bus that is electrically isolated from the panel frame. Install an insulated equipment
grounding conductor (sized the same as the supply conductors) in the same
conduit as the supply conductors from the main or source power panel. Terminate
the equipment grounding conductor on the ground bus in the main or source panel
and on the isolated ground bus in the Non-Dedicated Power Panel.
• Do not select the Power Panel supplying heavy equipment within the facility as the
Non-Dedicated Power Panel supplying the MICROS equipment.
• Dedicate all MICROS AC Power Circuits for MICROS equipment. Do not use
these circuits to supply any equipment other than MICROS equipment.
• Install all MICROS AC Power Circuits in a dedicated conduit system. This
dedicated conduit system cannot contain circuits other than MICROS circuits.
Ensure the conduit used for the MICROS AC Power Circuits is ferrous metallic.
Flexible, rigid, or greenfield-metallic conduit is acceptable. Aluminum conduit is
not acceptable.
• For each dedicated MICROS AC Power circuit, include a full size (same as supply
conductors) insulated equipment grounding conductor installed within the same
dedicated conduit system as the supply conductors. Terminate this ground
conductor at the isolated ground bus in the Non-Dedicated Power Panel and on
the grounding terminal of each Isolated Ground AC Power Receptacle.
• Ensure all AC Power Receptacles are the isolating ground type. Install according
to the specifications in the AC Power Receptacles Grounding section.
• When choosing a base, mid-level, or premium Power Conditioning system, an
upgrade to the next level is required if problems occur (e.g. power problems
generated by the power company or other equipment in the building).
Power Conditioned AC Power System
This method is an acceptable alternative when the Preferred or Relaxed/ Power
Conditioned AC Power System is cost prohibitive and/or would require major structural
changes. However, the Preferred AC Power System is recommended by MICROS.
The Power Conditioned AC Power System is described as follows:
• MICROS-approved AC Power Conditioners are required at
all MICROS equipment
locations.
• MICROS-approved Uninterruptable Power Conditioners (UPC) are required at
each server.
• Whenever possible, all MICROS equipment should be installed on the same sub
panel. However, MICROS equipment can be supplied by different non-dedicated
AC power sub panels, but the sub panels should be supplied by the same main or
source panel. If multiple main or source panels are utilized, ground potential
problems could arise and severely degrade the performance of the system, even if
AC power conditioners are used. Line Drivers or Optical Isolation Devices may be
required on selected data transmission cable runs to eliminate the effects of
ground potential problems.
• Whenever possible, any Power Panel supplying heavy equipment within the facility
should not be selected as the power panel supplying MICROS AC Power Circuits.
Equipment problems resulting from utilizing a Power Panel supplying heavy
equipment will be reviewed on an individual basis.
Chapter 22
Additional Methods for AC Power
22-5
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