Dear Pete,
Unfortunately the IEC 62368-1 language does not conform the to surge
protection terms established by the IEC surge protection subcommittees
SC 37A (Low-voltage surge protective devices) and SC 37B (Components for
low-voltage surge protection). Notice one subcommittee deals with
Devices and the other Components. What's the difference?
component: constituent part of a device which cannot be physically
divided into smaller parts without losing its particular function
(IEV 151-11-21)
device: material element or assembly of such elements intended to
perform a required function
(IEV 151-11-20)
I'm not in love with the device definition as there is nothing about
components used in creating the device. TC 77 did a better job with
device: combination of components having a given function, forming part
of a piece of equipment, apparatus, or system
IEC 61000-5-6, ed. 1.0 (2002-06)
Turning to SC 37A (Devices) the generic surge protective device
definition is
surge protective device, SPD: device that restricts the voltage of a
designated port or ports, caused by a surge, when it exceeds a
predetermined level
NOTE 1 Secondary functions may be incorporated, such as a
current-limiting to restrict a terminal current.
NOTE 2 Typically the protective circuit has at least one non-linear
voltage-limiting surge protective component.
NOTE 3 An SPD is a complete assembly, having terminals to connect to the
circuit conductors.
For those SC 37A working groups purely concerned with AC and DC power
protection the definition becomes
surge protective device, SPD: device that contains at least one
nonlinear component that is intended to limit surge voltages and divert
surge currents
NOTE An SPD is a complete assembly, having appropriate connecting means.
In both cases a surge protective device contains a surge protective
component or components that give the surge protective device its surge
protective function.
SC 37B (Components) are laggardly and have yet to produce a surge
protective component definition. For that we must look to the ITU-T and
IEEE.
surge protective component (SPC): component specifically included in a
device or equipment for the mitigation of the onward propagation of
overvoltages or overcurrents or both.
ITU-T Recommendation K.96: Surge protective components: Overview of
surge mitigation functions and technologies
surge-protective component (SPC): Component specifically included in a
device or equipment for the mitigation of the onward propagation of
overvoltages or overcurrents or both.
C62.42.0 IEEE Guide for the Application of Surge-Protective Components
in Surge-Protective Devices and Equipment Ports—Overview
Thus clear-thinking surge protection people get confused when IEC
62368-1 uses surge protective device when what is really meant is a
surge protective component (e.g. gas discharge tubes, metal-oxide
varistors, Zener diodes, avalanche diodes, punch-through diodes and
positive temperature coefficient thermistors). The correction is obvious
— replace "device" with "component".
Regards,
Mick Maytum
Safety and Telecom
Standards
mjmay...@gmail.com
https://ictsp-essays.info/
------ Original Message ------
From: "Pete Perkins" <00000061f3f32d0c-dmarc-requ...@ieee.org>
To: EMC-PSTC@listserv.ieee.org
Sent: 02/11/2017 06:04:38
Subject: Re: [PSES] Regulatory requirements for MOVs - 62368 side issues
Ralph, et al,
IEC 62368-1, the Hazard Based Standard, is developed in a way that it
is intended to provide more complete coverage of the hazards
encountered from electrical equipment in its scope and provide more
options for manufacturers in meeting those requirements (albeit this
will require looking at the details more to take advantage of some of
the benefits).
In 62368 MOVs are part of the class of Surge Protector Devices (SPDs)
for which requirements are covered in some detail as discussed in this
thread.
IN 62368 there are three levels of users for which differing
protection is provided; they are ) ordinary person, an everyday user,
perhaps your 8 yr old daughter, ) instructed person = person
instructed or supervised by a skilled person as to energy sources and
who can responsibly use equipment safeguards and precautionary
safeguards with respect those energy sources, and ) skilled person =
person with relevant education or experience to enable them to identify
hazards and to take appropriate actions to reduce the risks of injury
to themselves and others.
This differentiation seems reasonable based upon my experience.
Perhaps for TV repair you are not skilled but might be instructed; on
the other hand perhaps you are neither. Where do you fit yourself on
this scale?
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201
p.perk...@ieee.org
-
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