Access control and intruder cabling should be segregated from mains to reduce interference and prevent induced voltages. (iii) cable tray and cable ladder systems classified as non-flame propagating according to BS EN 61537, or (iv) powertrack systems meeting the requirements of BS EN 61534. Through NEMA and the Cable Tray Institute numerous articles, standards, and other general guidance can be found regarding the proper use and installation of cable tray systems. Security and communications systems do not normally require enhanced fire resistance unless they are part of the life safety strategy (e. 2* All conductors for underground trainways or stations, except radio antennas, train control (signaling) cables, and traction power cables, shall be enclosed in their entirety in armor sheaths, conduits, or enclosed. Provides requirements for fire alarm cables, raceways, separation, power-limited and non-power-limited circuits, and wiring methods. All conductors or cables shall be installed using any of the metal wiring methods permitted by 708,10 (C) (1) and, in addition, shall comply with the following, as applicable: All cables for fire alarm, security, signaling systems, and emergency communications shall be shielded twisted pair cables.
Read More
