There are a couple of schools of thought on that that I am aware of. I usually test to approximately double the working voltage. so if you are testing 230V, use the 500V scale, 460V, use the 1000V scale.
__________________
Perfection is achieved, not when there is nothing left to add, but when there is nothing else to take away
Someone correct me if i am wrong but as far as i can remember there is no relationship between testing a three phase and single phase installation as the voltage should be twice the phase to ground voltage i.e for 230v PH to GRN it is 500V .
__________________
A wise person will understand more from a Foolish question than what a Fool will understand from a Wise Answer
That may be correct however, I prefer to test double the phase to phase. Of course this is also dependent upon the wire's rated voltage. If the wire isn't rated for the voltage you want to test at it will probably fail it anyways.
__________________
Perfection is achieved, not when there is nothing left to add, but when there is nothing else to take away
Most electrical codes/standards require a dielectric strength test between conductors and ground of 1000 volts plus twice the rated. So, for a 230 vac circuit one would use 1460 volts for 1 minute.
Insulation Testing Voltage
Re: Insulation testing Voltage
