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There are code rule that allow the use of back feeding specific breakers. Before doing any such action check with the local electrical inspector. If your thoughts are along the line of feeding a generator into the electrical panel during a power failure, don't do it. There is electrical apparatus in the market place now that allows such action, use it. Remember that you can be help liable for any damage to utility company personnel or equipment.
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Did my dryer trip the breaker or vice versa when I turned the breaker back on but now the dryer won't work?
The dryer tripped the breaker. Have it repaired. Don't try to use it again. You could cause a fire.
What size breaker is needed to supply a sub panel that is feeding a range and dryer?
If there is a possibility of both operating simultaneously, then a 100 amp breaker (actually 80 amp if you can find one), and appropriate wiring would be required. Even if they were not expected to operate simultaneously, it would be prudent to wire as if they were.
Can you take a 14 awg wire and hook it to a 12 awg wire?
Yes as long as the breaker feeding the circuit is protected with a 15 amp breaker. The code states that the over current device can be no smaller than that of the smallest current carrying conductor. That will be the #14 wire with a capacity of 15 amps.
Can you put a 60amp breaker and a 50amp breaker on a 60amp subpanel just as long as they are not being used at the same time?
You can. Using these size breakers in a 60 amp sub panel might be pushing the limit for breaking the sub panels feeder breaker. The breaker feeding the sub panel will have to be no bigger than 60 amps because of the main bus bar capacity of the sub panel. It would be better to install a 100 amp sub panel and then there would be a bit of a buffer and you will have the ability to add additional small load circuits.
How do circuit breaker keep the wires in a electrical circuit from overheating?
A circuit breaker is designed to 'break' in a circuit if a short circuit (or other malfunction) occurs. This prevents overheating (or burn-out) of the circuit wires. In older systems, you would need to find which fuse wire has fused and replace it. In a circuit breaker, once the fault has been found and corrected, the breaker is simply switched back on.
