_
.-:
Power engineering 553-3001-152
Engineering and configuration guidelines 65
-
No lighting, air conditioning, heating, generators or motors shall be
serviced from this equipment room panel.
-
In areas where isolated ground systems are permissible, this panel will
provide sufficient ground connection points on the isolated ground plate
or bar to handle the AC circuit grounds as well as the other ground
reference conductors associated with the Meridian 1.
Service receptacles
One dedicated outlet per pedestal (column) is a typical
requirement for AC systems that are cord connected. For DC systems, or if
reserve power is being used, the receptacles or conduit will serve the
centralized rectifiers cr UPS system directly, with power then routing to the
columns.
Unless otherwise specified, these circuits should be rated for 30 Amps. All
circuits must be:
-
Wired and fused independently of all receptacles.
I.
-
Tagged at the power panel to prevent unauthorized interruption of power.
-
Not controlled by a switch
The NEMA receptacle types are as follows:
-
Isolated Ground systems: IG-L6-30
-
Non-Isolated Ground systems: L6-30
-
System grounding requirements
Proper grounding is essential to trouble-
free system operation and the safety of personnel. The Meridian 1 has several
different grounds and signal returns that are generally referred to as grounds:
logic return, battery return (for DC systems), AC “green wire” ground (in AC
systems), and the personal hazard equipment ground.
The Meridian 1 does not, by design, need an AC Isolated Ground (IG) system
(though this may be required by local codes), but it does need a single point
ground system. This means that each of the various grounds, from each of the
columns, should terminate at a single connection point before attaching to the
actual ground reference at the main AC panel or transformer. The single-
point ground may be implemented either by the use of the Isolated Ground bus
in the AC panel, or by a separate logic return equalizing bus for battery
returns, frame grounds, and logic returns where a non-isolated AC system is
used.