I have a couple of questions regarding this standard: (I have the 1992 version)
First Table 16 specifies maximum temperature RISE for components, surfaces,... What are the assumptions here? Are they assuming an ambient of room temperature (25 deg C)? Which would mean that a rubber handle could become as warm as 25 deg C + 50 deg C which is 85 deg C? This seems high to me. This would be even worse under high temperature ambients. For instance, our products are typically specified to operate in ambients up to 45 deg C. In this ambient temperature, Table 16 would appear to allow an absolute temperature of 45 deg C + 50 deg C for an absolute temperature of 95 deg C!!!!! This seems high to me. Any thoughts? Second I am planning on using high voltage hold-up capacitors in a high voltage bus application (200VDC). The capacitors are aluminum electrolytic, radial leaded, PCB mount with a safety vent. Nichicon The capacitors will be the tallest components on a PCB within a metal chassis. The metal cover going over them will be grounded. Do I need to leave a clearance distance over the top of these capacitors for the safety vent to operate? Do I need to leave a clearance between their top and the grounded cover for dielectric withstand reasons? If the grounded cover is within a few thousandths of an inch of the capacitor tops, do I need to put some kind of mylar sheet in between insulate it from the capacitors? (assuming that the cover could be bent to touch the capacitors.) Any advice would be welcomed and appreciated. adTHANKSvance. Chris Maxwell | Design Engineer - Optical Division email [email protected] | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
