Cisco MDS 9500 Series Hardware Installation Manual page 84

Preinstallation
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Caution
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Caution
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Cisco MDS 9500 Series Hardware Installation Guide
2-4
Avoid UPS types that use ferroresonant technology. These UPS types can become unstable
with systems such as the Cisco MDS 9000 Family, which can have substantial current draw
fluctuations because of fluctuating data traffic patterns.
Ensure that circuits are sized according to local and national codes. For North America:
The 1900-W AC power supplies require a 20-A circuit.
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– The 1900-W DC power supplies require a 70-A circuit.
– The 2500-W AC power supplies require a 20-A circuit.
– The 2500-W DC power supplies require a 100-A circuit.
– The 4000-W AC power supplies require a 30-A circuit.
The 6000-W AC power supplies require two 220 V inputs at 20-A circuit.
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If you are using 200/240 VAC power sources in North America, the circuits must be protected by
two-pole circuit breakers.
To prevent loss of input power, ensure that the total maximum loads on the circuits supplying
power are within the current ratings of the wiring and breakers.
Record your installation and configuration information as you work. See
Planning and Maintenance Records."
Use the following screw torques when installing the switch:
– Captive screws: 4 in-lb
– M3 screws: 4 in-lb
M4 screws: 12 in-lb
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M6 screws: 20 in-lb
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10-32 screws: 20 in-lb
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12-24 screws: 30 in-lb
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Chapter 2 Installing the Cisco MDS 9500 Series
Appendix E, "Site
OL-19587-01