Hi James:
Understanding the basic physics and rationale of the safety standards
requires reverse engineering of the requirements. And an understanding of
the people (and their biases) that wrote the standard. Very difficult.
And, the safety standards are not necessarily in agreement with each other.
For example, one would think that electric shock requirements are
independent of the type of equipment, but they are not. (In my opinion, we
should have a safety standard that addresses electric shock rather than
equipment.)
60664-1 is largely based on research by Stimper. 60479 is largely based on
research by Biegelmeier. 60990 has a good bibliography, although some of
the references have been ignored.
I would recommend the following sources:
"Electrical Product Compliance and Safety Engineering," by Steli
Loznen, Constantin Bolintineau, and Jan Swart. ISBN 13: 978-1-63081-011-5.
Papers presented at the annual IEEE Product Safety Engineering
Society "International Symposium on Product Compliance Engineering," 2004 to
2022.
Join one or more national committees addressing product safety
standards.
IEC Technical Committee documents.
UL "Bulletins of Research." No longer available from UL, but
may be in some technical libraries.
Articles by Charles Dalziel.
Books by Dr. Vyto Babrauskas, Ph.D. (Dr. Fire.)
Product Safety Newsletter, Product Safety Engineering
Newsletter.
"Electrical Shock Safety Criteria," Proceedings of the First
International Symposium on Electrical Shock Safety Criteria
1st Edition - January 1, 1985. Editors: J.E. Bridges, G.L. Ford, I.A.
Sherman. eBook ISBN: 9781483162201
With regard to electrically-caused fire in 62368-1, the PIS requirements
come from 60065 and Ernst Storm (deceased). The 15-watt requirement came
from me based on ignition tests.
Thermal burns are not due to object temperature, but skin temperature.
Standards requirements are object temperature.
Have fun! Best wishes for the holiday season,
Rich
From: James Pawson (U3C) <ja...@unit3compliance.co.uk>
Sent: Wednesday, December 7, 2022 5:07 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Electrical Safety - Fundamental Standards and Concepts
Hello experts,
My goal is to put together a reading and reference list of fundamental
standards that help me understand the basic physics and rationale behind the
requirements in safety standards (mainly EN 62368-1, EN 61010-1, EN
60335-1).
I've been finding a lot of useful references from the Normative References
sections of these standards and from the IEC TR 62368-2 explanatory notes.
In your opinion, what standards should I add to this list to expand my
knowledge of electrical safety?
Thanks in advance
James
General Terminology
<https://www.electropedia.org/> IEC 60050 IEV "Electropedia" although this
is sometimes lacking
Electric shock
IEC 60664-1 "Insulation coordination for equipment within low voltage supply
systems - Part 1: Principles, requirements and tests"
IEC 60990-1 "Methods of measurement of touch current and protective
conductor current"
IEC 60479 series shock current on humans and livestock
IEC 61201 Touch voltage limits
Electrically caused fire
Power source classification in 62368-1 references IEC 60065 and IEC 60950-1.
But where did they derive their information from? What are the power levels
based on?
UL 94 and UL 1581 for material and cable flammability
Thermal Burn
Basic standards detailing risks of touch temperatures ISO 13732-1 and IEC
Guide 117
Other?
Radiation
IEC 62471 "Photobiological safety of lamps and lamp systems"
IEC 60065 for audio levels
Other?
Mechanical hazards
???
James Pawson
Managing Director & EMC Problem Solver
Unit 3 Compliance Ltd
EMC : Environmental & Vibration : Electrical Safety : CE & UKCA :
Consultancy
<http://www.unit3compliance.co.uk/> www.unit3compliance.co.uk |
<mailto:ja...@unit3compliance.co.uk> ja...@unit3compliance.co.uk
+44(0)1274 911747 | +44(0)7811 139957
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