HYC_50 – Operation and Installation Guide
Hardware
Version 1-2
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Figure 40: Main switch with connected cables
8.3. Review of the protective measures
For this check, it is mandatory to turn off the main switch (QB1) and have a digital multimeter
ready.
Attention
Switch off the main switch beforehand!
Figure 41: Digital multimeter for voltage free testing
Check the resistance between the earth of the supply and all externally accessible, non-
insulated cabinet parts (housing, attachments, screws).
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