Every year I do a periodic inspection of all portable electrical stuff in the house, pretty much a PAT test, with a few extra checks. Had a near-failure this year, on an infrequently used 10m long Type 2 charge cable. In theory, anything over 1MΩ on an insulation test is a pass, but the majority of things I test tend to give a full scale reading for insulation resistance (199.9MΩ for my MFT). when I tested this 10m cable this year, I initially got an insulation resistance reading of just over 1MΩ, in theory a pass, but so far different from its usual reading of 199.9MΩ as to make me very suspicious that something was awry. This cable was last used just before I sold my i3, so perhaps 6 weeks ago, and it may well have been raining at the time. I decided that water in the connector was possibly the most likely culprit, so took the connector apart, and sure enough it was very wet inside: I'll leave this to dry for a few days and test it again. Judging by the light corrosion on some internal screws I'd say that it's been wet for some considerable time. Unlike the Dostar and Rolec connectors, that have a drain hole at the bottom, this connector does not, so any water that gets in cannot get out. I shall drill a small drain hole in the bottom before I reassemble it! The moral of this story is to get your cables periodically inspected and tested. It only takes a few minutes to do, and is well worth it for peace of mind. I doubt there's a risk from having a degraded cable like this, but there is a possibility that it would just trip the RCB/RCBO, and so stop you being able to charge. Could be a nuisance if away somewhere and reliant on getting a charge from a destination charge point. Finally, if anyone wants their cables checked (not ones tethered to equipment) and they are within reasonable travelling distance from me (roughly half way between Salisbury and Shaftesbury, just off the A30) I will happily test them for free.