Is it not also true that you don't have to follow the derating if you are using a single-outlet circuit (ie the breaker only supplies one single outlet)? I thought I remembered that being the case, but I can't quote chapter and verse.
To add to the list of weird (yet NRTL marked) cables; what about a C13 to C20 (or C14 to C19) jumper? I can see cases where this is justifiable, but it just feels wrong: https://www.stayonline.com/power-iec-c20-c13-cords.aspx https://www.stayonline.com/iec-c14-to-c19-15-amp.aspx -Ken A On Mon, Oct 9, 2017 at 12:24 PM, Ted Eckert < [email protected]> wrote: > 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:[email protected]] > *Sent:* Monday, October 9, 2017 8:31 AM > *To:* [email protected] > *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. > > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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