Just a couple of comments on the electrical portion of this thread. The hazard with extension cords under rugs comes from the fact that they are typically made of fine strand wire in molded on insulation. When people walk on the wire under the rug it abrades the two conductors against each other and the failure mode has been for the wires to start to come in contact with each other and/or break. Since they are so small individually, they can not drop enough current to trip a breaker. They can however catch on fire easily and also overheat due to the decreased effective ampacity of the wire as the strands break.
This is more common than you may think and is the major reason for the new arc-fault circuit breaker requirement. Think of the arc fault as a little guy sitting in front of an osciloscope watching for a wave form that indicates a brief fault and tripping the circuit when that happens. Remember, the NEC is written, in large part, in response to the insurance industry. If they weren't paying losses in significant amounts they wouldn't require the arc faults.
Ground fault requirements started the same way. When enough people with insurance insisted on using their hair dryers in the bath tub, they said find a way to protect these people from themselves.
BTW, Triplex is not listed for installation in conduit. When you see a service done like this it is a sign of a cheap job.
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