Fri Nov 20, 2009 8:59 pm
The actual law that I saw regarding battery backup for sirens was that if more than 15,000,000 people live within a 50-mile radius, then the sirens within the 10-mile EPZ must be able to function without utility AC power. It seems like somewhat of an odd number to come up with, and there may be more rules than just that.
http://youtube.com/CrazySirenBoy
Proud owner of: Thunderbolt 1003, Thunderbolt 1000, STH-10A, Model 5BT, Model 5B, Model 3B, Model 2T (noon daily @ 1/2 voltage), Model 2, Decot, Sterling Little Giant