Recently? I recall 110V at our house in Philadelphia, but that was 60
years ago. Going back to Westinghouse and his AC transformers I did
read they were 110V output. With voltage drops at distances it could be
low and thus, was boosted to a nominal 120V.
I am neither an electrical historian or engineer and I'm not going to
search for cites. Nominal voltage today is 120 but can be lower with
On Thursday, September 22, 2016 at 7:05:18 PM UTC-4, Ed Pawlowski wrote:
That's all we're talking about, nominal voltage that the power company
supplies today for the OP's oven and similar. Which again is why I
asked if anyone has seen 110V in the USA and that's today, not in 1942.
In my world it's 120/240V. And it does make a difference. If I saw
110V at my panel, I'd know something isn't right.
This discussion is almost like trying to call a 2x4 whatever it is now.
Over the years the 2x4 has gotten smaller as the time passes by. The
voltage has gotten higher. If you were to go to a lumber yard would you
ask for a 2x4 or maybe something like a 1 3/4 x 3 1/2 or whatever they
are now ?
I have a voltmeter on one of the outlets at my house that stays on all
the time. It has been calibrated with instruments that were at one time
set to the NIST. It has ranged from a low of 118 to a high of 124 at
the times I have seen it. Most of the time it is around 121 to 123
On Thursday, September 22, 2016 at 11:14:28 PM UTC-4, Ralph Mowery wrote:
Not even close to the same. 2x4's are called out as that in construction
specs, though the actual dimensions are less. That is what they are referred to by standards, by sellers, by buyers, by people in the trade,
who call them 2x4s but deliver the spec'd dimensions. You just saw
the specs for the oven in this thread. It says 240V, not 220. Same with
my oven when I put it in. The applicances one typically buys are spec'd
at 120V, not 110V. And 120V is what the power company delivers, again
to a spec. In other words the industry is using 240/120, mostly
consistently and that is what you get when you measure at the panel,
at least here. So, I don't see the need for the 110/220 confusion,
it's just wrong.
Exactly. It's not in the neighborhood of 110V, because it's 120V power.
Like many things, it (110V referral, that is) hangs around because at
one time it _was_ the standard and not all the people who grew up with
it died off at the time it was changed and, besides, they had kids and
those kids learned to call it what their folks did, and that continues
to this day...what the actual is isn't really the issue or the cause
either one; it's simply historical precedent.
IIRC, converting RMS to peak, you multiply by the square root of 2 (I
don't know why it's THAT). 120 * SQR(2) = 169.7056275, which most people
would call 170. I needed to know that recently when selecting a diode
(1N4003) for making a light half brightness.
I recently was talking to an older friend who was talking about a
submersible well pump that uses 220. I've always said 240 for that.
Also, I have measured the voltage here, and have almost exactly 120 and 240.
BTW, when doing the above math I remember by first class in
trigonometry. Most of the time, the teacher was walking around showing
people what buttons to press on their calculators. Then they would be
asked for something like "the SIN of 80" and some student would read all
8 or more digits of the answer. There was almost nothing said about what
trigonometry IS or what it could be used for.
93 days until the winter celebration (Sunday December 25, 2016 12:00:00
AM for 1 day).
When I took trig we did not have to worry about the buttons to push. It
was either a slide rule or look them up in the CRC book.
For most electrical/electronic work 3 digits raised to whatever power of
10 was needed was about all that was ever needed. Most of the
components were only 10 % few were 5 % and very few 1 % except for the
That is a major problem with the way mathematics is taught. Not only
does it lead to incomplete understanding of it, it hides the usefulness
When I was in school we weren't allowed to use calculators. One teacher
I had would allow us to use a slide-rule if we knew how to work one.
US spec's are given in ANSI C84.1-2011; you may be surprised to lean
that first standardized effort by AIEE occurred as far back as 1898 the
first joint meetings were held with the first accepted for publication
in June, 1899. Revisions to it occurred in 1902, 1905 and 1911. The AC
low voltage ratings at that time were established as 110,220,440 and 550 V.
I don't have the full history between then and the initial C84.1
adoption in (I believe) 1956 but as the Wikipedia article notes, there
were intermediary periods of voltages between 110 and the current 120.
Some history-type papers I've seen had data that by the late 1940s
something like 90% of produced light bulbs were rated for 120V.
A link to the C84.1 Table 1
I showed an old phonograph motor to my Electricity & Electronics
instructor back in 1970. It had a clear plastic strap around it with
110VAC in black stamped on it. He told me it was about twenty years old
because back in 1950 or so 110 volts was the norm.
On Thursday, September 22, 2016 at 8:56:34 PM UTC-4, Diesel wrote:
Well what should one assume, when it's a 240V oven being connected
to a 240V service and you start talking about 220V? Why confuse
people who don't even know how to hook up their oven, by using
a voltage convention that is wrong and does not exist?
On Tue, 20 Sep 2016 16:29:11 -0700 (PDT), trader_4
I just bought a wall oven and the ones I looked at were listed for a
20a circuit. I ended up with a GE 27" convection oven that spec's out
I think you will find the 40a circuits are for ranges tho. Wall ovens
and cooktops are 20a or 30a.
On Wednesday, September 21, 2016 at 2:05:38 AM UTC-4, firstname.lastname@example.org wrote:
I was thinking from what I have hear. The house originally had a
Jenn-Air combo oven and microwave wall unit. I recently replaced it
with a Kitchenaid double 30" unit. Both of those were 40A, which
was fortunate so I didn't have to rewire. I can see a single oven
would use less, IDK what the OP has, but he is saying that in the
manual it says a 40A circuit, while those other numbers he posted
would seem to show 22A, so IDK.
replying to trader_4, Tony944 wrote:
Well I am not surprise that you never seen 220, however there are many places
that power is must likely to be around 208 instead of 240 or 220. in most
metropolitan area you are lucky to have even 208 I have been in places with
power was low as 195 and customer complain why equipment is not working right
"In metropolitan areas" (apartments etc) you may actually be looking
at 2 legs of a 120/208 3p service
If you have less than 216v (240 minus 10%) at your meter on a 120/240
1p service you should be calling the Public Utilities Commission or
whomever regulates your PoCo. (if the power company will not do
anything about it when you tell them)
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