| 摘要 |
The housing (1) exhibits a so-called drilling protection on the inside walls (2), which protection, when damaged or destroyed, results in the triggering of an alarm. It is formed by three layers (3, 4, 5) which are above one another and which alternately consist of conductive, non-conductive and conductive material. The two conductive layers (3, 5) each exhibit a connection contact (7) which is monitored for current continuity. The three layers (3, 4, 5) consist of enamel and can be applied to the inside walls (2) by painting, rolling or spraying. The two conductive layers (3, 5) can also consist of a metal coating. The insulating layer (4) can be formed by a micro-encapsulated enamel and a conductive fluid can be encapsulated in the insulating layer. <IMAGE>
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