testing for drilled cable

Thermal Imaging
That would only work if the damage had already created a local high impedance that resulted in temperature rises. As I've been saying, the problem is that damage done now might have no effect (on impedance, IR or anything else) at present, but may evolve into a problem further down the road.

Kind Regards, John.
 
As I've been saying, the problem is that damage done now might have no effect (on impedance, IR or anything else) at present, but may evolve into a problem further down the road.
Yes, and that damage may well involve the grab rail becoming live. The OP doesn't say where the grab rail is, but even if it isn't in a wet zone, a live grab rail isn't recommended :roll: If it is in a wet zone, well all I'll say is that I wouldn't want to have an RCD as the only protection to grabbing a live conductor while wet and stood with my feet in water.
 
As I've been saying, the problem is that damage done now might have no effect (on impedance, IR or anything else) at present, but may evolve into a problem further down the road.
Yes, and that damage may well involve the grab rail becoming live. The OP doesn't say where the grab rail is, but even if it isn't in a wet zone, a live grab rail isn't recommended :roll: If it is in a wet zone, well all I'll say is that I wouldn't want to have an RCD as the only protection to grabbing a live conductor while wet and stood with my feet in water.
Exactly, and I would have thought that it's very likely that it is in a 'wet zone'.

Kind Regards, John.
 

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