2-Hour Fire-Rated, Mineral Insulated Copper Sheathed Wiring Cable
Description Pyrotenax System 1850 MI cable is FM Specification Tested and classified by Underwriters Laboratories as 2-hour fire resistive. When installed in accordance with Pentair Thermal Management installation procedures, the result is a UL/ULC 2-hour fire-resistive system. This certification meets the requirements of an “Electrical Circuit Protective System” as referred to in Articles 695 and 700 of the National Electrical Code (NEC). The details of this system appear in Electrical Circuit Integrity System (FHIT and FHITC), System No. 1850, of the UL and ULC Fire Resistance Directory. System 1850 cables are manufactured using only inorganic materials, copper and magnesium oxide, and arrive on the job site with a UL fire-resistive classification that does not require additional conduit or fireproofing.
Unlike a conduit and wire system, System 1850 unjacketed single conductor cables, configured according to Section 332.80(B) of the National Electrical Code or Section 4-004(10) of the Canadian Electrical Code, do not require derating and can be installed using the “free air” ratings of Table 310.15(B)(17)(NEC) or Table 1(CEC). System 1850 MI cable terminations are typically field installed. Factory terminated cable sets are also available in a range of sizes and lengths.
Applications Applications include wiring for critical life-safety circuits in high-rise buildings, subways, tunnels, airports, and health care facilities.
• High-rise buildings – emergency feeders for fire pumps, elevators, smoke extraction and pressurization
fans, fire alarm wiring, etc.
• Hospitals and other institutions where mobility is limited, to preserve power and allow time for egress.
• Historic buildings where it can be installed unobtrusively, as well as to assure preservation of fire fighting
• Tunnels and subways for smoke extraction fans, where its zero smoke properties make it unique.
• Airports, stadiums, hotels, banks, etc.
Sheath/Shield Seamless soft-drawn copper
Insulation Highly compressed magnesium oxide (MgO)
Insulation Voltage Rating 600 V
Jacket (optional) Polymer – Do not use for fire-rated applications
Continuous Exposure Temperature 250°C (482°F). 90°C (194°F) with optional jacket
Maximum Exposure Temperature 1010°C (1850°F)