With a 5 second breaking time you need to be holding something attached to the circuit at the instant the fault occurs, or at least within 4 and a half seconds of it, or the overvoltage dissappears, or is not there long enough to kill you.
The 70V might just be there all day until the fault is cleared, as the equipment will run earth return instead of neutral, the chances of touching it are much higher.
It may a 'safe' voltage for continuous exposure, based on hands to feet in the test conditions, but the contact area is small, and I'm not sure it is the right model for a car in a front garden where children may play - I detect a desire to justify the highest possible rise of earth potential to make installation easier, rather than good science to make the installation safe.
With a 5 second breaking time you need to be holding something attached to the circuit at the instant the fault occurs, or at least within 4 and a half seconds of it, or the overvoltage dissappears, or is not there long enough to kill you.
The 70V might just be there all day until the fault is cleared, as the equipment will run earth return instead of neutral, the chances of touching it are much higher.
It may a 'safe' voltage for continuous exposure, based on hands to feet in the test conditions, but the contact area is small, and I'm not sure it is the right model for a car in a front garden where children may play - I detect a desire to justify the highest possible rise of earth potential to make installation easier, rather than good science to make the installation safe.
