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In Reply to: RE: Great picture illustrations. posted by jea48 on February 20, 2015 at 07:45:58
The only obvious thing about the matter is an IEC inlet has the same polarity orientation as an AC outlet, but I don't see why that would be important since one type of connector interface is a power inlet, while the other type of connector interface is a power outlet, which would make better sense in terms of safety if the polarities were purposefully reversed in order. Furthermore, the reason why a cable-mount IEC connector has the same order of polarity as a cable-mount AC plug seems pointless and counter-intuitive. The only important aspect of a cable-mount IEC connector is that the electrical contacts are shrouded for safety, which should negate any safety requirement of which prong should be for live, and which one should be for neutral. Which is to say, the reasonable idea would be to feature a different polarity orientation for an AC power inlet vs. that of an AC power outlet.
Follow Ups:
Hi Duster,Thanks for responding to my post.
See the link below.
Note the polarity of the inlet panel mount plug. It is reverse that of the IEC inlet plug. Again the inventor of the IEC connector who set the wiring configuration standard for IEC connectors could have just as easily matched the NEMA configuration standards beings NEMA standards were in existence way longer, I believe, before the IEC connector was thought of.
You would have to admit it would be easier to make-up, wire, the female IEC connector to a cord like you showed in your picture had the inventor of the IEC connectors reversed the hot and neutral contacts polarity. You would not have to cross the hot and neutral wires over one another, not to mention it would have matched the existing NEMA standards.
I realize things are going to stay the way they are. LOL, no turning back now... I only wondered what the guy was thinking when he set the configuration standard for the IEC connector.
Note, the inlet plug in the link below is quite commonly used on portable food warming equipment used in hospitals and such. Though I would have to say twist lock panel mount plugs are quite common as well.Jim
Edits: 02/22/15 02/22/15
The specialty inlet you point to has the opposite polarity orientation as an IEC inlet does. The powers that be were thinking smart that time, indeed.
BTW, thanks for keeping AA forums informed about NEMA and other issues of AC code and safety over the years. I for one appreciate it.
Cheers, Duster
Duster,
Thank you for the kind words.
Jim
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