Rru optical cable grounding

RRU optical cables should be grounded using the shielding layer connected to PGND or OT terminals, ensuring grounding resistance below 10 ohms and proper mechanical attachment.Grounding ProcedurePower Cable Shielding Connection Strip a small portion of the RRU power cable jacket to expose the shielding layer. Press the exposed shielding onto a grounding strap and connect the PGND cable on the strap to the nearest grounding bolt on the RRU side, typically on the APM30/APM30H module .OT Terminal for DCDU Connection When connecting the RRU power cable to a DCDU (e.g., DCDU-03C), form an OT terminal from the shielding layer. Attach this OT terminal to the corresponding PGND terminal on the DCDU port to ensure proper grounding .Grounding Resistance Requirement The grounding resistance of the PGND cable should be less than 10 ohms to maintain effective grounding and prevent electrical hazards .Use of Grounding Kits For optical jumper cables (1/2" or 5/8"), standard grounding kits use a mechanically attached ground strap with an expansion rib to prevent over-tightening. This ensures a secure and reliable connection without damaging the cable .Additional Installation ConsiderationsWaterproofing: Wrap joints with waterproof tape in three layers, spirally upward, downward, and upward again, ensuring the upper layer covers half of the lower layer .Torque Specifications: Tighten screws on cover plates and grounding connections according to manufacturer specifications (e.g., 1.4 N•m for cover plates, 35 N•m for pole fixtures) .Cable Management: Maintain sufficient spacing for maintenance and avoid connecting the PGND cable directly to the grounding terminal; only the shielding layer should be grounded .SummaryProper grounding of RRU optical cables involves connecting the shielding layer to PGND or OT terminals, using grounding kits for optical jumpers, and ensuring low resistance (