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In the US Power plug: designations:
NEMA = "National Electrical Manufacturers Assoc"
If the number starts with an "L" it is a
"twistlock"
The next number is the configuration followed by a
"-" and then the amperage rating of the plug.
Last is ther grounding designation.
NEMA 5 means conventional US 125 vac between neutral centre tap
of the
utility trasnsformer and one end of the 220 vac of the utility
transformer.
NEMA 6 means both ends of the 220 vac without the centre tap
Nema 14 means both ends of the 220vac AND the neutral centre tap.
The standard grounded 125 vac plug in the USA is a "NEMA
5-15 ground"
formulae.html
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