Pyrotenax MI 4-Core 2.5mm² Fire-Rated Mineral Insulated Cable

The nVent Pyrotenax 105-4C2.5 is a mineral insulated fire-rated cable with four 2.5 mm² copper conductors individually insulated in compacted magnesium oxide within a seamless copper sheath, providing fire circuit integrity to BS 6387 Category CWZ and IEC 60331-21 standards for power and control circuits in the most critical life safety applications. The four-conductor configuration and increased 2.5 mm² conductor cross-section serve the broader range of emergency power supply applications compared to the two-core fire detection variant: the 105-4C2.5 is the standard specification for three-phase emergency lighting supply final circuits (using three line conductors plus neutral in a 3P+N arrangement), single-phase emergency power to critical loads with protective earth, fire suppression system pump motor supply cables, and firefighters' lift motor circuits — all applications requiring the higher current-carrying capacity of 2.5 mm² conductors and the circuit configuration flexibility of four cores.

Saudi Aramco's GI-0002.100 fire protection general instruction and the associated SAES-E electrical standards specify mineral insulated or fire-rated cable for emergency power supply circuits at all process plant facilities, requiring cables that maintain electrical function throughout the full design fire duration to ensure that suppression systems, emergency lighting, PA/VA, and safe shutdown instrumentation remain powered until process isolation is complete. The 105-4C2.5 addresses the supply cable requirements for these loads: at ARAMCO's Abqaiq Plants and Ras Tanura Refinery, emergency lighting panels, fire pump motor control centres, and the emergency diesel generator output feeders to critical loads are all wired in Pyrotenax MI 105-4C2.5 specification to satisfy this requirement. The cable's 250°C continuous operating temperature also makes it suitable for cable routes that pass through the hot zones of a process plant fire — furnace rooms, heater houses, and fired equipment areas — where conventional cables would fail within minutes.

For high-rise developments under Saudi Arabia's National Building Code and Civil Defence requirements — which are closely aligned with BS 5839-6 for automatic fire alarm systems and BS 5266 for emergency lighting — the 105-4C2.5 is specified for emergency lighting final circuit distribution from the central maintained emergency lighting panel to remote emergency luminaire groups. In commercial towers exceeding 23 m height (the Saudi Civil Defence threshold for additional fire safety requirements), emergency lighting cables must maintain circuit integrity for at least 60 minutes at 830°C to satisfy the relevant clauses of the Saudi Building Code's fire safety chapter. The Pyrotenax 105-4C2.5's BS 6387 CWZ rating dramatically exceeds this requirement with survival at 950°C — providing civil defence authorities with the confidence needed for occupancy permit approval.

Razz Middle East supplies Pyrotenax 105-4C2.5 in drum lengths from 25 m to 500 m with full termination hardware: copper pot seals, threaded entry glands, test links, brass and stainless steel clip assemblies, and both indoor and outdoor termination kits with heat-shrink moisture barriers. Our life safety system engineers provide fire cable system design aligned with Saudi Civil Defence, ARAMCO GI-0002.100, and SABIC fire detection specifications, including route design, current rating calculations, BS 6387 compliance submissions, and authority approval documentation packages for major project submissions.