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installed in such a way that a single open will not interfere with the operation <br />of any addressable devices (Class A). Outgoing and return SLC conductors shall <br />be installed in accordance with NFPA 72 requirements for Class A circuits and <br />shall have a minimum of four feet separation horizontal and one foot vertical <br />between supply and return circuit conductors. The initiating device circuit <br />(IDC) from a signaling line circuit interface device may be wired Class B, <br />provided the distance from the interface device to the initiating device is ten <br />feet or less." <br />Section 907.6.3, Initiating device identification, shall be amended to delete all <br />four Exceptions. <br />Section 907.6.6, Monitoring, shall be amended to read as follows: <br />"907.6.6 Monitoring. Fire alarm systems required by this chapter or <br />by the International Building Code shall be monitored by an approved <br />supervising station in accordance with NFPA 72. [F] See 907.6.3 for the <br />required information transmitted to the supervising station." <br />The Exceptions will remain unchanged. <br />Section 909, SMOKE CONTROL SYSTEMS, shall be amended to add Section <br />909.22, Stairway or Ramp Pressurization Alternative, to read as follows: <br />"909.22 Stairway or Ramp Pressurization Alternative. Where the <br />building is equipped throughout with an automatic sprinkler system in <br />accordance with Section 903.3.1.1 and the stair pressurization alternative is <br />chosen for compliance with Building Code requirements for a smokeproof <br />enclosure, interior exit stairways or ramps shall be pressurized to a minimum <br />of 0.10 inches of water (25 Pa) and a maximum of 0.35 inches of water (87 Pa) <br />in the shaft relative to the building measured with all interior exit stairway <br />and ramp doors closed under maximum anticipated conditions of stack effect <br />and wind effect. Such systems shall comply with Section 909, including the <br />installation of a separate fire-fighter's smoke control panel as per Section <br />909.16, and a Smoke Control Permit shall be required from the fire <br />department as per Section 105.7. <br />"909.22.1 Ventilating equipment. The activation of <br />ventilating equipment for the stair or ramp pressurization system shall <br />be by smoke detectors installed at each floor level at an approved <br />location at the entrance to the smokeproof enclosure. When the closing <br />device for the stairway or ramp shaft and vestibule doors is activated <br />by smoke detection or power failure, the mechanical equipment shall <br />33 <br />