• A testing body formed primarily to certify fire safety of electrical equipment dealing with voltages greater than 48 VAC or DC. UL has the most recently assumed the responsibility for certification of data grade unshielded twisted pair media for conformance to EIA/TIA and NEMA specifications. The cable categories III through V from the EIA/TIA TSB 36 document serve as the basis for UL cable LEVELS 2 through 5. Cable certified by the UL to meet these standards would bear a marking indicating.