Should have put a (grin) symbol in that.
I've always understood two phase to mean a
distribution system using three wires, one common,
with two conductors whose phase differed by 90
degrees. These were used, I believe, mainly for
motors. I think this is what the original question
was asking
RE: 2 Phases in North AmericaTwo Phase / 5 Wire (4 hots and a neutral) was
a common power distribution in US cities in the early part of this century.
Many early motors are 2-phase motors. I learned about this when helping
with connection of these motors to run on a 3 phase power system via a
Dear Esquire:
May I suggest that you partake in a course called Basic Electricity
001?
Bogdan.
Cortland Richmond wrote:
By the definition below, *single phase* AC would require one wire
with no return. I want to see THAT one work before I pay for it!
Cortland Richmond
(the above being my
I just checked with my attorneys (the very prestigious firm of Dewey,
Cheetum Howe)... And they figured that he may have instead been listening
to too much Beatles music pretending his fist was a silver hammer and he was
named Maxwell (WHAT? You didn't name your son after a name well known to
My guess is the line is always moving...the pit stops get determined by the
nature of the product, the environment of intended use, laws, ethics,
lawyers, knowledge, safety professionals, cost and schedule. A likely
vehicle towards the education of the end user would be the user
documentation.
Actually, 2 phase systems have a phase rotation of 90 degrees, not 180.
Two phase systems have been used for control motors and the like, but
are fairly rare these days. 180 degree rotation between phases is a
center tapped single phase system. The proper terminology is, I
believe, split phase.
Bob,
Here you will find a few more surprising (maybe not) misuses.
http://www.electrical-contractor.net/Y-Files.htm
Let me repeat an invitation to any that would like to participate in our
Forums.
We would love to have some product safety related individuals involved
and perhaps some of our
Stephen (or is it Moe?)
You miss the point. None of the catastrophes you present below are presented
in the news in a humorous (except, perhaps, in the case of politicians) or
positive manner. Children especially, and some adults as well, will accept
things literarily, especially when
I hope you didn't let him watch the news either...
he could become a murderer, drunk driver, rapist,
embezzler, adulterer, car thief, or politician... or one
of those guys who goes surfing in a hurricane. Or -
learn by what he saw, not by what he didn't see.
With all due respect,
Moe
Gert,
You may be technically correct, but I also believe that we should bring up
citizens to be prudently knowledgeable about electrical hazards. These are
not intuitively obvious. The manufacturer has a responsibility for designing
a safe product. The user has a responsibility for using
Hello all,
Today it came to my attention the IEC website in Japan is down. I checked
with InterNIC and their domain name is no longer registered. I checked with
GOOGLE.COM and search results are:
-
Graphical Symbols Compliant to IEC Standard 417 -
By the definition below, *single phase* AC would require one wire with
no return. I want to see THAT one work before I pay for it!
Cortland Richmond
(the above being my own opinion, not a statement of my employer's)
Robert Johnson wrote:
This
has just reopened the old two phase controversy
This is the soda machine test. It enables frustrated consumers to freely
bounce the machine without killing themselves. There was a news report
several years ago about the macho army guy at Ft. Carson Army base who was
killed by a filled pop machine when he didn't get his proper change.
I no longer have a copy of the 5th edition but from your email, I suggest
that the equipment must be both floor standing and have a mass exceeding
20kg. Why do you reference the 5th edition, this has long been superceded
by the 6th edition and the 7th edition has also just been released.
Best
RE: Enclosed OATS facilities---detourHi
On the subject of OATS, I need to get one set up in the UK.
Can any one recommend a company that will install an compliant OATS in the UK?
Regards Darren
Darren Pearson
Radio Telecom Approval Services
Genesys
Singleton Court, Wonastow Road
Richard,
* If the test methods you are using are harmonized to the RTTE Directive
then you do not need a Notified Body.
* If the frequency you are using is harmonized by all EU countries then you
do not need the Alert symbol (exclamation point in a circle).
1. Harmonized test methods and
This has just reopened the old two phase controversy again. Ed has done
a good job of describing the systems in detail, but be careful with the
terms.
Ask an electrical engineer about a 120/240 volt home service and he will
call it a two phase system. Two phases 180 degrees out of phase is
{ Please read this email with more then average sense of humour , and then :
THINK !)
So, What's Wrong With That,
The guy on the picture (see link below) is protected by 2 layers of safety:
1/ Basic Insulation, rated for the mains voltage PLUS transient levels
2/ Grounding , for in case the
Hi Group
I HAVE A QUSETION REGARDING STABILITY QUESTION
In IEC60065 5TH EDITION+A1+A2+A3 Subclause 19
Appartus designed to stand on the floor and having a mass exceeding 20 kg
shall have adequate stability.
How to understand this clause?
one understand
this subclause applies to the appartus
-Original Message-
From: Barry Esmore [mailto:bar...@melbpc.org.au]
Sent: Thursday, December 13, 2001 2:39 PM
To: EMC-PSTC Forum
Subject: 2 Phases in North America
Hi All,
Can someone provide an estimate of the percentage of homes and businesses
that have 2 phases in Canada and the
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