The Siren Board

Discussion of Outdoor Warning Systems
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PostPosted: Wed Feb 26, 2020 6:52 pm 
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Joined: Sun Dec 04, 2016 7:51 pm
Posts: 130
Real Name: Sean
YouTube Username: Sean juth
Location: Huntsville, Alabama
I'm building a homemade siren that I plan to put up in my backyard, I do however have some problems I need to get fixed. The whole setup weighs 25 pounds, is mounted on a fence post, and the center of gravity is off. Can anyone give me specific details regarding digging the hole and setting the pole securely with out concrete?

Sean C
I own a whelen 2800 cell, and a a&a auto alarm siren
I want the model d from Paint Rock Alabama
Huntsville Alabama Native

PostPosted: Sat Feb 29, 2020 2:23 am 
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Joined: Fri Feb 18, 2011 11:49 pm
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I found these recommendations from PG&E for temporary service poles: 20 ft above ground, 4 feet below ground. This means whatever the exposed length of the pole will be above ground, you need to have 1/5 of that length below ground. You need to dig a narrow hole with a cone shaped bottom to keep the pole centered while you are setting it. Then after backfilling around the pole, ram the soil good and hard to pack it down. Maybe do that several times as you fill in the hole to make sure all the soil around the post is fully packed. Whatever length pole you have, you probably should have at least 3 feet of the length set underground, but for poles longer than 18 feet follow the 1/5 rule.

Guying wires might be necessary until the ground has fully hardened. ... 025055.pdf

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