I am currently running conduit for Cat5e cable in the home office I am finishing off. Are there any rules in the code for how far off the floor Category 5 wires in conduit must be run?
No. Cat 5 cabling can be run on the ground or underground. If you are worried about it working just make sure the coating isn't torn/cut and it is capped properly. If you are worried about code violations - no inspector cares unless the cable is interfering with something else he cares about.
My experience level - ran communications cable for large internet provider for 4 years both in the field and in-house. If you run cable underground there is code specific sheathing needed. Not really sure this would apply for cat5 because that wouldn't be used for long runs. I personally have buried cat5 cable 1 foot under by 50 feet to set up a link in a shed that now works just fine 8 years later - without piping. Hillbilly but works perfect.
If I were doing my house I would run it 7-8 inches off the ground. Just because that is usually a spot that has little chance to be nailed/screwed.
Actually I wouldn't run cabling in my house. You run cables now and in 2-3 years wireless is faster. Seriously what could you be doing at your house that wireless wouldn't work? They make 1GB wireless routers for under $100. Soon 10GB will be the norm. Your internet speed - if it is blazing blazing fast - goes at 100 MB. That is 10 times less than your 1GB wireless throughput. Also your computer will only be able to process so much data being saved to it. I have my house teched out to the max (video/music hub server, print server, 10 devices online, virtual servers, mac/pc) and I haven't thought for a second running cables. Unless you are looking at selling your house soon to a couple in their 40/50s (the only demographic where cabling was known to) I see this as being pointless from a pure tech standpoint. My advice - take all the money that you were spending on this project - read reviews - buy a good router, buy a repeater if you are worrying about reception to devices, buy a central hub device (NAS) to store and share your stuff and enjoy.
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