Connecting a Redundant Power Supply 27
Table 7 Power Availability
The unearthed 48V DC power distribution provides the mechanism to
connect to the Switch 5500. The distribution consists of a number of
circuit breakers and connection terminals for the positive (common) and
negative 48V outputs. Each Switch 5500 must be individually connected
to a circuit breaker terminal.
A battery can also be connected to battery terminals prior to the DC
power distribution to provide uninterrupted power in order to protect
against the loss of AC mains power.
Specifying the
Redundant Power
System
For an approved vendor list, more details about purchasing the RPS and a
full set of requirements go to:
http://www.3Com.com/RPS
3Com’s redundant power solution allows the use of any off-the-shelf 48V
DC RPS that provides an ‘unearthed SELV’ output in compliance with IEC
60950-1/UL 60950-1/EN 60950-1, as defined in Appendix C
on
page 105
.
Connecting the
Switch to the
Redundant Power
System
When connecting the RPS to the Switch, the circuit breaker and 2-core
cable need to be matched to the power rating of the Switch. Table 8
shows the recommended circuit breaker and cable rating for the Switch
5500. The recommended cable length should not exceed 3 metres (9.84
feet).
Table 8 Switch 5500 Circuit Breaker and Cable Rating
Rectifiers
1 2 3 4 5 6
No Rectifier
Redundancy
1500W 3000W 4500W 6000W 7500W 9000W
N+1 Rectifier
Redundancy
- 1500W 3000W 4500W 6000W 7500W
Circuit Breaker Minimum 2-Core Cable Diameter
Switch 5500 6A C type 18AWG (solid or stranded cable)
DUA1715-0AAA02.book Page 27 Wednesday, March 23, 2005 11:17 AM
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