Preferred AC Power System

All power conductors and equipment grounding conductors must be isolated from other power circuits in the facility to ensure that electrical noise produced by other equipment does not create interference for the system hardware.

To accomplish this, install a power distribution panel intended for the sole use of the MICROS hardware. Do not use this dedicated panel to supply other electrical loads in the facility. Run the panel’s feeder supply directly from the main source panel for the facility.

Figure 24-1 Preferred AC Power System Panel Wiring


This figure shows the preferred AC power system panel wiring.

This figure illustrates the preferred AC power system panel wiring. All branch circuits include a separate neutral and equipment grounding conductor unless otherwise indicated. Consult the AC Power Consumption section to determine the maximum number of computers, workstations, and devices powered from a single circuit.

Notes on the Preferred AC Power System:

  • The figure above does not supplant national, state, or local electrical codes.

  • Install each Branch Circuit in a dedicated ferrous metal conduit with separate neutral and ground conductors. Aluminum conduit is not acceptable.

  • If the length of a branch circuit exceeds 100 feet, increase all conductors (including ground) one wire size for each additional 100 feet of length.

  • The neutral conductor from the main or source panel to the dedicated MICROS panel is two sizes larger than the phase conductors. The larger wire size is necessary to accommodate the third harmonic current caused by the switching power supplies in the MICROS equipment. It also minimizes the possibility of common mode noise occurring on the power distribution circuits.

  • Install all power distribution circuits in a dedicated ferrous metal conduit that contains only the MICROS supply and ground conductors.

  • Install all data communication cables in separate ferrous metallic conduits. The Cable Requirements section provides information about installing the data communications cables.

  • Ensure all AC Power Receptacles are the isolating ground type. Install according to the specifications in the AC Power Receptacles Grounding section.

  • For Servers, an Oracle MICROS-approved Uninterruptable Power Supply (UPS) is required.

Despite the proper installation of the Preferred AC Power System, it is possible to have power problems resulting from the power company or from other equipment in the building. If this occurs, use the Oracle MICROS-approved Power Conditioners to correct.