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current that can be supplied from a controlled (maximum) voltage. To insure that this voltage is not exceeded, an intrinsically safe power supply (or battery) must be used and care must be taken to see that no other source of power can enter the system. Connection of the power source to the annunciator system should be checked for proper polarity and adequate wire size. 2.3 Optional External Pushbutton Wiring Each pushbutton input terminal of the intrinsically safe annunciator should be wired to one side of the normally open contact of an external pushbutton, the other side being connected to V+. This wiring must be physically isolated from any wiring not powered by the intrinsically safe power source. Ordinarily, this will preclude using the spare poles of the external pushbuttons for any auxiliary function. Use of a single pushbutton in a multiple cabinet installation is simplified by the incorporation of isolation diodes on the pushbutton sections. The most frequently encountered wiring error in pushbutton wiring is the use of normally closed, rather than normally open, pushbutton contacts. This, of course, has the same effect as having the operator pressing the pushbutton contin- uously. The resulting confusion is often interpreted to be a major system malfunction. 2.4 Optional External Horn and Bell Wiring If electronic horns are used as the system audibles, they may be directly driven by the horn driver outputs of the annunciator. In this case, the Ronan Model X36 Electronic Horn should be installed with its A terminal tied to the Al terminal of the annunciator and its V+ terminal tied to the V+ of the intrinsically safe power source. These connections may be made in parallel for multiple cabinets sharing the same power source. Systems using conventional vibrator -type horns and bells must use an interposing relay with a suitable contact rating. If the horn or bell is to be powered from any supply other than the intrin- sically safe power supply, this relay must be an intrinsically safe relay, such as the Ronan Model KV -700, with its foreign voltage wiring segregated from that of the annunciator. Multiple cabinet configurations powered from the same source may be connected to a single horn relay, if output isolation is not required. 2.5 Alarm Contact Wiring Alarm contact wires must be routed through the special intrinsically safe compartment in pairs and wired to 1A and 16 accordingly. The entry for the alarm contact wiring is located on the left, bottom of the enclosure. The auxiliary relay contact outputs from the alarm modules should be wired from terminals NO or NC to the field, routed through the mid - hole, provided on the bottom of the enclosure. This is general-purpose wiring and must be totally separated from the wiring to the hazardous area. 2.6 PowerrSupply Wiring The 115 VAC source wiring must be routed through the entry at the right, bottom of the enclosure and connected to the terminals identified with "H," "N" and "GROUND" accordingly. The Series X76S Leak Detector Monitor System is available in a wall -mounted, NEMA Type 1 enclosure. The enclosure holds the annunciator modules and the FM -approved Model X53-2000 Field Isolator module, with the associated power supply accessible through the front door. The clearly identified wire terminations, located on the interior rear wall, provide ease of wiring for sensor and power connection. 3.1 Field Wiring The system's field wiring is shown in schematic X76-2001 and must be followed explicitly. The system requires 115 VAC, 60 Hz, supply voltage, terminated to the appropriate terminals, to power the intrinsically safe power supply. All field wires of the sensors to be annunciated (e.g., tank levels) that are in a Class I, Division 1 area, are to be terminated to the input of the system. CAUTION: The field wires from the hazardous area must be fed to the system, separated from any circuits carrying high voltage (115 VAC) to avoid accidental connection of the high voltage or current to the hazardous area. This is a Factory Mutual requirement. 4.1 X76S Leak Detector Monitor System CAUTION: The system's internal terminations are powered by 115 VAC. Touching these terminals can cause electrical shock. The Series X76S Leak Detector Monitor System is designed for trouble-free operation and should not require troubleshooting in the field. Since the system consists of individual plug-in modules, the