ICOT, how about providing some more info.
1) Is there a reliable color code for hot vs. neutral, or can it only be ascertained with a meter?
2) What is major difference between neutral and ground?
3) Can the electrical box be considered to be grounded? I.e., if no third wire, and there is a need to connect something to a reliable ground, will a connection to the box suffice? For example, when installing a 3-prong outlet where previously only an older 2-prong outlet existed, can one just assume the ground terminal will be grounded by virtue of a connnetion to the box?
4) If a line is rated at 15 amps, what is highest one can safely use continuously, i.e., for an air conditioner? I have heard up to 80% or 12 amps. Does the number on the circuit breaker always correspond with the actual gauge of the wire used?
5) In older houses, does the wiring ever fray and present a fire hazard over the years, or can one assume the insulation remains effective even after many years?
Thanks