IBM zSeries 800 Installation Manual

Also see for 800: Parts manual Product overview

Contents

Table 3-3. Power Plugs and Receptacles - 200-240 Volts (continued)Feature Code Voltage Description Watertight PlugWatertightReceptacleNotes:1. IBM continues to strongly recommend the use of a metal backbox (example shownbelow) with our line cords using IEC-309 plugs. Although in-line connectors andnonmetalic backboxes are available and compatible, they are not recommended. Theserecommendations are based on the metal backbox providing:v An added level of protection against a miswired phase and ground reversalv In some cases, a metal backbox may be better for EMI mitigationYou may choose not to use a metal backbox. In this case, please check your local codefor specific requirements.2. The customer must obtain appropriate plugs and receptacles, based on existingelectrical codes, where those plugs and receptacles are not provided with the system.Grounding SpecificationsEvery single-phase branch circuit must contain two phase conductors (or one phaseand neutral) and an insulated equipment-grounding conductor.For 200 V ac through 240 V ac installations in the United States, theequipment-grounding conductor must be identical in size, insulation material, andgauge to the branch circuit phase conductors, except that it must be green with orwithout one or more yellow stripes on the insulation. For installations outside theUnited States, the size of the grounding conductor must be in accordance with localcodes.Conduit must not be used as the only grounding means. However, any conduit orcable shield must be connected at both ends in such a way that it is included in thegrounding path in parallel with the grounding conductor it contains. IBM stronglyrecommends that branch circuit wiring be located in metallic conduit, or be madefrom shielded cable, if located under a raised floor. Even when not required by localregulations, some form of shield around the branch circuit wiring is preferred as ameans of reducing coupling of high-frequency electrical noise into signal and controlcables.There is information about additional recommendations and requirements forequipment grounding on IBM’s Resource Link web site(http://www.ibm.com/servers/resourcelink). See ″General Information for Planning aPhysical Site″.Level 04a, June 21, 2004Chapter 3. Power Requirements 3-3||