- Grounding is an issue. Make sure you do not have a ground potential issue. Also, install an ESD/surge device just to help. Cheap, and better safe than sorry.
- Honestly, media converters and/or SFP capable network switches aren't expensive. Conduit plus fiber doesn't have any of these issues. Worth considering.
- Use proper outdoor/direct burial rated cable (regular cat5/6 isn't gonna survive..)
- Grounding is an issue. Make sure you do not have a ground potential issue. Also, install an ESD/surge device just to help. Cheap, and better safe than sorry.
- Honestly, media converters and/or SFP capable network switches aren't expensive. Conduit plus fiber doesn't have any of these issues. Worth considering.