Here is a summary of capacitor discharge situations with late adds:
Operator conditions: Vacuum tube radio/tv with isolated metal trim. (John Woodgate) Service conditions: Vacuum tube radar servo controller. (Doug Powell) Service conditions: UPS capacitor discharge (automatic or time delay) before servicing. (Bansi Patel) Operator conditions: Defibrillator automatic discharge. (Dave Osborn) Operator conditions: CRT capacitance. (Mike Sherman) (Dan Roman) Service conditions: Power factor correction capacitor for motor drives (Ted Eckert) (Julia Curson) (Mike Sherman) Service conditions: Small ion implanters. (Lauren Crane) Service conditions: Microwave oven capacitors with integrated bleeders. (Adam Dixon) Service conditions: Electrostatic speaker amplifiers. (Adam Dixon) Service conditions: Electric welding systems. (Adam Dixon) Service conditions: Industrial laser systems. (Inadvertently omitted from first list).) (Pete Perkins) Adam (in Atlanta) Dixon sent a URL of a capacitor discharge event that is worthwhile reading. Note the picture of the capacitor! https://ehs.berkeley.edu/lessons-learned/lesson-learned-injury-caused-high-voltage-capacitor-discharge We still need to identify in our safety standards when a charged capacitance requires a safeguard. For operator conditions, we need automatic discharge as is done for defibrillators. For service conditions, we need either an automatic discharge safeguard or an instructional safeguard. (We can ignore vacuum tube devices and crt devices as it is doubtful any new products will use such devices!) Thanks for your responses. Stay safe! Rich - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org <mailto:emc-p...@ieee.org> > All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com> > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
