It matches perfectly the permitted touch current for double insulated appliances (0.5 mA) for a supply voltage U0 of 500 V.
But why would we then apply the same value to a 230V installation?
Or indeed to only part of an installation - as I recall, the 1MΩ limit is for one DB and its outgoing circuits (with all appliances disconnected, even fixed ones).
- Andy.
Does the insulation resistance test refer to the stress voltage generated at twice the nominal single phase voltage to earth? The importance being that its electrically stressing the insulation?
It matches perfectly the permitted touch current for double insulated appliances (0.5 mA) for a supply voltage U0 of 500 V.
But why would we then apply the same value to a 230V installation?
Or indeed to only part of an installation - as I recall, the 1MΩ limit is for one DB and its outgoing circuits (with all appliances disconnected, even fixed ones).
- Andy.
Does the insulation resistance test refer to the stress voltage generated at twice the nominal single phase voltage to earth? The importance being that its electrically stressing the insulation?
