medium-voltage requirement)
• Metallic Shielding: Copper tape or copper wire shielding (used for medium-voltage field control and fault current return paths)
• Inner Sheath/Padding: Protective layer under armor (if armored)
• Armor Options: Steel tape armor (STA) or steel wire armor (SWA), depending on cabling risks
• Outer Sheath: PVC or low-smoke halogen-free (LSZH), specific materials and testing methods are subject to specifications.
• Fire-resistant components: Defined by your standards (materials and testing methods)

• Conductor stranding and compaction

  Designed to meet the resistance, flexibility, and diameter control requirements of medium voltage terminations.

• Three-layer extruded shielding and insulation

  The coating of the medium voltage layers (conductor shielding, insulation, and insulating shielding) is subject to strict cleanliness and thickness control to ensure good partial discharge performance.

• Metallic shielding application

  Using copper strip or copper wire for electric field control and fault current carrying capacity.

• Sheath and armor (if required)

  Inner sheath, armor (if specified), and outer sheath for line protection.

• Fire-resistant performance construction

  Fire-resistant performance is achieved by selecting the required structural scheme and validating it according to the acceptance plan.

• Testing and release

  Conduct routine medium voltage testing according to relevant standards and complete any necessary fire-resistant verification and documentation.

Final availability depends on voltage rating, shielding design, and applicable standards.

(Please confirm the conductor, shielding, and sheathing systems according to your bill of quantities)

Model name used in the bill of quantities:

NH-VV (Medium Voltage 6/35kV) (Project Specifications)

Voltage Rating Options:

6/6kV, 8.7/15kV, 12/20kV, 18/30kV, 26/35kV

Application:

Medium-voltage power distribution for fire-resistant critical feeders

Conductor:

Copper or aluminum (as specified)

Core Configuration:

Single or three-core (as specified)

Medium-voltage Layer:

Conductor shield + insulation layer + insulation shield (compliant with medium-voltage standards)

Metallic Shielding Layer:

Copper strip or copper wire shield (as specified)

Armor:

Unarmored/STA/SWA (as specified by line and standards)

Outer Sheath:

PVC or LSZH (as specified)

Fire Resistance Requirements:

NH (as specified test methods and acceptance criteria)

Installation Method:

Fixed installation of medium-voltage feeder; wiring according to design (duct, tray, tunnel, trench, direct burial, if specified)

Packaging:

Export reel, cut to length according to reel drawings

Customization:

Sheath color, marking language, printing content, reel length options, accessory kit, third-party inspection support, document kit

1. Confirm the exact medium-voltage rating used in your network (15kV, 20kV, 35kV, etc.)
2. Confirm conductor selection (copper/aluminum), core configuration (single/three cores), and wiring method
3. Confirm shielding requirements and metal shield design
4. Confirm armor requirements based on mechanical risks and installation method
5. Confirm the outer sheath requirements for enclosed public lines (PVC or low-smoke halogen-free)
6. Confirm fire resistance acceptance criteria (test methods, duration/rating, report format)
7. Plan the drum length to minimize joints on the medium-voltage feeder and speed up commissioning.
8. Confirm the termination, connector, and grounding/shielding connection methods for the accessory kit (medium voltage).

Product:

NH-VV (Medium Voltage Cable, as per Bill of Materials)

Voltage Rating:

__ (6/6, 8.7/15, 12/20, 18/30, 26/35)

Conductor:

Copper/Aluminum

Core Wire:

Single Core/Three Cores

Cross-sectional Area and Quantity:

__

Metallic Shielding:

Copper Tape/Copper Wire/As Standard

Armor:

None/STA/SWA

Outer Sheath:

PVC/LSZH

Fire Resistance Acceptance:

Test Method + Duration/Rating__

Installation Method:

Conduit/Tunnel/Panel/Trench/Direct Burial (if applicable)

Total Length (meters):

__

Destination:

Country + Port__

Packaging:

Reel, Preferred Reel Length__

Required Documents:

__ (Routine Test Report, Type Test Report, Fire Resistance Test Report, Inspection Report) (Plan)

Question 1: Is NH-VV really used for 6/35kV medium voltage cables?

Answer: Some Bills of Quantities (BOQs) use "NH-VV" as a procurement label. For medium voltage projects, delivered cables must meet the agreed medium voltage construction (shielding insulation system, metallic shielding, voltage rating) and the required fire resistance acceptance criteria. Quotations and production should follow your project data sheets and standards.

Question 2: What are the common voltage ratings in 6/35kV procurement?

Answer: Typical medium voltage ratings include 6/6kV, 8.7/15kV, 12/20kV, 18/30kV, and 26/35kV. The specific selection depends on the power grid and project standards.

Question 3: What information has the greatest impact on the performance of medium voltage cables?

Answer: Voltage rating, insulation/shielding system, metallic shielding design, and termination/joint system. Fire resistance requirements are added on top of these and must comply with the acceptance plan.

Q4 Should I choose single-core or triple-core cable?

Single-core cable is widely used for medium-voltage feeders and flexible cabling. Triple-core cable can be used when installation methods and standards permit. Please confirm based on your design and installation practices.

Q5 Do I need armored cable?

A Armored cable is generally required if the cabling route includes conduit, trenches with mechanical risks, or areas affected by construction. For protected cable trays and indoor risers, unarmored cable can be used if the design allows.

Q6 What documents should I request?

A Routine electrical test reports, dimensional inspection reports, conductor resistance test reports, and any required type test reports. For New Hampshire fire resistance requirements, request your bill of quantities and the fire resistance test report format required by your inspection team.