Potter Installation Manual SCI Short Circuit Isolator

TN51319e 0 01.05 2011 Manual SCI Short Circuit Isolator TO THE INSTALLER manual provides an overview and the installation instructions for the Short Circuit Isolator SCI This SCI only compatible with addressable fire systems that utilize the Potter Nohmi addressable protocol terminals are power limited and should be wired in accordance with the requirements of NFPA 70 NEC NFPA 72 National Fire Alarm Code Failure to follow the wiring diagrams in the following pages will the system to not operate as intended For further information refer to the control panel installation module shall only be installed with listed control panels Refer to the control panel installation manual for system operation SCI is used to provide additional reliability for a fire protection system by isolating a segment of an SLC in which a short circuit has occurred This makes it possible for the remainder of the loop to provide monitoring functions employs one red LED to indicate the status In normal condition the LED is deactivated When the short is happened SCI will cut off the short circuit and turn on the LED Once the short is removed the SCI automatically restore the loop to the intended operating condition resistance 10 addressable device 50 units area to be isolated by the short circuit cucuit diagram Class B Style 4 Wiring B Style 4 Wiring Resistance of wiring connected to SCI must not exceed 10 ohms A maximum of 50 addressable and addressable modules be connected to a SCI Class A Style 6 Wiring A Style 6 Wiring The wiring resistance between Short Circuit Isolators must exceed 10 ohms A maximum of 50 addressable and addressable modules be connected between any two wiring resistance an SCI and another shall be less than 10 1S 2S 2 1S 2S 2 1S 2S 2 2 1 2 1 1S 2S 2 PFC 8500PCA ALE 127 terminal 1 Class B Style 4 Wiring Diagram area to be isolated by the short circuit cucuit 1 2 1 2 must be for same zone These SCIs shall be installed within feet from terminal of PFC 8060PCA orALE 127 Figure 2 Class A Style 6 Wiring Diagram PFC 8500PCA ALE 127 terminal 1S 2S 2 Class A Style 7 Wiring For Class A Style 7 each device close nippled with the SCI and all the wirings between SCIs and devices must be installed in conduits area to be isolated by the short circuit cucuit Class A Style 7 Wiring The wiring resistance between Short Circuit Isolators must exceed 10 ohms 2 1 2 1 1 2 1 2 wiring resistance between SCI and another SCI shall less than 10 PFC 8500PCA 1S 2S 2 ALE 127 terminal These SCIs shall be installed 20 feet from terminal of PFC PFC 8500PCA orALE 127 Figure 3 Class A Style 7 Wiring Diagram SLC loop wiring S 1 S 1 S 2 and S 2 are power limited Wiring for terminals S 1 S 1 S 2 S 2 are supervised When multiple zones are configured to Notification Appliance Circuits NACs those NACs must be by SCIs per zone All wiring is between 14 2.08 mm2 max and 22 0.32 mm2 min Wire Preparation all wires 1 4 inch from their edges as follows inch 6.4 mm Stripping too much insulation may cause ground fault Stripping too little may cause a poor connection and subsequently an open circuit Instruction 4 Installation in Electrical Enclosure to 24.0V voltage range of SLC input power S S Maximum SLC 24 VDC standby current S S Maximum SLC 24 VDC active current S S Wiring resistance or wiring after a SCI in Class B style 4 10 Wiring resistance or wiring between a SCI and Resistance SCI in Class A style6 and 7 Maximum no of SCI on an SLC loop in Class B style 4 Maximum no of SCI on an SLC loop in Class A style 6 units units 7 Maximum no of addressable device connected to a SCI Operating temperature range Operating humidity range Dimensions Applicable electrical box for installation units to 120 0 to 49 to 93 non condensing H 4.17 W 1.14 D 2 gang box 4 box 1 1 2 box instructions do not purport to cover all the details or variations in the equipment described nor provide every possible contingency to be met in connection with installation operation and maintenance subject to change without prior notification Technical Assistance contact Potter Electric Signal Company at 800 325 3936 performance is based on proper application of the product by a qualified professional further information be desired or should particular problems arise which are not covered sufficiently the purchaser s purpose the matter should be referred to Potter Nohmi or a distributor in your region Electric Signal Company LLC Park 370 Place Hazelwood MO 63042 USA 866 956 1211 http www pottersignal com