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

TABLE 2 Forced Entry Resistant Ratings

The test requirements specified herein have been established for use in evaluating the penetration resistance characteristics of standard fence systems to be used in commercial, government and military installations.

The success of any forced entry threat is dependent on the cumulative effect of the implements used, the elapsed time, and the sophistication and motivation of the personnel affecting the forced entry.

Absolute penetration resistance from forced entry by a determined and well-equipped attack group is impossible.

Aggressor groups range from unsophisticated criminals and vandals to organized criminals.

Attempts to force an entry may be thwarted by increasing the time necessary to affect such an entry and by early detection. Intrusion sensors positioned as far as possible from the protected environment in conjunction with optimal structural and component design will maximize the time available for a response force to intercept the intruders.

The procedures of this test method are intended to evaluate the time necessary for vandals and unsophisticated criminals to forcefully penetrate security fence systems by using manually operated tools-defined as a low, medium, or aggressive forced entry threat.