Yes, it could be difficult to change to respecting the rated values, so
how about respecting the de-rated values instead? Instead of saying that
you can only use this 20 A connector up to 16 A, call it a 16 A connector?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-10-10 21:57, Ted Eckert wrote:
The various clauses of NFPA 70 are reviewed, challenged, debated,
argued and rewritten. I don’t think the clause in question remains
because nobody has challenged it. Part of the issue is that the
electrical infrastructure in the U.S. has been developed around this
rule. If affects circuit breaker trip curves, conduit fill, wire sizes
and rating and many other aspects of a building’s electrical system.
If the rule were changed, would there be problems switching over?
Would you have overheating in older structures where circuit breakers
were replaced without updating wiring? Wold there be other effects of
mixing 80% and 100% rated components? How many U.S. national standards
would need to be updated?
It is a poor analogy, but think about switching sides that you drive
on the road. Sweden switched on September 3, 1967. Street signs,
traffic signals and road markings all had to be changed. Headlights
had to be adjusted or re-aimed. For quite a while, there was a mix of
left-hand and right-hand drive cars. It was a massive undertaking for
a country with fewer people than either London or New York City.
Changing the way branch circuits are rated in the U.S. could be done,
but it would be an extremely complicated undertaking. The risks of a
mismatch of circuits, circuit protection and loads would be
significant for a long time. I suspect that by the time the technology
evolved to the point where the requirement could be eliminated, it was
too late and eliminating it would result in too much expense and rework.
Ted Eckert
Microsoft Corporation
The opinions expressed are my own and do not necessarily reflect those
of my employer.
*From:*John Woodgate [mailto:j...@woodjohn.uk]
*Sent:* Tuesday, October 10, 2017 12:49 PM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] NEMA 5-20P with IEC 60320 C13
Well, yes, because the IEC tends to believe that rated values are
realistic and do not need to be adjusted downwards. I suspect that at
some point in the distant past (maybe even nearly 100 years ago), some
connectors in wide use were found to overheat at rated current, so the
'derating rule' was brought in, and no-one has challenged it since.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associateswww.woodjohn.uk
<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.woodjohn.uk&data=02%7C01%7Cted.eckert%40microsoft.com%7Cb9a5abba70d24e2f093e08d51018031b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636432617679408094&sdata=jNpj%2FFhCHx9ir37o7Xf5GxovOe2h0nU9FIZnbo5mItE%3D&reserved=0>
Rayleigh, Essex UK
On 2017-10-10 20:12, Ralph McDiarmid wrote:
The NEC (NFPA 70) talks about “continuous currents” and when to apply the
all-too-familiar 125% rule. Canadian Electric Code (CSA part I) has same
requirement. The IEC seems to have avoided it.
Ralph McDiarmid
Product Compliance
Engineering
Solar Business
Schneider Electric
D 604-422-2622
From: Kunde, Brian [mailto:brian_ku...@lecotc.com]
Sent: Monday, October 09, 2017 8:31 AM
To:EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: [PSES] NEMA 5-20P with IEC 60320 C13
It is my understanding that according to the US National Electric Code, 15
amp receptacle are derated to 12 amps max., and 20 amp receptacles are derated
to 16 amps.
IEC 60320 C13 connectors are rated 15 amps in North America. Do I derate
them as well or can I draw 15 amps continuous from the C13 connector?
So here is the big question:
If I have a power cord with a NEMA-5-20P at one end, IEC 60320 C13 at the
other end, and 14awg cordage (rated 18A), can I use/ship this power cord with a
product rated 15 amps?
Thanks to all.
The Other Brian
________________________________________
LECO Corporation Notice: This communication may contain confidential
information intended for the named recipient(s) only. If you received this by
mistake, please destroy it and notify us of the error. Thank you.
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