Grounding method of communication power supply system
Proper grounding of communication power supply systems ensures safety, equipment protection, and reliable operation by connecting AC and DC power systems to a common protective earth.
AC Power Grounding
Communication equipment rooms typically use the TN-S power supply mode, where the neutral and protective earth are separate conductors. The AC power inlet should include a lightning protection device rated for a nominal discharge current of at least 20 kA to protect against surges and lightning strikes. The protective ground for the AC power supply should be shared with the communication equipment, ideally using the same protective ground bar if both are in the same room, ensuring a unified grounding reference and minimizing potential differences that could damage equipment or create safety hazards .
DC Power Grounding
For DC systems, such as the common -48 V DC telecom power supply, the positive terminal is typically grounded at the output of the DC power supply. In 24 V DC systems, the negative pole is grounded. This grounding serves multiple purposes: it stabilizes the voltage reference, prevents corrosion of equipment, and ensures personnel safety . The working ground (used for normal operation) and the protection ground (used for fault conditions) of DC equipment should be connected to the same grounding body as the protective ground of switching equipment, maintaining a consistent reference potential across the system .
Surge and Lightning Protection
Both AC and DC interfaces should include surge protection circuits to prevent damage from transient overvoltages. For AC, this is typically a C-level surge protector at the power inlet. For DC, surge protection should be added at the DC interface to safeguard sensitive communication equipment .
General Principles
Grounding systems in communication networks follow the same principles as general earthing systems, connecting conductive parts to the earth to prevent electric shock and ensure electromagnetic compatibility. Proper grounding allows fault currents to flow safely to earth, triggering protective devices like fuses or circuit breakers, and maintains a stable voltage reference for sensitive electronics . Using a common grounding body for AC, DC, and equipment grounds reduces potential differences and improves system reliability.
Summary
- AC power: TN-S system, shared protective ground, lightning protection at inlet.
- DC power: positive (-48 V) or negative (24 V) grounded at supply output, working and protection grounds unified.
- Surge protection: required for both AC and DC interfaces.
- Unified grounding: minimizes voltage differences, protects equipment, and ensures personnel safety. Following these grounding practices ensures safe, reliable, and long-lasting operation of communication power supply systems.
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