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Siemens 8DA Operating Instructions Manual page 32

Medium-voltage switchgear, extendable fixed-mounted circuit-breaker switchgear up to 40.5 kv, single busbar, single-pole metal-enclosed, metal-clad, sf6-insulated

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Installation
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10.3 Mounting the metal covers
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11 Tests
11.1 Checking the SF
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Gas leak detection
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Checking the gas pressure
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Checking the gas quality
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-gas filling
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