It depends on the application. Will this be run in a home or business? What routing will be used? Conduit, open, in the wall, ceiling...
If it is run in conduit or at home, go cheapest route. Plenum is not typically required.
You may need to check local code, in most businesses with open air returns like false ceiling areas, it is required to use plenum. If the air return is closed off, you should be able to avoid plenum.
If you are running in false ceilings, you will also want to avoid light or electrical fixtures.
Try not to cross electrical lines when possible, or run over a spacer to avoid contact and line noise.
If you are running phone, it can be cheaper to run Cat3, however running Cat 5e or better allows for future upgrades or conversion to network lines. Run Cat6 or better if you plan on going gig in the near future.
It depends on the application. Will this be run in a home or business? What routing will be used? Conduit, open, in the wall, ceiling...
If it is run in conduit or at home, go cheapest route. Plenum is not typically required.
You may need to check local code, in most businesses with open air returns like false ceiling areas, it is required to use plenum. If the air return is closed off, you should be able to avoid plenum.
If you are running in false ceilings, you will also want to avoid light or electrical fixtures.
Try not to cross electrical lines when possible, or run over a spacer to avoid contact and line noise.
If you are running phone, it can be cheaper to run Cat3, however running Cat 5e or better allows for future upgrades or conversion to network lines. Run Cat6 or better if you plan on going gig in the near future.