New answers tagged cabling
40 watts at 12 vac is about 4 amp which leaves plenty of headroom on the 12ga cable (which is normally rated for 20 amps (with heat loss and safety factors included). But what if your wire gets cut? Shorted? the worst case max current that a 300 watt transformer can put out (if it really is a 300 watt not a 310 watt or 315 watt) is 25 amps which is flirting ...
An network alternative to ethernet or powerline is MoCA using the cable coax that already exists in many homes. Also you could go wireless A1C modems, faster than G or N. Ethernet is the best option but MOCA works well and is fast enough to stream videos/movies. Powerline is great for data and networking, but interference can occur for streaming movies.
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