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Wiring Conduit Safety Issues Planning Probe and Sensor Installation <br /> Wiring Conduit Safety Issues <br /> Probes and sensors operate in areas where flammable liquids and <br /> explosive vapors may be present. <br /> Ut4" Improper installation may result in fire or explosion causing serious <br /> injury or death. <br /> Practice the following: <br /> 1. Read thoroughly and follow the instructions shipped with each <br /> probe and sensor. <br /> 2. Probe and sensor wiring conduit must not contain any other <br /> wires. <br /> 3. Probe and sensor wiring and conduits must enter the console <br /> only through their designated areas (see Figure 2). <br /> 4. Power and communication wires and conduit must not enter the <br /> intrinsically safe compartment of the console. (see Figure 2). <br /> Wiring between the console and the probes and sensors is of limited electrical power <br /> so that there is insufficient energy to ignite fuel.In the console,the low power,probe <br /> and sensor wiring is considered intrinsically safe because it is physically isolated from <br /> all high power wiring.To maintain the integrity of this safety feature,you must install <br /> probe and sensor wiring in separate conduits from all other wiring.In addition,probe <br /> ® and sensor conduits can only enter the console through the designated intrinsically safe <br /> area knockouts[see Figure 2]. <br /> NOTE: Wiring from separate probes and sensors may be run in the same conduit or <br /> trough provided they are powered by the same console.Improper system operation <br /> will result if probe and sensor wiring to separate consoles share the same conduit. Do <br /> not run probe and sensor wiring to separate TLS systems in the same conduit.Do not <br /> run probe and sensor wiring with other equipment's intrinsically safe wiring in the <br /> same conduit.Improper system operation could also occur if the conduit locking nuts <br /> attaching conduit to the console are not tightened sufficiently to score the console's <br /> paint film and make good metal-to-metal contact. <br /> For proper grounding,the continuity between the conduit and grounding lugs in the <br /> power compartment should be less than 1 ohm.If necessary,use grounding/bonding <br /> set screw conduit locknuts to achieve proper conduit grounding. <br /> 14 <br />