Wombat:
What is the science behind the 1 MOhm minimum insulation resistance? What is the basis for this particular value?
Wombat:
What is the science behind the 1 MOhm minimum insulation resistance? What is the basis for this particular value?
original requirement was based on a fraction of the total load the installation was to be loaded with.
AJJewsbury:
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.
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