Medium Voltage Cable Insulation/Jacket Tracking
Medium Voltage Cable Insulation/Jacket Tracking
(OP)
My building has 13.8kv feeders that come in underground thru manholes. We opened up one and saw some dark discoloration that appears to be not only on the cable, but on the metal cable support. Has anyone seen anything like this. Is this a "tracking" issue. All grounds are good and there have not been any failures in the past. The cable is about 20 years old. It's an Okonite 133% EPR cable I believe. I attached a photo if the upload worked.






RE: Medium Voltage Cable Insulation/Jacket Tracking
RE: Medium Voltage Cable Insulation/Jacket Tracking
RE: Medium Voltage Cable Insulation/Jacket Tracking
RE: Medium Voltage Cable Insulation/Jacket Tracking
RE: Medium Voltage Cable Insulation/Jacket Tracking
RE: Medium Voltage Cable Insulation/Jacket Tracking
RE: Medium Voltage Cable Insulation/Jacket Tracking
If your really concerned, remove a section of fire wrap and take a look at the cable itself. Should be fine.