Consider the insulation construction for an external interconecting cable
connected to secondary hazardous circuits of ITE (EN60950). Is it
permissible for the reinforced insulation to be constructed of two layers
(e.g., conductor insulation plus external jacket) if the total thickness is
at least 0.4 mm? Clause 2.2.1 appears to allow it; however, clause 2.9.4.2
appears to indicate that layered insulation can only be used internally. 

Richard Woods
Sensormatic Electronics
Tyco International


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