Eric, My interpretation of the standard is that the grounding conductor needs to be able to handle the sum of the currents. If both the supplies are fed from a common supply, e.g. -48V, then they should both be included in the calculation. Regards, Dave Spencer Compliance Engineer Oresis Communications
-----Original Message----- From: "Meunier, Éric" [mailto:[email protected]] Sent: Tuesday, March 14, 2000 4:24 PM To: [email protected] Subject: Grouding conductor fault current Hi, With regards to the GR1089 requirement for a grounding conductor to safely conduct fault currents "likely to be imposed" (Section 9.7.1, R9-10 [82]): Do we have to consider that multiple independent outputs of an embedded power source (ex: 5V and 3.3V) may be shorted simultaneously, or can we assume that only one would be shorted at a time? Best Regards, Eric =================================== 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
