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City of South Bend Central Services Division <br />Fire Service, Inc./Wheeled Coach Ambulance <br />Specification <br />that is easily accessible. All components on the circuit board are to be <br />permanently labeled as to their function. <br />The printed circuit board shall be designed and manufactured as follows: A screen <br />printed board with all circuits fully numbered and labeled. The circuit board shall <br />be a double -sided copper trace printed circuit with a double -sided laminated <br />isolator. The board shall be non -photo image able solder mask over bare copper <br />with hot air leveled solder over non masked copper. Fuse capacity is the <br />beginning factor in calculating trace width to ensure proper current carrying <br />capability. The circuits shall then be oversized as much as space permits for <br />maximum cooling of the board. All holes shall be plated through. The terminal <br />strips shall be mounted on the board for connection of the above mentioned <br />wiring harness. Automotive transient suppressers must be incorporated into circuit <br />board at the point of cable entry to the board. All relays must include built in <br />noise suppression. The suppression must be accomplished with a IN4001 parallel <br />with the coil. The relay must have a 40 ampere continuous contact rating with one <br />form C contact arrangement. Normally open contact must have a maximum initial <br />voltage drop of 200 millivolts at 40 ampere contact load. The relays must <br />withstand 24 VDC for five minutes conducting rated contact current in case of <br />accidental 24 volt jump start condition. Circuit board options must be <br />programmable via jumpers to facilitate addition of options. The color of wire and <br />circuit number must be screened printed at the terminal block connections on the <br />board for rapid identification and relation to schematics. <br />Documentation that the above requirements are met must be included with the bid <br />document. <br />The printed circuit board shall incorporate red LED indicators for on board <br />diagnostics for input, output, and switching circuits for troubleshooting at a <br />glance. <br />CIRCUIT BOARD CERTIFICATION <br />The printed circuit board must meet the following specifications: <br />10070-0003 11 /05/20 <br />34 <br />