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
<mailto:p.perk...@ieee.org> 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
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> 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
_____
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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