NHXMH-J/O Cable

What is NHXMH-J/O Cable?

The NHXMH-J/O cable is a low-voltage, unarmoured, halogen-free thermoplastic sheathed building wiring cable rated at 300/500V, constructed with solid or stranded copper conductors, XLPE Type 2XI1 insulation, a halogen-free inner filler, and a grey thermoplastic polymer HM2 outer sheath conforming to VDE 0250 Part 214 and EN 60228 standards. It is available with an earthing conductor (NHXMH-J) or without an earthing conductor (NHXMH-O).

Engineered to prevent smoke density escalation and toxic gas liberation during fire events, the cable is intended for fixed installations in dry and moist interior environments, embedded in masonry, embedded in concrete, or laid in and under plaster. In contrast to standard PVC-based NYM building cables, NHXMH uses halogen-free materials complying with IEC/EN 60332-3-24 bunched fire spread tests, ensuring zero emission of corrosive halogen acid gases to protect sensitive electronic systems and maintain clear evacuation routes; however, it is not approved for underground installation.

NHXMH-J/O Cable Construction

• Conductor: Plain annealed circular copper per EN 60228; Class 1 solid for cross-sections from 1.5mm² to 10mm², and Class 2 stranded for sizes 16mm² and 25mm².
• Insulation: High-grade Cross-Linked Polyethylene (XLPE) compound Type 2XI1, delivering low dielectric loss and high insulation integrity.
• Filler: Halogen-free inner bedding compound filling interstitial voids to ensure a round, uniform cable geometry.
• Screen / Armour: Unarmoured, lightweight profile engineered for flexible handling, quick stripping, and surface mounting or conduit pulling.
• Outer Sheath: Halogen-free thermoplastic polymer compound Type HM2, flame retardant per IEC/EN 60332-3-24.
• Core Identification: 2-core: Blue, Brown; 3-core: Blue, Brown, Green/Yellow; 4-core: Brown, Black, Grey, Green/Yellow; 5-core: Brown, Black, Grey, Blue, Green/Yellow; 7 cores and above: White number-coded cores.
• Outer Sheath Colour: Grey.

Applications

NHXMH-J/O cables are engineered for surface and embedded building circuits across public facilities, commercial properties, and residential dwellings where stringent fire safety standards and low-smoke emissions are required. The cable must not be installed directly underground.

• Internal Building Enclosures: Fixed wiring in dry, damp, and wet rooms across residential, commercial, and administrative structures.
• Plaster & Masonry Embedding: Surface-mounted or embedded directly into plaster, brickwork, masonry, and reinforced concrete (excluding pre-stressed concrete).
• Public Infrastructure & Transport Hubs: Terminal galleries, metro halls, hospitals, shopping malls, and airports where toxic acid fumes threaten personnel safety.
• Data Rooms & Control Centers: Sub-distribution boards and branch circuits located near delicate electronic and telecommunication hardware.

Specifications & Dimensions

The NHXMH-J/O cable portfolio covers 1-core configurations (1.5mm² to 16mm²), 2-core (1.5mm² to 4mm²), 3-core (1.5mm² to 16mm²), 4-core (1.5mm² to 16mm²), 5-core (1.5mm² to 25mm²), and 7-core versions (1.5mm² and 2.5mm²). Operating at a rated voltage of 300/500V, the cable supports service temperatures from -5°C to +70°C and accommodates continuous conductor operating temperatures up to 90°C. The minimum bending radius is 4× overall diameter for 1.5mm²–10mm² (reduced to 2× OD at termination boxes) and 5× overall diameter for 16mm² and above (reduced to 3× OD at termination). Nominal overall diameters range from 5.2mm up to 27.0mm, with nominal weights between 92 kg/km and 1,725 kg/km. Maximum conductor DC resistance at 20°C ranges from 12.1 Ω/km (1.5mm²) down to 0.727 Ω/km (25mm²), with current-carrying capacities reaching up to 149A in free air (Reference Method E) and 138A clipped direct (Reference Method C), fully conforming to VDE 0250 Part 214 and BS 7671 Table 4E2A.

Standards

Design & Conductor Standards: VDE 0250 Part 214, EN 60228 (Class 1 Solid / Class 2 Stranded Copper)
Flame Retardancy: IEC/EN 60332-3-24 (Bunched vertical flame propagation test)
Low Smoke & Halogen-Free: Halogen-free thermoplastic compound Type HM2 and filler, releasing zero corrosive acid gases and low optical smoke
Voltage & Thermal Limits: Uo/U: 300/500V; Service Temperature: -5°C to +70°C; Conductor Max Operating Temp: +90°C
Bending Radius: 1.5–10mm²: 4 × OD (2 × OD at termination); 16mm² and above: 5 × OD (3 × OD at termination)
Regulatory Compliance: European Regulation EN 50575 (CPR Compliant), Low Voltage Directive 2014/35/EU, CE Marked, RoHS Directive 2015/65/EU, REACH EC 1907/2006

Frequently Asked Questions

Q: What is the primary difference between NHXMH and standard NYM cables?
A: NYM cables use PVC insulation and jacketing, which release corrosive hydrochloric acid gas and dense black smoke when burned, whereas NHXMH features XLPE insulation and an LSZH thermoplastic jacket that emit zero halogen acids and minimal smoke under fire conditions.

Q: What does the suffix “-J” versus “-O” indicate in NHXMH cables?
A: NHXMH-J contains a green/yellow protective earthing core, while NHXMH-O does not include an earthing core, designating all internal conductors strictly for phase and neutral wiring.

Q: Can NHXMH-J/O cable be installed underground in trenches?
A: No, the datasheet clearly states “not for underground installation”; for direct buried applications, armored or dedicated underground rated cables (such as NYY or N2XH in approved duct systems) must be specified.

Q: What payment terms does Huadong Cable accept for international industrial export orders?
A: We accept standard international commercial payment terms, including Telegraphic Transfer (T/T, with 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.

NHXMH-J/O Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures NHXMH-J/O building installation cables in strict conformity with VDE 0250 Part 214 specifications and EN 60228 conductor standards, verified through rigorous IEC/EN 60332-3-24 bunched flame propagation testing. Utilizing high-conductivity Class 1 solid copper and Class 2 stranded plain copper, our precision extrusion lines apply XLPE Type 2XI1 insulation and halogen-free bedding to ensure dielectric strength, consistent sheath concentricity, and thermal endurance up to 90°C. Encapsulated in an HM2 halogen-free outer sheath, our cables deliver easy termination, tight bending capabilities, and verified life safety across modern buildings.

With more than 20 years of precision cable engineering expertise, Huadong Cable Group operates advanced multi-wire drawing equipment, automated laying-up machines, and polymer compounding workshops certified to ISO 9001, CE, CPR (EN 50575), RoHS, and REACH protocols. By supplying directly from our manufacturing facility, we offer competitive factory pricing, 100% routine Mill Test Certificates (MTC) tested in accredited testing laboratories, tailored continuous drum lengths on export wooden reels, and seamless door-to-port logistics for electrical wholesalers, panel builders, and MEP contractors worldwide.