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Table 41.1 Assumed Touch Voltage
Former Community Member
I am a bit confused by this. Why do the disconnection times in Table 41.1 appear to be based on a touch voltage of 100 volts rather than a touch voltage of 125 volts?
For example, 110% of 230= 253 volts. Assuming L and PE are of the same size and material, indirect contact touch voltage is 126.5 volts. Would 0.33 seconds not appear more realistic?
a lawnmower, or strimmer, or WHY on a 50 m lead covers a semi-circle of about 4000 m².
But does not need 40 off 32A ring final circuits to provide the power to it, which the 100m2 rule may suggest...
Nor is it feasible to consider it part of any well earthed equipotential zone. Indeed if you stick two electrodes in 50m apart there is a sporting chance of finding them a few volts apart even when nothing much is happening, from currents passing through, even before you introduce any faults of your own.
There is a very good reason that lawnmowers, strimmers etc are double insulated, not earthed metal, and it is a pity that electric car makers have not followed suit - it would have been technically harder to make a double insulated switch mode power supply for a few KW, but by no means impossible to arrange.
Mike
PS.. From which we can deduce that Mike is a mere slip of a lad and no more than 57 years old. ?
Thank you. I think. I was born in 1967 so a mere 54 if that helps you narrow it down. (and despite the grey hair and all the rest, I still got asked 'are you over 18' by what looks like a schoolchild at the checkout when buying paint thinners. )
a lawnmower, or strimmer, or WHY on a 50 m lead covers a semi-circle of about 4000 m².
But does not need 40 off 32A ring final circuits to provide the power to it, which the 100m2 rule may suggest...
Nor is it feasible to consider it part of any well earthed equipotential zone. Indeed if you stick two electrodes in 50m apart there is a sporting chance of finding them a few volts apart even when nothing much is happening, from currents passing through, even before you introduce any faults of your own.
There is a very good reason that lawnmowers, strimmers etc are double insulated, not earthed metal, and it is a pity that electric car makers have not followed suit - it would have been technically harder to make a double insulated switch mode power supply for a few KW, but by no means impossible to arrange.
Mike
PS.. From which we can deduce that Mike is a mere slip of a lad and no more than 57 years old. ?
Thank you. I think. I was born in 1967 so a mere 54 if that helps you narrow it down. (and despite the grey hair and all the rest, I still got asked 'are you over 18' by what looks like a schoolchild at the checkout when buying paint thinners. )
