Re: Metamec electric clocks. Unsafe?
Class 0 equipment (neither earthed nor double-insulated) has minimal protection against electric shocks designed-in. But the actual risk level depends on the quality of the insulation and whether it has deteriorated over time. Much of the risk is mitigated by the use of RCDs which were not available when this equipment was being made.
My preference is not to modify but to ensure I test RCDs regularly and when dealing with something unusually dangerous (e.g. devices from 100 years ago with exposed live parts) to use an isolating transformer.
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