We had a fire the other day from the DirecTv unit. Thank God we were home and put it out quickly with the outdated fire extinguisher. The SWM unit on DirecTv units puts out 25 volts DC. The antenna connection came loose and after enough sparking vola a fire started in the walls. Word to the wise, keep the antenna wire very tight to avoid this. 40 bucks in repairs, and 80 bucks in new larger fire extinguishers and we are back in business. (not counting the two days of cleanup from the fire extinguisher powder)  We were blessed and now turn the SWM unit off every time we leave.