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Subject: Re: Electrical Conductor Spacing

Date: 11/06/01 at 2:50 AM
Posted by: D I Hammond
E-mail: dhammond@mtl-inst.com
Message Posted:

In Reply to: Electrical Conductor Spacing posted by Francis LHeureux on 10/16/01 at 1:13 PM:


The creepage distance is dependant on the
comparative tracking index (CTI) of the printed
circuit board. Assuming that your PCB has a
CTI > 600, then referring to EN61010-1:1993 (
Safety requirements for electrical equipment for
measurement, control and laboratory use. Part 1.
General requirements), Annex D, table D.18, page
92, voltages between 3200V and 4000V should have
a creepage distance of 20mm (0.7874").

This distance is for circuits subjected to
Pollution Degree 2 (normally only non-conductive
pollution occurs. Occasionally, however, a
temporary conductivity caused by condensation
must be expected.)


D I Hammond

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