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 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. 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