Gregg brings up a good point. I haven't followed all of this thread and I hope I'm not repeating someone else; but, just in case:
Some of the things necessary to comply with the standards have less to do with
safety than they do with compliance to the standard.
Or in some cases the safety implications are less obvious.
At a previous place of employment, in these cases we called them Compliance
Critical Components. Unfortunately this was often easier to get through the
management gauntlet that a Safety Critical Component. If management could not
see the safety implications (or didn't buy into the rationale) they would not
buy into the term "Safety Critical". When we told them that third party
approval would not be obtained unless this requirement was met, they basically
had to acquiesce and accept it. It was from this understanding that we coined
the term "Compliance Critical Component"
It was a cop-out but it got the job done. You just have to be careful and not
overuse the term.
Oscar
Please note that this case in not representative of my current
employer/management.
These opinions are mine and are in no way to be construed to represent those of
my employer.
"Gregg Kervill" <gkervill%eu-link....@interlock.lexmark.com> on 10/30/2001
11:25:48 PM
Please respond to "Gregg Kervill" <gkervill%eu-link....@interlock.lexmark.com>
To: "'Doug McKean'" <dmckean%corp.auspex....@interlock.lexmark.com>,
emc-pstc%majordomo.ieee....@interlock.lexmark.com
cc: (bcc: Oscar Overton/Lex/Lexmark)
Subject: RE: Definition for Safety Critical Component
Sorry the change to HTML was necessary to format the table.
Critical Components will including Paint (colour of the product), Labels and
Instructions. There can be no definitive answer - hazards are in the eye of
the beholder.
The following is a good starting point - use the similarity rule to identify
pneumatic and other products that store or control energy - electrical
connectors - securing clips for hoses....
REMEMBER that safety devices that OPEN pneumatic pressure can create worse
hazards that they prevent.
G
IEC
or European Component Standard
UL94 Flammability Standard
Component
Possible Operator-Service warning
94-V2
Air Filter
Y
Mains Capacitors
Stored Charge
Y
CRT's
Stored Charge
Y
Circuit Breakers
Y
Conductive Coatings
Y
Connectors
Y
Transformers and PSU
Y
UL Recognised
Fans above 30 V
UL Recognised
low power fans
94 VW1
Fibre optic cable
Eye Damage
Y
Fuses and Fuse holders
Replacement
Y
Safety Switches
Y
Line filters
Lithium Batteries
Replacement - disposal instructions
Y
Mains connectors
UL94-various
ALL Plastic Parts
Y
Power cords and Mains Cables
Y
Mains voltage motors
UL94-V1
Printed Circuit boards
Y
Relays in safety applications or switching hazardous voltages
Y
Products using primary power
Y
Switches in safety applications or switching hazardous voltages
Isolate before removing cover
Y
Transient voltage surge suppressers
Y
Thermal controls
Min - Maximum
Y
External cables
UL94-VW1
Internal equipment wiring
Eurolink Ltd. -One Link-199 Countries
P.O. Box 310
Reedville, Virginia 22539
Phone: (804) 453-3141
Fax: (804) 453-9039
Web: www.eu-link.com
-----Original Message-----
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Doug McKean
Sent: Tuesday, October 30, 2001 6:43 PM
To: emc-p...@majordomo.ieee.org
Subject: Re: Definition for Safety Critical Component
Definition for Safety Critical ComponentI'll add to Richard's
definition by saying a "Safety Critical Component"
is a component necessary for the safety approval of the product.
It's a component that prevents a person (end user or service person)
from being exposed to a hazardous condition either during
normal operation or from a fault.
- Doug McKean
-------------------------------------------
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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.
Sorry the change to HTML was necessary to format the table.
Critical Components will including Paint (colour of the
product), Labels and Instructions. There can be no definitive answer - hazards
are in the eye of the beholder.
The following is a good starting point -
use the similarity rule to identify pneumatic and other products that store or
control energy - electrical connectors - securing clips for
hoses....
REMEMBER that safety devices that OPEN pneumatic pressure can
create worse hazards that they prevent.
G
|
IEC
or European Component Standard |
UL94 Flammability Standard |
Component |
Possible Operator-Service warning |
|
|
|
|
|
|
|
94-V2 |
Air Filter |
|
|
Y |
|
Mains Capacitors |
Stored Charge |
|
Y |
|
CRT's |
Stored Charge |
|
Y |
|
Circuit Breakers |
|
|
|
Y |
Conductive Coatings |
|
|
Y |
|
Connectors |
|
|
Y |
|
Transformers and PSU |
|
|
Y |
UL Recognised |
Fans above 30 V |
|
|
|
UL Recognised |
low power fans |
|
|
|
94 VW1 |
Fibre optic cable |
Eye Damage |
|
Y |
|
Fuses and Fuse holders |
Replacement |
|
Y |
|
Safety Switches |
|
|
Y |
|
Line filters |
|
|
|
|
Lithium Batteries |
Replacement - disposal instructions |
|
Y |
|
Mains connectors |
|
|
|
UL94-various |
ALL Plastic Parts |
|
|
Y |
|
Power cords and Mains Cables |
|
|
Y |
|
Mains voltage motors |
|
|
|
UL94-V1 |
Printed Circuit boards |
|
|
Y |
|
Relays in safety applications or switching hazardous voltages |
|
|
Y |
|
Products using primary power |
|
|
Y |
|
Switches in safety applications or switching hazardous voltages |
Isolate before removing cover |
|
Y |
|
Transient voltage surge suppressers |
|
|
Y |
|
Thermal controls |
Min - Maximum |
|
Y |
|
External cables |
|
|
|
UL94-VW1 |
Internal equipment wiring |
|
Eurolink
Ltd. -One Link-199 Countries
P.O. Box 310
Reedville, Virginia
22539
Phone: (804) 453-3141
Fax: (804)
453-9039
Web: www.eu-link.com
-----Original
Message-----
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On
Behalf Of Doug McKean
Sent: Tuesday, October 30, 2001 6:43 PM
To:
emc-p...@majordomo.ieee.org
Subject: Re: Definition for Safety Critical
Component
Definition for Safety Critical ComponentI'll add to
Richard's
definition by saying a "Safety Critical Component"
is a
component necessary for the safety approval of the product.
It's a component
that prevents a person (end user or service person)
from being exposed to a
hazardous condition either during
normal operation or from a fault.
-
Doug McKean
-------------------------------------------
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:
majord...@ieee.org
with the single line:
unsubscribe emc-pstc
For help, send mail to the list
administrators:
Michael
Garretson:
pstc_ad...@garretson.org
Dave
Heald
davehe...@mediaone.net
For policy questions, send mail
to:
Richard
Nute:
ri...@ieee.org
Jim
Bacher:
j.bac...@ieee.org
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.
