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But if the cpc is connected from the appliance to new cpc plus old cpc as well as the CU end the cpc should be continuous up to the point of loss of contact... But on both ends. Although if there were 2 losses in contact along the length..
Obviously the op said it would be easy to replace so has done a bit of service by providing protection against exposed parts so therefore is a reasonably good temp fix
Your assuming the old cpc is good until the old connection. It might have failed 100mm from the CU.