以下为句子列表：
英文: The equipment placed in the hazardous area contains only intrinsically safe circuits.A circuit is intrinsically safe if no sparks of thermal effects occur under establishedtest conditions ( including the normal operating and certain fault conditions ), wh
中文: 设备内部的电路在规定的条件下，正常工作或规定的故障状态下产生的电火花和热效应均不能点燃爆炸性混合物。
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