Ive never been able to fully determine the intent and meaning of clause D.1 of IEC1010-1, which states:
<Circuits, other than mains circuits, that fail to comply for CLEARANCE and CREEPAGE DISTANCE may be accepted, if compliance is achieved under the fault conditions described in 4.4 and if HAZARDOUS LIVE parts are not accessible after a fault.> Suppose I have a double insulation system which relies on both supplementary insulation and basic values of creepage and clearance (C&C) to keep the operator safe from hazardous live (non-mains) conductors. Couldnt I invoke D.1 to permit me to make my C&Cs as small as I want, thereby effectively reducing my entire insulation system to that of basic levels? Am I completely missing the meaning of D.1, and if so, can anybody explain the intent and ramifications of this clause? Regards, John Quinlan quinl...@voicenet.com
