HP DL360 Power basics for IT professionals - Page 16

HP DL360 - ProLiant - G3 Manual

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Figure 13. Typical grounding of commercial or industrial building In the United States, the National Electric Code specifies the standard grounding system resistivity value of 25 ohms. It is common practice that large industrial plants and commercial buildings require maximum 5-ohm resistivity values in the ground grid. Instrument systems generally require only 1-ohm resistivity values. When considering sensitive electronic equipment, there are three IEEE Standards that should be referenced. These standards are listed in Table 1. Table 1. IEEE power and grounding references IEEE Standard Standard Title IEEE Standard 1100-1999 IEEE Standard 142-1991 IEEE Standard 446-1995 IEEE Recommended Practice for Powering and Grounding Electronic Equipment (Emerald Book) IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems (Green Book) IEEE Recommended Practice for Emergency and Standby Power Systems for Industrial and Commercial Applications (Orange Book) 16

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Figure 13
. Typical grounding of commercial or industrial building
In the United States, the National Electric Code specifies the standard grounding system resistivity
value of 25 ohms. It is common practice that large industrial plants and commercial buildings require
maximum 5-ohm resistivity values in the ground grid. Instrument systems generally require only 1-ohm
resistivity values.
When considering sensitive electronic equipment, there are three IEEE Standards that should be
referenced. These standards are listed in Table 1.
Table 1.
IEEE power and grounding references
IEEE Standard
Standard Title
I
EEE Standard 1100-1999
IEEE Recommended Practice for Powering and Grounding Electronic
Equipment (Emerald Book)
IEEE Standard 142-1991
IEEE Recommended Practice for Grounding of Industrial and
Commercial Power Systems (Green Book)
IEEE Standard 446-1995
IEEE Recommended Practice for Emergency and Standby Power Systems
for Industrial and Commercial Applications (Orange Book)
16