- Used in critical areas where standard high temperature lead wire is not sufficient to maintain circuit integrity due to extreme temperatures, or exposure to open flame
- Used for equipment wiring in iron mills, steel mills, glass plants, and cement kilns

- UL approved lead wire 450°C
- IEEE 383 modified 210,000 BTU vertical tray flame test at 1800°F, with circuit integrity for 2.5 hours minimum
- Non-UL operating temperature can withstand up to 2400°F short term.