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Using a male-to-male cable is NEVER a good idea. If the generator were running and the house end of the cable got knocked loose, you'd have exposed terminals with 30+ amps of 240v, just waiting to electrocute someone or start a fire. You are much better off wiring up a proper inlet and using a standard generator cable.
Reliance Controls makes a device called a powerback alarm, model THP108. Here it is on Amazon: http://www.amazon.com/Reliance-Controls-THP108-Pow...It has a current sensor that wraps around one of the incoming lines from the meter. When the power goes out, you hit the interlock, turn on the generator, turn on the powerback alarm, and then when the main power is restored this little alarm will go off, letting you know that you can shut down your generator and switch back to main power. I have one and it works well - my only complaint is that it's hard to hear the alarm going off in the garage (where my panel is) from inside the house when the generator is running.
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