Brian, et al,
The answer to your question is: It depends.
It depends upon who has the place to authorize its use for such a
condition.
Ted E sez that it is not acceptable and give his reasoning.
The UL/cUL power-cord folks believe that it is acceptable by the
marking; some test houses would accept this cert without question so
the usage in a product would seem acceptable.
Who is the Supreme Arbitor on this? It seems that the AHJ Inspector
has the last word on this. Wot’s the chances that the product with
this power-cord will be field inspected in the application and accepted?
Wot’s your company business risk level on an issue such as this?
:>) 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 <mailto:p.perk...@ieee.org>
*From:*Kunde, Brian [mailto:brian_ku...@lecotc.com]
*Sent:* Monday, October 9, 2017 11:01 AM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] NEMA 5-20P with IEC 60320 C13
https://www.stayonline.com/detail.aspx?id=11844
The power cord above is as I described in my original email. It too is
UL/cUL listed. It is listed as a 15 amp power cord powered by a 20 amp
branch circuit and 18 amp conductor (cordage). Can this power cord
power a device rated 15 amps? If not, why not?
Thanks,
Brian
*From:*Pete Perkins [mailto:00000061f3f32d0c-dmarc-requ...@ieee.org]
*Sent:* Monday, October 09, 2017 1:57 PM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
*Subject:* Re: [PSES] NEMA 5-20P with IEC 60320 C13
Brian, et al,
Oh yes, strange combinations… The referenced combo is safety
certified on the mfgrs spec sheet; really strange, wot was the test
lab thinking?. Wot kind of a product would appear with a
50A/125V/250V plug on it such that one would need an adapter to use it
on a 15A/120V circuit? Would an Electrical Inspector really accept
such? It would really raise a lot of questions; wouldn’t you like to
be a ‘mouse-in-the-corner’ listening to such.
:>) 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 <mailto:p.perk...@ieee.org>
*From:*Ted Eckert [mailto:000007cf6ebeab9d-dmarc-requ...@ieee.org]
*Sent:* Monday, October 9, 2017 9:24 AM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
*Subject:* Re: [PSES] NEMA 5-20P with IEC 60320 C13
Hello Brian,
This falls under the issue of “continuous” vs. “non-continuous” loads.
NFPA 70, section 210.19 is one of the clauses that sets the
requirement for the 80% derating. However, it states: “Where a branch
circuit supplies continuous loads or any combination of continuous and
noncontinuous loads, the minimum branch-circuit conductor size shall
have an allowable ampacity not less than the noncontinuous load plus
125 percent of the continuous load.”
“Continuous” is a load intended to be used for 3 hours or more. A
hairdryer or microwave are not “continuous”. (If they are, you either
have too many dogs and need to stop walking them in the rain or you
like cooking food until it tastes like charcoal.)
The problem is that a detachable cord with an appliance coupler could
be used with any product. Unless it has a built-in timer, you have no
way of guaranteeing that it won’t be used with a product that draws
current for less than 3 hours. There may be “non-continuous” loads
with an appliance coupler and rated for 15 A. As such, I would expect
such a detachable cord to need to be rated for at least 15 A.
A cord with a NEMA 5-20P would then be prohibited from having a C13
connector at the other end. It would need a C19 instead.
That being said, for some specialty industries, you can find some
strange combinations of plugs and receptacles.
http://www.marinco.com/en/s15-504
Ted Eckert
Microsoft Corporation
The opinions expressed are my own and do not necessarily reflect those
of my employer.
*From:*Kunde, Brian [mailto:brian_ku...@lecotc.com]
*Sent:* Monday, October 9, 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
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