Yes it senses the power is back on and makes the piercing alarm until you shut it off.
Yes it will work just fine.
A good Electrician can make a small notch or hole in the sheetrock or plaster wall, and bring the unit wiring past the flush mounted cover, allowing the PowerBack Utility Power Return Alert unit to be mounted to the wall.
No. The lead that senses current is a predetermined length.
When I initially hook this device up under normal power conditions, will it immediately alert? -- Yes, if you flip the switch to turn it on if there is power it will sound its buzzer..... its LOUD too.... so very easy to see if you have it installed correctly.... the install is VERY simple... wrap the inductive coil around one of the utility feed to the main 100/200amp breaker and connect to the common rail.... and then mount the device in a punch out hole on the side of the panel.... unscrewing the panel cover took longer than the install!
Yes, definitely! The wiring for this unit gets connected inside the Main Electrical Panel. Anytime there is a need to go inside your Main Electrical Panel, it is extremely dangerous for a non-electrician to do so! I can't stress this enough. If you don't know what you're doing, and you touch the wrong thing inside that panel box, even for the briefest moment, you could get electrocuted. This is no joking matter. Only Licensed Electricians should do any work inside the Main Electrical Panel. Period!
Not until you turn it off.
use a nema 3 weather proof enclousure
Suggest you purchase on-line via HomeDepot.com and pick-up at your local store. That's how I got mine, took about a week.
Check at Home depot.com for availability of this item.