Silicon Graphics Origin200, Owner'S Manual

Page: 56 / 288

30
Chapter 2: Setting Up an Origin200 System
Choosing a Location for the Server
When choosing a location for your Origin200 server, follow the guidelines in the next
sections:
• “Providing Correct Electrical Grounding (Earthing)”
• “Supporting the Weight of the System”
• “Providing Space Around the System”
Providing Correct Electrical Grounding (Earthing)
Proper electrical grounding is critical. With a two-module system, both modules must be
on the same grounded power supply. Otherwise, the Origin200 system board will be
damaged. Modules may be connected to different electrical circuits, but those circuits
must originate at the same power supply (electrical service entrance or breaker box).
Figure 2-1 shows four possible power and grounding configurations for a two-module
Origin200 server:
• Configuration A is valid. Note that both modules are connected to the same branch
circuit, and such a circuit would be required to supply 30 A.
• Configuration B is also valid. Although the modules are on separate branch circuits,
both circuits are grounded at a service entrance.
• Configuration C is not valid . Each module is grounded in a different location, which
could result in differences in ground potential and possible damage to the modules.
• Configuration D is valid. Both modules are grounded at a subpanel.