Hi, I am trying to find out how to interpret the short-circuit protection requirements of GR-1089 Section 9.8.1 R9-20 amended by Issue ID:1089-9.
1. Are the very short traces connecting IC's and discrete components pins to high current power planes required to survive a short at the components pins end? 2. If adequate current limiting can not be provided at the backplane level, is it acceptable to place the current limiting device on the circuit pack when the connector power pin or the trace connecting the power pin to the current limiting device can not handle the backplane current? 3. Similarly to the above question, is it acceptable that a few components associated with the active current limiting circuit of a circuit pack be powered by connector pins and traces that would not handle the backplane current? 4. If multiple low current connector pins are used in parallel to connect the power between a backplane and a circuit pack, is it acceptable that each pin be not able to handle the backplane current individually? Thanks in advance for your collaboration, Éric =================================== Éric Meunier Architecte de conformité / Conformity Architect E-mail: mailto:[email protected] Teknor Applicom Inc. 616, rue Curé-Boivin Boisbriand, Québec Canada, J7G 2A7 Tel: 1-450-437-4661 ext. 419 Fax: 1-450-437-8053 Web: http://www.teknor.com
