larry818 Posted July 24, 2014 Report Posted July 24, 2014 I don't see a better place to post this, so here goes... I have several RS485 runs going through underground conduits. The local inspector is demanding that we use UL Listed direct burial cable, which I'm not finding anywhere. I can find many cables that are 100?, but I have several long runs at the end that are the proper 120? cable, and I'm concerned with mixing impedances. Does anyone know of proper 120? RS485 (Can bus, DMX, etc...) direct burial cable that's listed? Thanks, Larry Quote
larry818 Posted July 30, 2014 Author Report Posted July 30, 2014 Ok, if anyone ever needs to know this... it doesn't exist, but Belden can do a custom run, 5000' for $4,475.00, and it's UL listed. Quote
MrAutomation Posted August 22, 2014 Report Posted August 22, 2014 I've run plenty, plenty, plenty of RS485 on standard single twisted pair Teck Cable. Use a 120 ohm termination resistor. Quote
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