3com 5500-ei pwr Guia De Configuração Rápida

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.

For an approved vendor list, more details about purchasing the RPS and a 
full set of requirements go to:

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 

.

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. 

 

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

1500W

3000W

4500W

6000W

7500W

9000W

-

1500W

3000W

4500W

6000W

7500W

Switch 5500 6A C type

18AWG (solid or stranded cable)

DUA1715-0AAA02.book  Page 27  Wednesday, March 23, 2005  11:17 AM