Employer is focusing on a smaller segment of the power industry. Myself and
test equipment no longer needed are being eliminated.
Following list of safety test equipment is free to good home. Your company
provides shipping. And you must agree to incorporate the various Klingon rites
of
Has been my (anecdotal) experience that those that are refusing or delaying
pre-comp scans tend to be the younger designers and managers. And have been
associated with a project team bereft of physics that was under the management
of a young software 'engineer'.
1. Am not certain assigning
Understand that you want to avoid "full blown", but Tektronix (nee Voltech)
makes power analyzers that will probably out-last your lab. Otherwise, as you
have the code-monkey on your back, not that difficult to do using a CT or shunt
and 6.5 digit logger such as the Agilent 34970 and about 100
MIL-B-5087 is superseded by MIL-STD-464, which says
"Overpainting of structure for corrosion control prior to ensuring an
electrical bond has been
documented as the leading cause of poor or ineffective bonds."
MIL-STD-464 points to
MIL-STD-1541 - for space systems
ARP187 - electrical
Rather general questions. And a rather specific replies (at least for what
would apply to my employer's stuff). Also note that there is a renown engineer
at Microsoft that is quite intimate with the NEC - perhaps he will comment.
- allowed ground-fault current different.
-allowed bonding
Not clear what is being asked. Is context safety or purely performance? In any
case, data from in vitro tests done with the intended end-use equipment are the
'ultimate' indicator. Should include the full range of rated operating
conditions.
The SAE, IEEE, IEC, Vulcan Science Academy, and
Forgot to mention that battery impedance and internal temperature monitoring
are two parametrics oft ignored; and both may explain much weirdness with
battery performance.
Brian
-Original Message-
From: Brian O'Connell
Sent: Monday, July 30, 2018 10:31 AM
To: 'Charlie Blackham'; EMC
Thermal stuff probably came from 60065, while much of the electrical stuff
seems to have come from 60950. So someone such as Mr. Nute, TC108 et al, would
need to provide the empirical basis for these numbers for sources from external
circuits. Should be noted that 'energy' and 'power' cause
Recently talked to an actuary-type mathematician and a Dept of Agriculture
scientist. They indicated that while mean life span once incrementally
increased during 20th century USA, the available 21st century data no longer
supports any future trend of consistent and incremental increases for
Insertion of emoji, uncommon fonts from external tables, extended unicodes, etc
into on-line documents can be problematic. And ability of a word processor
running on Windoze, to find the correct table in a corporate setting, is also
problematic.
If for marketing, not much of an issue. If for a
FUS audit and certification and license costs are not necessarily able to be
distributed over a larger production number; will depend on the particular
NRTL/SCC.
For many product combinations, there is no cost efficiency for volume or for
factory consolidation for the respective 'regulatory'
is differential as well, right? I don't
understand in that context what is meant by grounding, other than the
shield(s).
Ken Javor
Phone: (256) 650-5261
> From: Brian O'Connell
> Reply-To: Brian O'Connell
> Date: Tue, 12 Jun 2018 22:36:53 +
> To:
> Conversation: [PSES] Automoti
CAN bus assumes a 'standard' 120 ohm termination for the ends of each CANL/H
twisted pair. The ISO11898-x series talks about physical layer stuff, to
include splitting the termination with caps (but have had problems with that).
LT or TI or ??? has some app notes on this subject. It emphasized
YAID [Yet Another It Depends].
Instant gratification can be had by looking at the respective TRFs for these
standards. This is a big question that is too scope-dependent. Probably more
apt to compare 62368 with 60601. And have yet to observe a 'practical' test
process at any third-party test
Long ago, when men were men, women were women, and dogs did not wear scarfs
(sometime last year), had a customer that demanded the RAR for a component
power converter, along with the complete CB test report. When this level of
detail is required, have oft determined that the intent is to either
Many NRTLs have frequent webinars on Type Tests, and many, in the past, had
offered formal classroom training. Recently, have only seen UL and Intertek
provide this. In my experience NRTL-centric training tends to be agendized (is
that a word?), and designed to teach you how to use a
The annual PSES and EMC symposiums are the premier venues for compliance
engineering. That said, the PSES symposium sessions only talk about stuff.
After the prerequisite work of setting up and qualifying a test lab separate
from the design center, one must know and have experience with Type
Depends on Security Grade requirements and where the battery is stored.
Li batteries can be used in discharge mode to -20C. Have only done one project
for this, where the battery temperature was monitored by the charger, and shut
down charge current when outside rated temperature range, but
1. See UL796, 9.1 for support of current-carrying components at specified
voltage levels.
2. See UL796, clause 9. Some test methods for DSR rating are in the UL746
series.
3. Yes for PLC, which can 'infer' CTI.
Brian
From: Vincent Lee [mailto:08e6c8d35910-dmarc-requ...@ieee.org]
Sent:
Actually, most of us on the west coast have been busy fending off a zombie
outbreak.
Members of the Orange County and San Diego PSES chapters were last seen getting
their hi-pot machines ready as first line of defense, but believe them to have
insufficient joules to be effective.
Brian
'x and/or y' is and should be logically and grammatically represented as 'x, or
y, or both' (note the comma is not used to separate dependent and independent
clauses, but is a coordinating conjunctive between two independent clauses).
The common interpretation of a logical exclusive-or
Uhhh, no, that should be 1500Vdc. Although my power source did go insane for a
few cycles where the switch had to commutate 2500V peak.
Brian
-Original Message-
From: Brian O'Connell [mailto:oconne...@tamuracorp.com]
Sent: Wednesday, April 04, 2018 10:54 AM
To: EMC-PSTC
Did a switch for 1500kVdc that required 6kV dielectric withstand. Used two sets
of two relays in series, each rated 1500V, actuated through optoisolators.
Including input and output terminals, was about 20cm x 18cm x7cm. The peak load
was 280mA, and 10mA continuous. After about 250 power
Mr. Nute,
Per IEV definition 192-10-06, fail-safe is:
"capable of preserving safety in the case of failure
Note 1 to entry: The safe conditions should be defined for the particular
application."
Per IEC62368-1, fail-safe only applies to stuff in annex K (safety interlocks).
Where the
0. An 'appliance' (white goods) and ITE have similar, but not same,
requirements for Class II and Class III equipment.
1. Unknown, and your definition is incomplete. Dependent on rating of the power
source to the Class III device. SELV output rating does not imply Class III
equipment. By
A solution in search of a statistically relevant problem? There are also some
NHTSA guidelines for local governments that offer reasonable technical
solutions for urban roadways. Perhaps the more workable and useful solution
would be an expansion of the current automotive pedestrian collision
to the CEC:
http://docketpublic.energy.ca.gov/PublicDocuments/17-BSTD-02/TN222823_20180302T105129_Kelly_Seeger_Comments_Philips_Lighting_additional_comments_on_N.pdf
Brian
-Original Message-
From: Brian O'Connell
Sent: Wednesday, February 21, 2018 2:14 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Does any 60601 collateral standard, address limits for light-source flicker; or
have any other requirements for the light-flicker frequencies emitted by a
luminaire? Have noted IEC60601-2-41 but do not have it; does it provide
light-flicker frequency limits?
Am already aware of the TLA stuff
IR and D/EW are affected differently by capacitance, tracking, and other things.
IR can be both qualitative and quantitative; that is, a measurement of the
property of the insulator, as the test conditions and levels are all defined.
IR is typically done within the rated or 'normal' operating
(but not certification
grade) power measurements.
Best Regards,
Alfred
On February 12, 2018 1:36:10 PM PST, Brian O'Connell <oconne...@tamuracorp.com>
wrote:
Will admit to having done this stuff with using microcontrollers and discrete
sequential data channels and of sufficient sampling speed,
Will admit to having done this stuff with using microcontrollers and discrete
sequential data channels and of sufficient sampling speed, but am subject to
frequent bouts of idiocy. And this was for process control, and thus not a Type
Test. Also, note that there is a difference in technique and
Pareto principle/distribution? Methinks it may be that way with all life
sciences. After having read over 200 PhD and master's papers in
agriculture/agronomy/botany, have come to the conclusion that their ilk's
intellectual toolbox are simply not equipped with adequate mathematical tools,
nor
1. IATA packing instructions 967 and 970.
2. UN category 3481 (may be other effective cats).
3. individual carrier regulations.
Brian
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Thursday, January 25, 2018 12:45 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] IATA/ICAO and U 83.3 rules
0. NEMA MW1000
1. UL1446
2. winding limits in the standard scoped per the end-use equipment.
3. winding limits per the recognized EIS being used.
4. an enamel coating is not necessarily considered insulation - reference the
scoped standards.
Brian
bpymail 2.5.9 test 2
We have had similar discussions on the automation of Type Tests. Might be worth
one's time to search the archives.
Canned code that comes with the instrument can be effective. Have use
Benchlink, and with regret, have noted that Keysight people have ruined a once
very reliable (for windoze)
Three observations.
1. would have side-effects somewhat analogous to BPL on EMC. And the up/down
rate would probably have same problems and delay as satellite internet.
2. different modality of old tech - remember the science fair projects using
laser com from bazillions years past?
3. Ted said
The ISO and IEC should develop and publish the rationale along with the release
of the standard itself. Avoid forcing the data fit an existent conjecture.
ANSI, SCC, CENELEC, etc should never harmonize a new standard without the
engineering rationale.
As for a comparative tabulations - they
ECMA TR106, but was done for 1st ed only.
Brian
From: Leo Eisner [mailto:l...@eisnersafety.com]
Sent: Tuesday, December 05, 2017 4:40 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Was there ever a comparison between IEC 60950-1 and IEC 62368-1
(current edition preferable)? And any
Typically depends on whether control-related and/or intended for direct
connected to same DC bus as control systems and/or signals connected to a
control system.
Compare your stuff to scope of requirements in ECE Regulation 10. Would also
suggest that you become familiar with Guide to Control
Is 'QVGS2' a new CCN?
Brian
From: John Allen [mailto:jral...@productsafetyinc.com]
Sent: Thursday, November 30, 2017 8:51 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Pickle
Hi,
To pass along the learning that came out of this.
A fuse did not have a tight enough
Dear member of the Land & Naval Defence Electronics Division,
Linear regulators, where the input is the output of a SMPS, are subject to the
limitations of the PSRR of the 78xx regulators; typically less than 20dB above
40kHz. Even if no SMPS, then the typical 78/79XX does little for the
Mr. Woodgate,
Is there a recently published spec for a 'typical' 230V mains impedance for the
EU? Have also noted that the source Zs in 61000-4-5 for the instrument seem
rather high. So what is the basis for 1500A interrupt rating?
For U.S., even for an artificially low-Z electronic AC source,
UL2735, and perhaps UL916
NEC (NFPA70) article 250, NFPA70E article 110.9
UL61010-1, annex F
MOVs, as a stand-alone SPD component, typically not used in equipment subject
to worse than cat II, although there some are rated for cat III (4kV surge).
Three-phase power will be at least category
'Reliable' earthing would be per construction and test requirements of the
scoped standard. Note the term "Reliable Earthing" is not defined in the IEV,
but the various earthing and bonding terms are covered. As we all know, the
earthing bond itself is supposed to be the current path for a
Also should note that a computer peripheral is allowed have the single required
reference and note to see manual. In any case, the TCB should specify markings
in your report. And the OET has issued some rulings on product marks.
Brian
-Original Message-
From: Brian O'Connell
Sent
"(c) The provisions of paragraphs (a) and (b) of this section do not apply
todigital devices exempted from the technical standards under the provisions of
§ 15.103."
And, in any case, is allowed to be in the manual. And scope of 15.19 labeling
stuff is found in 15.19(a).
Or use Jedi mind
Yes, fire-safe cigarettes required in U.S. after 2011. Canada and EU
requirements preceded the U.S. regulations.
My recently developed hood test to verify my new side panels - fire up a dry
cigar (cigars correctly stored in humidor will typically self-extinguish after
about 50 to 100 sec). No
This is a 'delegated' directive, and is analogous to administrative law in
these United States. That is, it is subordinate to and further clarifies and
adds to the primary legislation. So the RoHS directive (2011/65/EU) does not
change, but has these substances and implementation dates added.
From: Schmidt, Mark [mailto:markschm...@xrite.com]
Sent: Wednesday, September 20, 2017 7:38 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Battery Charger
Hello Group,
I am trying to understand which standard would be applicable for a single Li-on
battery charger. It would be powered by an
Believe that preservation of legacy electronic documents is very important, and
am happy to see someone attempting to preserve this stuff.
Please note that 'doc' and 'docx' are not usable standards (even where the
OOXML is supposedly per the ISO29500 format) and is ill-suited for reliable
Industry and stake-holder responses to the California Energy Commision's NPRM
for low-power mode and power factor. Some of these comments are entertaining,
and some are interesting.
Can be rather messy to track materials traceability for all critical stuff. A
better solution is to use a production site that is also subject to CIG and/or
a routine factory FUS audit, where they build from drawings that were submitted
as part of your product assessment process. Out-sourcers
Loads on Slackware box using Pale Moon browser. Is a link to a link, so
security settings for some browsers may consider it an evil redirection by
Cardassian space aliens. Not that we care, but also loads on this windoze box.
Labview. Attractive for speed of initial development. Ugly for debugging and
adding new features and 'reading' an old vi. Attractive for reliability when
used with NI hardware and some of the more common 3d party instruments. Ugly
where each version iteration of windoze and/or LV breaks your
Warning Will Robinson - Brian is not an EMC expert.
Agree with Herr Gremmen about the referencing of equipotential points - this
was critical for my employer's current chamber because it was sitting next to a
machine shop and a HALT chamber. Would suggest two or three cups of tea,
followed by
Am not certain that ICS numbers are unique to the various versions of same
standard, or if they have same ubiquity as an ISBN. You would have to ask
someone at the ISO to be certain if other than a generic classification system.
Brian
-Original Message-
From: Chuck August-McDowell
The 'first' compliance engineering symposium? Why the split from the annual
ISPCE?
Brian
-Original Message-
From: EDAS Conference Manager [mailto:h...@edas-help.com] On Behalf Of Rachel
Brockhoff
Sent: Thursday, July 13, 2017 5:32 PM
To: Brian O'Connell
Subject: [EDAS-CFP] SPCE Boston
Perhaps. But my experience has been refusal of any reasonable carrier to write
a policy for an institution where equipment does not meet code or does not bear
the mark of an NRTL. The exception for exposure to unsafe and/or non-certified
equipment typically used for engineering labs is found in
Internal company standards do not exist to solely ensure compliance with any
particular standard, so "pros and cons" are not relevant. While there is some
overlap, the two sets of requirements are not all coincident.
IEC62133, as a product safety standard, is not adequate for the scoped
http://ieeexplore.ieee.org/document/7880613/metrics
Efficacy?
Brian
-
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
.
Meanwhile, back at my more typical and mundane life of writing test reports...
Brian
-Original Message-
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Saturday, June 24, 2017 3:54 PM
To: EMC-PSTC; Brian O'Connell
Subject: Re: [PSES] Organize my standards => ISBN 13 Digit c
For a cost, the IECEE publishes group and national differences for each
combination of ‘major’ standard and the state.
For less cost, the TRF indicates, in general form, the group and national
differences that must be addressed per the report.
Building code is one of the principal drivers for
When you have bazillions of standards, the ISBN is handy as a unique identifier
(unique and/or primary key), as each version has different reference; otherwise
no other significant use. For example, an excerpt from my database:
ISBN 9780580910234 BS EN 62368-1:2014
ISBN 9782832214053 IEC
Dunno, as Canada supposedly uses the GHS, so the diamond would probably have
the Hazcom 2012 requirements, and not the NFPA/OSHA numbers. FWIW, the severity
rating numbers are reversed for NFPA701 vs HazCom2012, and there are numerous
additional pictograms for GHS.
A while back, OSHA added GHS
ISO17050-1,-2 provides a generic specification for the D of C. The directive
itself clearly indicates the scope of the requirements (to include the various
party responsibilities) for the mark and the declaration.
There is a difference between 'proof' and the basis for a presumption of
Ametek. And the imperious power of Python. All hail the emperor.
Also look at Mil Std 1275.
Brian
From: Gray, David [mailto:dg...@tuvam.com]
Sent: Wednesday, May 17, 2017 8:33 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Mil-Std-704A
Hi group, Have anyone performed Mil-Std-704A testing?
Agree with Mr. Woodgate, but there are additional problems. A good reference
for this is Mr. Perkin's presentations and articles on the subject. Current and
voltage waveforms in ground and touch Type Tests for switch-mode power supplies
are very complex; and can vary in amplitude, frequency,
29CFR1910.37 would probably be the 'root cause' for any lighting requirements
in an ANSI standard, but is incomplete and ambiguous. Therefore, henceforth,
and heretofore; per the largess of our federal government, the offering of
29CFR1926.56 is scoped for illumination of the workplace.
It
U.S. DOE 430 has the test method, which is cited for ErP stuff. 'VI' has lower
standby and higher efficiency per MEPS limits than 'V'.
Back to the OP. Type test conditions for ac mains input; that is, mains
tolerances follow.
IEC61010-1, IEC60601-1 (Cat II), IEC62368-1±10% of rating
There are other meanings for this type of notation; typically three-phase
stuff. See IEC60038 where scope is not a component power supply.
Brian
-Original Message-
From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Monday, April 10, 2017 8:39 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Dunno, as have just used the standards referenced in annex G of 62368-1, or
whatever component requirements that would be scoped per the various end-use
equipment standards. Otherwise, perhaps materials and component and test
requirements per EN62305-x or EN61643-x?
Brian
From: Scott Douglas
teria) do we apply the NFPA 79 and
the like? At what point will inspectors expect to see a different set of design
rules applied, or again, is it all voluntary how you design a product?
Thanks for the help.
The Other Brian
-Original Message-
From: Brian O'Connell [mailto:oconne...@tamuracorp
Agree vehemently, but also codified per NECA 1-2015, and the various
workmanship standards of the Vulcan Science Academy. UL508A does not do much
for 'workmanship', just materials and construction and performance. And do not
want to see a safety standard that tells me stuff has to be built
Agree, difficult to determine. This is a particular standard so the
requirements of the standard 'over-rule' test requirements that not same in
some, but not all, other standards.
Essential performance is defined by the scoped standards and the manufacturer's
analysis that defines what
"...how the part is made?" -> the manufacturing process and technique? Stuff
from the ASTM has a little of this, but are typically materials test methods
used to verify the result of the manufacturing process. Otherwise
'manufacturing' standards seem to be for the assembly of equipment. For
]
Sent: Tuesday, March 21, 2017 10:02 AM
To: Brian O'Connell
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] AC/DC power conversion and system architecture (in-rush
limiting, reliability, cabling)
Thanks for the details, Brian! I have Pressman's 3rd edition and didn't see
any significant
From: Adam Dixon [mailto:lanterna.viri...@gmail.com]
Sent: Sunday, March 19, 2017 9:59 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] AC/DC power conversion and system architecture (in-rush
limiting, reliability, cabling)
Long post from this weekend's studies I have been thinking about
Ted Eckert could probably answer this more completely, as has been rumored that
he sleeps with a copy of NFPA79 beneath pillow, and has his phone configured
where 911 auto-dials members of TC108.
Motor protection - inverse time breaker sized to 250% of FLC, see table 430.52;
but for 1/2 hp,
For the good people of the EMC Kingdom, such as the inhabitants of CISPR SC I.
Gazing into your crystal balls, any guess on OJ publication and/or national
committee harmonization with CISPR35? Will this require a 2d edition for global
adoption and whirled peas?
Thanks,
Brian
-
of that
equipment, and which can be replaced only by the same specifically designed
equipment;
Any further help from you directly or from the EMC-PSTC team on obtaining a
formal clarification is greatly appreciated.
Thanks in advance.
Regan
-Original Message-
From: Brian O'Connell
No. Only for panel materials used in the PV film, and is not a system-level
exemption. By definition, substances and materials specified in the RoHS and
REACH directives are considered harmful, so no exclusion for materials in other
stuff.
Can you offer an 'acceptable' rationale in your D of C
Autonomously-controlled windows could be a significant hazard for some of the
‘normal’ operating conditions per NHTSA.
A guestimate based on two previous submittals to VCA and other such bodies
exceeds $80 USD per vehicle.
Brian
From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com]
Vehicular audio waring is covered in UN regulation #28 and NHTSA (DOT) 812-209.
Fire alarm stuff can be found in UL1480 and CAN S525; and other stuff in
UL464A, UL1971, CAN S526; but have no direct experience with application of
these particular standards.
Brian
From: Doug Powell
Practical for you and me? Yes.
Practical for someone that has to ask? Perhaps, but probably not. One should be
on intimate terms with the TRF, understand the meaning of declarations per RED,
RoHS, etc, and be willing to compile and defend a Technical Construction File.
Brian
From: Curtis
Interesting that North America code generally has 'polarized' connectors for
Class II stuff, and all ANSI/CSA standards scoped for NFPA70/CSA C22.1 (at
least ones that for employer's products) require touch/leakage current to be
measured both L/N normal and L/N reversed.
DP input switch for
All hail the Goddess of Search. March 2019 per
https://standards.cen.eu/dyn/www/fp=204:110:0FSP_PROJECT,FSP_ORG_ID:37957,581003=10ED77AEC2D379A0A511B4BB99F861487
Brian
From: Stephen Whalen [mailto:scwha...@bellsouth.net]
Sent: Wednesday, January 18, 2017 7:17 AM
To:
:37957=1B04E3A6EA841FF02235DCA86690F765D
Brian
-Original Message-
From: Brian O'Connell
Sent: Wednesday, January 18, 2017 8:27 AM
To: 'Stephen Whalen'; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] ISO 13485-2016
All hail the Goddess of Search. March 2019 per
https://standards.cen.eu
This discussion thread referenced the automation of tests, not the acceptance
of data. This is important where three or four different tests are being run on
10 to 20 units. Test data in 'raw' engineering units from a traceable
instrument under controlled Type Test conditions is a different
Correct, so for multiple duty cycles or varying loading intervals, possible
solution would be to use windowed average (queue size based on 1/f and dT/dt
and previous sample interval) with a 'delayed' least-squares fit thru the
maxima to see if flat. [hear the ghosts of my math instructors
Rough pseudo code for my transformer algorithm for logging and monitoring
temperatures for normal operating conditions:
time constant = (material ksp * mass) / (24*60)
sample interval = time constant / (mass * material kx)
breakpoint flags = false
if sample interval < min interval
sample
Safety standards, for this subject, are dogmatic and ritualistically procedural
and do not pertain to basic principles of thermodynamics. Thermal equilibrium
requires a temporal measurements of two or three systems, where it has been
verified no heat is being transferred between the systems..
The new (U.S.) OSHA NRTL directive has been essentially harmonized with
ISO17025 and ISO17065, so the European (ECS) and OSHA factory and product
surveillance programs are now more similar than not.
While CIG 021 covers 'routine' product tests, the ECS system is not necessarily
focused on
UL's FUS is ‘designed’ to meet U.S. OSHA and/or Canada SCC factory _and_
product surveillance requirements. The specific requirements for test equipment
and product construction criteria for the FUS audit will be found in the
Section General for each respective UL file volume.
The CIG (023 is
Ahem, please forgive me NFPA, for I have sinned...
Wired the 120V service to my shop building in ring topology. Single 240V/40A
breaker to the ring where enters building, and each 20A outlet has a 12A 'T'
hi-break line fuse. The only hi-X load is small drill press, so no motor issues.
The 240V
Not aware of any ‘centralized’ database, but some vendors (future, avnet, etc)
routinely issue PCNs that cover the major component suppliers. This seems to
catch most of these product announcements for me.
Brian
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Tuesday, December 06, 2016
You would need to provide the specific method/procedure number. There can be
more than one humidity test. For some stuff there can be significant latitude
in test method, depending on the LCEP.
Brian
From: Gary McInturff [mailto:gary.mcintu...@esterline.com]
Sent: Wednesday, November 09, 2016
LMAO….
There was great consternation of the human suitability for control of vehicular
machinery upon the increasing popularity of automobiles.
For most of these contrived situations, the bottom line is the machine would
probably make a better decision than a human. And a machine would be less
Transformers that "don't need a fuse" need an 'inherently limited' assessment
per UL5085-3/CSA No.66.3 and/or IEC61558-2-6.
Limits based on load current are correct where NEC article 725 is scoped, as it
becomes a wiring issue. For North America, the limits would be defined in CSA
No.223 and
If the transformer is a 'certified' component, what are its ratings and
conditions of acceptability?
Do the connected circuits in the end-use equipment have a required interrupt
rating?
What article of the code is being applied?
Per admin law, Field assessment only done by a NRTL or AHJ. Any
1. Review the requirements and standards for secondary batteries referenced in
the safety standard(s) scoped by your end-use equipment.
2. Review UN packaging and transport standards and regulations for Li batteries.
3. Understand that EN62133 is a minimalist approach to battery safety.
4.
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