Samsung OfficeServ 7400 Technical Manual
Also see for OfficeServ 7400: System administration guideUser guideUser instructionsTechnical manualGeneral description
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OfficeServ 7400 INSTALLATIONTECHNICAL MANUAL PART 1 MAY 20101.3Bare, covered, or insulated grounding conductors are acceptable. A covered or insulatedgrounding conductor shall have a continuous outer finish that is either green or green withone or more yellow stripes.Failure to provide an adequate ground may cause a safety hazard, confusing troublesymptoms, or even circuit card failure.WARNING: Unplug the power cord from the AC outlet before attempting to connect theground. Hazardous voltage may cause death or injury. Observe extreme caution whenworking with AC power. Remove lines from trunk cards.What the above paragraphs mean is that when conventional analog telephone circuits areconnected to the OfficeServ 7400 system, under fault conditions (i.e., the tip and/or ringconductor is crossed with a power line, or the circuit is affected by lightning during a storm), itis possible for hazardous potentials to appear across the tip and ring wiring coming into theOfficeServ 7400 cabinet(s) from the outside plant (i.e., overhead cables, buried cables, cablehead pedestal). These circuits are provided with both primary and secondary protectioncircuitry which will attempt to drain off these high voltages and currents to earth ground.Obviously, it is important to have a good source of ground connected to the OfficeServ 7400system to drain this energy off. Again, a good earth ground source is required by theOfficeServ 7400 system.The OfficeServ 7400 system has two ground reference points. One point is via the green wirein the power cord connected to the AC power outlet. This ground connection is provided tomeet local electrical codes when the AC ground is required to be common with the earthground. However, this can be disconnected either intentionally or unintentionally.Consequently, a more permanent ground connection is required by connecting a highcurrent/voltage capacity ground wire which is bonded to ground at the electric service powerentrance or via some other method approved by the National Electrical Code to theOfficeServ 7400 system ground lug. This is a more secure ground connection, which can onlybe disconnected intentionally. These precautions are taken for safety reasons to protectpersonnel working on the OfficeServ 7400 system and also for operational reasons toaccommodate ground return and/or ground-referenced analog telephone circuits, whichrequire this solid earth ground connection for normal functioning. |
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