FOREWORD This is an update to the NEMA white paper originally published in 1994. To ensure that a meaningful publication was being developed@ draft copies were sent to a number of groups within NEMA having an interest in this topic. Their resulting comments and suggestions provided vital input prior to final NEMA approval and resulted in a number of substantive changes in this publication. This publication will be periodically reviewed by the Molded Case Circuit Breaker Product Group of the Low Voltage Distribution Equipment Section of NEMA for any revisions necessary to keep it up to date with advancing technology. Proposed or recommended revisions should be submitted to: Senior Technical Director@ Operations National Electrical Manufacturers Association 1300 North 17th Street@ Suite 900 Rosslyn@ Virginia 22209 This white paper was developed by the Molded Case Circuit Breaker Product Group of the Low Voltage Distribution Equipment Section of NEMA. Approval of this white paper does not necessarily imply that all members of the Product Group voted for its approval or participated in its development. At the time it was approved@ the Molded Case Circuit Breaker Product Group had the following members: