Hi Amund, Let me expand a bit on the answer James Pawson gave.
Skilled personnel have the training and skill to both identify hazards and know how to protect themselves from those hazards. Let me start with an electric shock example. A licensed electrician should know how to determine what the highest voltages in a system will be and where they will be located. That person should know what personal protective equipment, tools, and procedures are required to safely work with that equipment. They are trained on how to deenergize and lock out equipment, and where necessary, work with energized equipment. What training would you give somebody to look at a system and identify creepage and clearance distances below the minimum specified in the safety standard? What protection would a skilled person use to protect themselves? Reduced spacings can create arc and fire risks, and these can present a hazard to not only the personnel working with the equipment, but anybody in the area. If reduction of levels of safety creates a fire risk, does it pose a hazard to others? IEC 62368-1 lists the different energy classes for thermal hazards, electrical shock, radiation hazards, etc. However, some attributes, such as spacing and selection of flammability ratings of materials do not have those three energy classes. There are fixed requirements. These requirements must be met as they protect from hazards that training of personnel would not necessarily provide protection. Ted Eckert The opinions expressed are my own and do not necessarily reflect those of my employer or IEC TC 108. ________________________________ From: Amund Westin <[email protected]> Sent: Monday, November 11, 2024 10:20 PM To: [email protected] <[email protected]> Subject: [EXTERNAL] [PSES] Safeguard - Skilled person IEC TR 62368-2:2019:, Ch.4.3.4 “Safeguards for protection of a skilled person”, table 1: Skilled persons require 0 safeguard to Class 3 energy source. Does this requirement make influence on the creepage and clearance distances? BR Amund ________________________________ 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 [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe)<https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected]<mailto:[email protected]> Rick Linford at: [email protected]<mailto:[email protected]> For policy questions, send mail to: Jim Bacher at: [email protected]<mailto:[email protected]> ________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 - ---------------------------------------------------------------- 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 [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
