MMO / MMJ HF Cable

What is MMO / MMJ HF Cable?

The MMO / MMJ HF Cable is a harmonized, halogen-free flame-retardant thermoplastic cable rated at 450/750V, constructed with circular solid copper conductors, halogen-free polyolefin insulation, an extruded halogen-free filler, and a UV-resistant halogen-free polyolefin outer jacket conforming to HD 308 S2, EN 60754-2, and EN 61034-2 standards. The range is divided into MMO for multi-core control circuits (featuring black cores with white numbering) and MMJ for primary power and lighting circuits (featuring standardized colored cores including a protective green/yellow ground wire).

Engineered for high-density public venues, commercial complexes, and industrial plants, this cable is designed for fixed surface installations or routing inside conduits and trunking. Under fire conditions, the polyolefin compounds are self-extinguishing and exhibit zero after-burning, fulfilling EN 60332-3-23 bunched flame spread criteria. The zero-halogen formulation releases no corrosive acid gases and produces very low smoke emissions, ensuring clear escape corridors and safeguarding sensitive electrical switchgear from corrosion.

MMO / MMJ HF Cable Construction

• Conductor: High-conductivity circular solid plain copper conductor offering mechanical rigidity and dependable terminal termination.
• Insulation: Halogen-free polyolefin compound engineered for dielectric integrity and thermal performance up to +70°C.
• Filler: Halogen-free interstice filling compound ensuring a compact, circular cross-section and simple stripping.
• Screen / Armour: Unarmoured, lightweight construction optimized for easy pulling through conduits, cable trays, and wall channels.
• Outer Sheath: UV-resistant halogen-free polyolefin compound providing mechanical protection and self-extinguishing flame retardancy.
• Core Identification: MMO: Black cores with sequential white numbering; MMJ: 3-core (Green/Yellow, Blue, Brown) and 5-core (Green/Yellow, Blue, Brown, Black, Grey) per HD 308 S2.
• Sheath Colour: White.

Applications

MMO and MMJ halogen-free cables are designed for fixed electrical wiring and control signal links in buildings requiring high fire safety and low environmental toxicity. They are suitable for indoor and outdoor installations, surface mounting, and routing within protective conduits, but must not be laid directly in soil or cast directly into wet concrete.

• Commercial & Public Venues: Fixed lighting and sub-distribution power feeds in airports, hospitals, shopping centers, and schools.
• Industrial Control Panels: MMO multi-core control wiring for automation cabinets, machinery interlocks, and signaling runs.
• Surface & Conduit Installations: Cable runs in exposed indoor trunking, perimeter raceways, and enclosed wall conduits.
• Outdoor Protected Runs: UV-resistant outdoor cable trays and sheltered facades shielded from direct ground burial.

Specifications & Dimensions

The MMO / MMJ cable series covers conductor sizes from 1.5mm² to 16mm², with MMO control configurations available in 7, 12, 19, and 27 cores (1.5mm² and 2.5mm²) and MMJ power configurations in 3 cores (1.5mm² to 10mm²) and 5 cores (1.5mm² to 16mm²). Operating at 450/750V with an operational temperature range of -15°C to +70°C and a short-circuit rating of 160°C, it requires a minimum bending radius of 9 times the overall diameter. Conductor DC resistance values at 20°C are 12.1 Ω/km (1.5mm²), 7.41 Ω/km (2.5mm²), 3.08 Ω/km (6mm²), 1.83 Ω/km (10mm²), and 1.15 Ω/km (16mm²), with overall outer diameters ranging from 11mm (MMJ 3×1.5mm²) to 29mm (MMO 27×2.5mm²) adhering strictly to standard manufacturing tolerances.

Standards

Design & Testing Standards: HD 308 S2, EN 60754-2, EN 61034-2
Flame Retardancy: EN 60332-3-23 (Bunched cable vertical flame spread test)
Halogen-Free Performance: Non-corrosive gases per EN 60754-2; low smoke density per EN 61034-2; self-extinguishing with zero after-burning
Voltage Rating (Uo/U): 450/750V
Temperature Spectrum: Operating Temperature: -15°C to +70°C; Maximum Short-Circuit Temperature: 160°C
Mechanical Bending: Minimum Bending Radius: 9 × overall diameter
Regulatory Compliance: European Regulation EN 50575 (CPR Compliant), Low Voltage Directive 2014/35/EU, CE Marked, RoHS Directive 2015/65/EU, REACH Directive EC 1907/2006

Frequently Asked Questions

Q: What is the primary difference between MMO and MMJ cable variants?
A: MMO is designed for multi-core control applications featuring black cores with printed white sequential numbers, while MMJ is designed for electrical power distribution featuring colored cores that include a protective green/yellow earth wire per HD 308 S2.

Q: Can MMO / MMJ HF cables be installed directly in the ground or in fresh concrete?
A: No, the specification explicitly dictates that these cables are not to be laid directly in soil or cast directly into wet concrete; they should be run on surfaces, trays, or within protective conduit systems.

Q: What are the primary safety benefits of halogen-free polyolefin insulation and sheathing?
A: Halogen-free polyolefin does not release corrosive hydrochloric or hydrofluoric acid vapors when burned, preventing secondary acidic corrosion to electrical switchgear and minimizing opaque smoke generation to facilitate safe emergency evacuation.

Q: What payment terms does Huadong Cable accept for international export shipments?
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.

MMO / MMJ HF Cable – Why Choose Huadong?

Huadong Cable Group manufactures MMO and MMJ halogen-free cables in strict compliance with HD 308 S2, EN 60754-2, and EN 61034-2 standards, verified through rigorous quality testing regimes including EN 60332-3-23 bunched flame spread tests. Utilizing high-purity circular solid plain copper conductors, our advanced extrusion lines apply premium halogen-free polyolefin insulation and filling compounds to ensure stable electrical insulation resistance and clean stripping properties. Finished with a UV-resistant, flame-retardant white polyolefin jacket, our cables deliver reliable physical protection and life safety in demanding commercial and industrial building installations.

With more than 20 years of continuous cable engineering experience, Huadong Cable Group operates modern stranding, extrusion, and material compounding facilities certified under ISO 9001, CE, CPR (EN 50575), RoHS, and REACH protocols. By purchasing directly from our manufacturing facility, contractors and project developers gain competitive factory pricing, 100% Mill Test Certificates (MTC) issued by accredited testing facilities, customized drum lengths packaged on ISPM 15 heat-treated export reels, and seamless global logistics support.