system sencer p2r understanding

ok i get that on outdoor p2r horn strobe needs a weather proof backbox but what i dont under stand why dose an indoor p2r need a back box as well because thay already need a slot cut out in the wall for the wire why cant thay make a nother one for the small tab on the back?

Speaking of understanding… we can barely read your post. :wink:

A surface mounted alarm is used in situations where a hole cannot be cut into the wall. To run the wires, they use conduit.

Wrong section, atrocious spelling, and horrible grammar.

what im trying to say is why cant thay surface mount the alarm becaus my school has p2rs and thay have a wire running threw the wall no conduit at all but thay have back boxes on them :slight_smile:
@prog: sorry about that :oops:

Moved to Fire Alarm Help :smiley: