original requirement was based on a fraction of the total load the installation was to be loaded with.
That sounds like the old Electricity Supply Regulations - they permitted a maximum leakage of one ten thousandth part of the installation's max demand. (e.g. 10mA for a 100A single phase supply). I'm struggling to equate that to 1 MΩ though.
Earlier regs did have various different ways of calculating the IR limit - often based on the number of points.
- Andy.
That sounds right.
Back when I did the 16th Edition Regs course the figure was given as 1 Mohm with a recommendation for 2 Mohm, because the JPEL committee and HSE agreed to disagree. (IET 1 HSE 2)
original requirement was based on a fraction of the total load the installation was to be loaded with.
That sounds like the old Electricity Supply Regulations - they permitted a maximum leakage of one ten thousandth part of the installation's max demand. (e.g. 10mA for a 100A single phase supply). I'm struggling to equate that to 1 MΩ though.
Earlier regs did have various different ways of calculating the IR limit - often based on the number of points.
- Andy.
That sounds right.
Back when I did the 16th Edition Regs course the figure was given as 1 Mohm with a recommendation for 2 Mohm, because the JPEL committee and HSE agreed to disagree. (IET 1 HSE 2)
