S12800 Routing Switch Installa
tion Manual V1.0
Maipu Confidential & Proprietary Information
Page 125
If the AC directly provides power for the device, the power supply voltage exceeds –10%
to 5% of the rated voltage, or exceeds the permitted voltage range of the device. We
should adopt the voltage regulator to meet the requirement.
It is required that the AC uninterruptible or transient communication load should adopt
the UPS power supply system or inverter power supply system to provide power.
When the AC becomes abnormal, to ensure the important communication load and
important power load, the telecommunications site should be configured with the
generator set as the self power supply. The capacity should be no less than 1.5-2
multiples of the total capacity of the AC uninterruptible powered device.
E. Device Grounding Specification and Protection
E.1
Device Grounding Specifications
The grounding specifications include universal grounding specification, building grounding
specifications of equipment room, device grounding specifications, grounding specifications of
communication power, and grounding wire laying specifications.
E . 1 . 1 Un i v e r s a l G r o u n d i n g S p e c i f i c a t i o n s
The universal grounding specifications are as shown in appendix table E-1:
Appendix table E-1 Universal grounding specifications
No.
Description
1
Grounding design should comply with the voltage sharing and equipotential principle, that is, the
work grounding and protect grounding (including the shielded grounding and lightning grounding
of distribution frame) share one group of grounding.
2
The cabling rack, hanging metal frame, rack or cabinet, metal ventilation pipe, metal doors and
windows in the equipment room should be connected to the earth for protection.
3
The unpowered metal parts of the device should be connected to the earth for protection.
4
Ensure that the grounding wire well contacts with the protection grounding bar of the equipment
room.
5
Do not use other device as an integral part of the grounding wire in electrical communication.
E . 1 . 2 Bu i l d i n g G r o u n d i n g S p e c i f i c a t i o n s of E q u i p m e n t Ro o m
The specific requirements for the building grounding specifications of the equipment room:
The grounding resistance of the integrated communication building should be no more than
1ohm; in the common communication site, it should be smaller than 5ohm (for the area with
high soil resistivity, it can be raised to 10ohm).
