CHAPTER 2. Installing Basic KSU and Expansion Cabinet2-10 © SAMSUNG Electronics Co., Ltd.2.6 GroundingA three wire for AC grounding via AC power cord should be used for the OfficeServ 100system However, if it is suspected that there is a problem with the ground provided at ACoutlet or local codes require a solid earth ground to be connected to the KSU, the existingthird wire ground must be disconnected before power is applied. The existing three wireground is disconnected by removing the holding screw and tapping and storing the wire.After this wire has been disconnected, the grounding lug on the PSU(Power Supply Unit)must be connected to a ground rod or metal cold water pipe using #A10 AWG solid copperwire.Failure to provide an adequate ground may cause intermittent problems or even circuit cardfailure.Before connecting the groundUnplug the power cord from the AC outlet before attempting to connect theground. Hazardous voltage may cause death or injury. Observe extreme cautionwhen working with AC power. Remove champ connectors.2.7 MDF CablingAll connection to the OfficeServ 100 system are made by way of a customer-providedMDF(Main Distribution Frame). The KSU and expansion kit are each connected to theMDF using a 25 pair female amphenol-type cable(with the exception of the TEPRI, ITM3,MGI3 cards). These cables can be routed into the KSU cabinet from below.(See Figure 2.7& 2.8)Use one pair twisted wire to cross-connect stations or lines to their associated port.
