Anti-interference and grounding of the data center Integrated Wiring System (1)

The Integrated Wiring System is an essential part of the safe and stable operation of modern data centers. The Integrated Wiring System generally includes the following components: computer network system, communication network system, computer room equipment automation system, security protection system, and security monitoring system. For fire-fighting alarm and linkage control systems, because of the requirements of fire prevention regulations, wiring systems should be set up separately and not included in the scope of integrated wiring systems.

1. interference of the data center Integrated Wiring System

The Integrated Wiring System is composed of several subsystems. The signal size and frequency used by each subsystem are different, so there is interference between them and various loads. In summary, the Integrated Wiring System has the following sources of interference.

1.1 interference sources from the Data Center Building

(1) high-frequency interference caused by distribution networks and distribution boxes.

(2) harmonic interference caused by electric spark of a high-power motor.

(3) interference caused by fluorescent lamps and electronic ballasts.

(4) interference caused by high-frequency switching power supply.

(5) interference caused by the ringing current of the phone.

(6) Periodic Pulse Interference Produced by information processing equipment.

If the Integrated Wiring System cannot maintain a safe distance from these sources, you can use a shielding system to reduce or eliminate interference from the above sources to the Integrated Wiring System.

1.2 sources of interference from outside the Data Center Building

Interference sources from outside the data center building are:

Radar, radio transmitting equipment, mobile phone base stations, high-voltage wires, electrified railways, and interference signals in lightning strikes.

Obviously, the external interference sources of smart buildings all have a high electric field intensity. When the Integrated Wiring System has the above interference sources, a shielding system should also be used.

1.3 sources of interference from the environment around the Integrated Wiring System

When the interference signal strength of the surrounding environment of the Integrated Wiring System or the noise level of the Integrated Wiring System exceeds the following requirements, the shielding system should also be used for protection.

(1) In a computer LAN, if the introduced interference signal frequency is l0kHz ~ At MHz, the field strength is 1 V/m, and the frequency is MHz ~ 2. 8 GHz interference signal. The field strength is 5 V/m.

(2) The frequency of introducing telecommunication terminal devices through signal DC or AC lines is 15 ~ When the interference signal is 80 MHz, the field intensity is 3 V/m (Amplitude Modulation 80%, 1 kHz ).

(3) When a terminal device with analog/digital terminal interfaces provides telephone services, the total bandwidth of the noise level exceeding 40 dB should be less than 200 MHz.

(4) the background noise should be at least 12dB smaller than the baseline level.