Sagem 4450E - Manual (Page 49)

SAGEM 3P@C
3P@C Installation Manual
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SAGEM SA
The load bearing capacity of the equipment room floor should be more than 450 kg/m 2 (when
storage batteries are contained in the cabinet). Considering the weight of the lead-acid battery, the
load bearing capacity of the floor of the battery room should be more than 500 kg/m
2 when
equipped with the battery below 500AH and more than 600 kg/m 2 when equipped with the battery
above 800AH. The load bearing capacity of both the corridor and staircase should be 400 kg/m 2
(where there is no storage battery), with the overload coefficient being 1.4.The load bearing
capacity of other places except for the equipment room should not be lower than 300 kg/m
2 . In
case of old buildings, the load bearing capability should be improved if the indices do not satisfy the
requirements.
3.1.4. Heat Dissipation Requirements
Good ventilation should be ensured for the operating environment of the equipment so as to meet
the heat dissipation requirements of the internal components of the equipment. In particular,
sufficient space (no less than 0.8 m) is required for both the front face and the rear face of the
equipment at the place near the fans. Air inlet and outlet should not be blocked and weights are not
permitted on the equipment.
3.1.5. 3.1.5. 3.1.5. 3.1.5. Power Supply Requirements
When –48V DC power is adopted to supply power to 3P@C 4450E, the allowed variation of the
voltage should be -36V ~ -72V when measured at the DC input terminal of each cabinet. When the
conductor of the DC discharge loop is selected, the through voltage dip of the DC discharge loop
should be no more than 0.5V and the core diameter of the DC power cable should be no less than
16mm
2 .
When AC power supply is adopted, reliable and stable AC mains power and lead-in wires should
be selected. Since 3P@C 4450E consumes little power, it can adopt the 220V single-phase three-
wire power supply system after conversion by the power transformation equipment. The
specifications of the power cable should be calculated according to the equipment quantity and
their power consumption, so as to meet the relevant specification requirements and taken into
account sufficient security. In its full configuration, the 3P@C 4450E switch needs more than
1200W power.
3.1.6. 3.1.6. 3.1.6. 3.1.6. Grounding Requirements
When 3P@C 4450E is used in a large data communication office and is installed in a 19-inch
cabinet with DC power supply, according to the General Technical Requirements (Provisional) for
the Power Supply System of a Communication Office (Station) issued by the former Ministry of
Posts and Telecommunications, the working ground, the protection ground of all communication
equipment as well as the lightning protection ground of the building where the communication office
of 3P@C 4450E is located should share a centralized grounding mode via a group of grounding
devices, i.e. joint grounding mode.
When AC power supply is adopted for 3P@C 4450E, the power sockets (as shown in Figure 3-1)
using neutral point connectors are recommended and the neutral point of the power cable should
be reliably grounded in the building. Generally during the engineering cabling of the building, the
neutral points of the power supply system of the building have been buried and users should
confirm if the power supply of this building has been reliably grounded.