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UL Riser Test

Underwriters' Laboratories (UL) has established a fire test facility for the purpose of listing cables that
meet NEC requirements.

This test chamber is an eight by four simulated shaft, twelve feet high between the source of ignition
and the floor above. A very large propane burner, 145 K W (495,000 BTU/hr) is ignited for a period of
30 minutes. Flames must not extend above the 12 foot mark if the cable is to be UL Classified for this
duty.