The success or failure of any attempt to forcefully penetrate a fence system is dependent upon three primary factors that collectively define the threat—the tools and devices employed, the number of aggressors, and their level of sophistication.
Normally, a test procedure of this scope would be supported by years of laboratory testing intended to qualify and accurately reproduce the destructive effects of a variety of tools, implements, and devices. However, rapidly changing social conditions have created an immediate need for building components resistant to evolving forced entry techniques. Accordingly, the procedures presented herein are based more on field experience than laboratory analysis. They are more representative than inclusive, are intended to provide a basis for the comparative evaluation of different fence systems using forced penetration procedures and are not intended to be used to establish or confirm the absolute prevention of forced entries.
TABLE 1 Schedule of Testing—All Levels of Threat Severity
| Time of Application (minutes) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Structured Testing | Discretionary Testing | |||||||
| Tool(s) | L | M | A | L | M | A | ||
| Crowbar 5 lb by 28 in. (2) | 3-5 | 3-5 | 3-5 | 0-55 | 0-55 | 0-55 | ||
| Cold Chisels and Hammer (2) | 3-5 | 3-5 | 3-5 | 0-55 | 0-55 | 0-55 | ||
| Hacksaw and Two HSS Blades | 3-5 | 3-5 | 3-5 | 0-55 | 0-55 | 0-55 | ||
| Sledgehammer 16 in. by 6 lb | 3-5 | 3-5 | 3-5 |
ASTM F2781-09 history
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