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To maintain the intrinsically-safe integrity of the TLS system,sensor and probe <br /> conduits can share the same trenches with power conduits,but the intrinsically safe <br /> sensor and probe wiring can NOT share the same conduit with any other wiring.Also, <br /> intrinsically safe wiring for TLS systems can NOT share the same conduit with other <br /> equipment's intrinsically safe wiring. <br /> 1. Install rigid conduit(3/4, 1,or 1-1/4"I.P.S.)from all probe and sensor locations to <br /> the console's location.Knockouts for 3/4, 1,or 1-1/4"I.P.S.conduit are provided <br /> in the intrinsically safe area of the console for probe and sensor wiring [see <br /> Figure 2]. <br /> 2. The conduit must be properly sealed in accordance with the latest National <br /> Electric Code(NFPA 70)and the Automotive and Marine Service Station Code <br /> (NFPA 30A)since they pass from a Class I,Division 1 or 2 hazardous area into a <br /> non-hazardous area <br /> Existing Sites <br /> If the TLS system is being retrofitted into a paved site,you can either dig out trenches <br /> in the pavement to run rigid conduit out to sensors and probes,or you can cut grooves <br /> in the pavement,run direct burial cable to these devices,and then seal over the cable <br /> grooves.Perhaps you will decide on a combination of the two methods. <br /> Before trenching,you should diagram all conduit runs between the console's intended <br /> location and its deployed sensors and probes.Your site diagram will help you calculate <br /> conduit and wiring lengths,and necessary quantities of junction boxes,sealing boxes, <br /> clamps,brackets,etc. <br /> Reminder:to ensure optimum signal strength,plan sensor and probe wiring lengths <br /> with no splices between the field junction box connection and the interface module <br /> connection in the console.Every splice in the hazardous area requires the use of an <br /> epoxy sealing kit and degrades signal strength). <br /> Throughout this planning process and in the actual installation,you must follow all <br /> latest National Electric Codes,and applicable federal,state,and local codes as regards <br /> conduit type,depth below grade,sealing,grounding,wire capacities,direct burial(if <br /> permitted),etc. <br /> 13 <br />