Description

The plenum wiring concept, as we know it today, was established approximately 13 years ago as a fire safety and life saving measure. This concept was developed as a direct result of a near disastrous fire which occurred in a telephone company office in the early 1970s.During the early stages of plenum development, the only materials meeting the critical low flame spread and low smoke requirements for these cables were the high temperature, fluoropolymer type materials.Since qualification of these cable constructions for plenum use is primarily dependent upon compliance to the flame and smoke requirements of the Underwriters Laboratories UL 444 Specification.