Mineral Insulated Fire Rated Wiring from nVent PYROTENAX
November 3, 2025
Worldwide regulations require fire protection for emergency feeder circuits in commercial buildings, public spaces, hospitals, industrial plants and refineries. PYROTENAX System 1850 mineral insulated fire-rated cables are UL listed and can withstand temperatures up to 1850 °F / 1010 °C for two hours, ensuring critical equipment and processes continue to operate in the event of a fire.
nVent PYROTENAX System 2000 and 2200 2-hour fire-rated cables can withstand temperatures up to 2200 °F / 1200 °C for two hours, facilitating the controlled shutdown of critical processes and systems in the event of an industrial fire such as a hydrocarbon flash fire.
Historically, fire safety of critical circuits was achieved by running conventional cables behind a heat barrier such as a gypsum board or hollow concrete block; or by embedding the conductors in concrete.
nVent PYROTENAX System 1850 Bare Fire Rated Cable is a range of mineral insulated (MI) 2-hour fire-rated wiring cable for critical and essential circuit protection. It consists of solid copper conductors in a continuous copper sheath (System 1850) and is allowed to be used under virtually any application conditions by both the NEC and CEC. Cable terminations are typically field installed. Factory terminated wiring units are available in a range of sizes and lengths.
Applications
- Fire alarms and emergency lighting
- Fire pumps
- Emergency elevators
- Smoke extraction and emergency ventilation fans in tunnels
- Backup generators
- Industrial and petrochemical plants
- And more
nVent PYROTENAX mineral insulated cable combine dependability, versatility and performance with exceptional temperature and electrical performance. This inorganic and inherently fire-resistant construction means zero smoke, zero flames, and zero fuel contribution.
Features
- Ultimate performance: fireproof, no smoke generation, zero halogens, high mechanical strength and corrosion resistance, waterproof and non-ageing
- UL fire-resistive classified, does not require additional conduit or fireproofing
- UL Classified/ ULC Listed: tested to the UL 2196/ULC-S139 fire test standards
- Meets requirements of an Electrical Circuit Protective System, as referred to in Articles 695 and 700 of the National Electrical Code (NEC)
- System 1850 appears in Electrical Circuit Integrity System (FHIT and FHIT7) of the UL/ULC Fire Resistance Directory
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