krw wrote:
In article BNjhi.51$DM4.37@trndny06, says...
"N Cook" wrote in message
...
Rich Grise wrote in message
news On Thu, 28 Jun 2007 07:45:50 +0100, N Cook wrote:
Could someone direct me to pics of the 2 different types of plug/socket
system used in the USA to differentiate for medium and high power use,
I
didn't even realise 220 or 240V was used residentially anywhere in the
USA.
http://www.voltec-industries.com/nema_chart.html
https://www.hubbellnet.com/max_htm/t...EMA/front.html
http://nooutage.com/nema_configurations.htm

Hope This Helps!
Rich

Helps ?
It must be easier learning Japanese than learning to differentiate all
that
lot and then ominously on top of that sections marked "Reserved for Future
Configurations"
Is it subsets of that lot for each state or each utility company or a
total
mish-mash ?


There's about 3 different types of receptacles you'll find in a US
residence, the rest on that list are either industrial stuff or obsolete
things you might find in the occasional 1950s or earlier house. Generally
you'll find mostly 15A 120V grounded types, then the clothes dryer will have
a 30A 240V receptacle and the kitchen stove will have a 50A 240V receptacle.
Other high powered items like an electric furnace, water heater, spa, etc
will be hard wired. Sometimes you'll find a 15 or 20A 240V receptacle in the
garage for something like an air compressor or small arc welder but these
are generally added by the homeowner. It's really not very complicated.

There are also outlets used for room air conditioners. I have a 120V
15/20A outlet by one window downstairs and a 240V 20A (IIRC) outlet
for the thru-the-wall AC. Stoves and clothes dryers may also have
either a three pin ungrounded or four pin grounded outlet.
I know the UK has a number of plugs and receptacles in the same category,
I've got a small pile of various oddballs from over there right here.

In addition, there are at least a couple of different 240v outlets used
for clothes dryers. In fact that's one appliance commonly supplied
'minus' a cord...the appropriate one being fitted at time of installation.

jak