IR test bellow 1Meg

Double check - do you mean 1k ohm (thousand ohms) or 1000 k ohm = 1meg = 1 million ohms ?


A meg, or even a few hundred k, is an entirely believable leakage for equipment in a damp location.


less than a few tens of k isn't  and  10k passes  23mA  if L-E  on a 230V supply and in the wrong place that current is on the edge of fatal.


(In terms of shock currents, less than a mA you probably will scarcely feel it , 10mA is really painful, and by 100mA if the RCD does not take it off in a heartbeat or two, you are a goner.  Luckily the contact resistance of small regions of dry skin, shoes and clothing often conspire to keep otherwise dangerous shocks to the sub 10mA level where you can pull away and swear a bit,  but you should never rely on it - good contacts with damp hands on spanners or hand rails, can make even voltages lower than 50V quite  dangerous. There have been fatalities with 28v military vehicle electrics, where folk have been badly injured before electrocution, and the normally semi-insulating skin is damaged and wet with blood, though to be fair they may well not have made it anyway.)


As a rule of thumb for the basis of C1 vs C2  on inspections

C1 is immediately dangerous (there are already enough faults to give someone a fatal shock, live parts exposed)

C2 is could become dangerous (one more entirely credible event /fault  could make this dangerous)  - like it sounds like we have here - for example if the earthing relies on the mounting and the bolts are on paint instead of metal)

Double check - do you mean 1k ohm (thousand ohms) or 1000 k ohm = 1meg = 1 million ohms ?


A meg, or even a few hundred k, is an entirely believable leakage for equipment in a damp location.


less than a few tens of k isn't  and  10k passes  23mA  if L-E  on a 230V supply and in the wrong place that current is on the edge of fatal.


(In terms of shock currents, less than a mA you probably will scarcely feel it , 10mA is really painful, and by 100mA if the RCD does not take it off in a heartbeat or two, you are a goner.  Luckily the contact resistance of small regions of dry skin, shoes and clothing often conspire to keep otherwise dangerous shocks to the sub 10mA level where you can pull away and swear a bit,  but you should never rely on it - good contacts with damp hands on spanners or hand rails, can make even voltages lower than 50V quite  dangerous. There have been fatalities with 28v military vehicle electrics, where folk have been badly injured before electrocution, and the normally semi-insulating skin is damaged and wet with blood, though to be fair they may well not have made it anyway.)


As a rule of thumb for the basis of C1 vs C2  on inspections

C1 is immediately dangerous (there are already enough faults to give someone a fatal shock, live parts exposed)

C2 is could become dangerous (one more entirely credible event /fault  could make this dangerous)  - like it sounds like we have here - for example if the earthing relies on the mounting and the bolts are on paint instead of metal)