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mmayfield
Joined: 09 Oct 2009
Posts: 40
Location: NSW Central Coast, Australia
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 Posted: Sat Jul 26, 2014 6:54 pm Post subject: Schematic symbol |
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OK, I give in. I've looked everywhere for a schematic symbol for a switch-breaker. I have every type of switch known to humankind, and standard circuit breakers, but not a switch-breaker.
Any clues, or is it just drawn like a standard circuit breaker?
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jluckey(at)pacbell.net
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| Posted: Sat Jul 26, 2014 10:11 pm Post subject: Schematic symbol |
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Mike,
I'm not aware of any special symbol for a switch/circuit breaker. I would use the standard breaker symbol. Whether or not it is used as the normal operating switch is probably not germane at the schematic level. What is important is that it can protect the wire, so show it as a standard breaker.
-Jeff
On Saturday, July 26, 2014 8:09 PM, mmayfield <mmayfield(at)ozemail.com.au> wrote:
--> AeroElectric-List message posted by: "mmayfield" <mmayfield(at)ozemail.com.au (mmayfield(at)ozemail.com.au)>
OK, I give in. I've looked everywhere for a schematic symbol for a switch-breaker. I have every type of switch known to humankind, and standard circuit breakers, but not a switch-breaker.
Any clues, or is it just drawn like a standard circuit breaker?
--------
Mike
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p="http://www.matronics.com/Navigator?AeroElectric-List" target="_blank">htnbsp; -Matt Dralle,tribution" =======
[quote][b]
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michaelagarmon(at)gmail.c
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| Posted: Sun Jul 27, 2014 4:51 am Post subject: Schematic symbol |
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Mike,
I have used this symbol. I believe I found it in the "The Aeroelectric Connection" on page 1-10 in Figure 1-13.
-Michael Garmon
On Sat, Jul 26, 2014 at 9:54 PM, mmayfield <mmayfield(at)ozemail.com.au (mmayfield(at)ozemail.com.au)> wrote:
| Quote: | --> AeroElectric-List message posted by: "mmayfield" <mmayfield(at)ozemail.com.au (mmayfield(at)ozemail.com.au)>
OK, I give in. I've looked everywhere for a schematic symbol for a switch-breaker. I have every type of switch known to humankind, and standard circuit breakers, but not a switch-breaker.
Any clues, or is it just drawn like a standard circuit breaker?
--------
Mike
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=427390#427390
===========
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ric-List" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
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k">http://forums.matronics.com
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     -Matt Dralle, List Admin.
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nuckolls.bob(at)aeroelect
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| Posted: Sun Jul 27, 2014 7:38 am Post subject: Schematic symbol |
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At 07:49 AM 7/27/2014, you wrote:
| Quote: | Mike,
I have used this symbol. I believe I found it in the "The Aeroelectric Connection" on page 1-10 in Figure 1-13.
-Michael Garmon
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I don't think there is any 'industry recognized' symbol
unique to this device so as Mike has noted, I made one
up. If you're doing AutoCAD drawings, the symbol is
included in the library of symbols on the website.
I recall a few years back that there was no 'industy
recognized' symbol for the DPDT-ON-ON-ON toggle switch.
At least not in the 'approved' mil-spec symbology
that had been adopted by Cessna. One such switch was
used in an autopilot installation I had to write about.
I crafted a symbol not unlike those found in the
'Connection publications today. Got a bucket of flack
from my super and was told to use the symbol for a
DP3T ON-OFF-ON . . . which happened to be the way that
ARC Radio supplied the schematic to us!.
"But boss!", sez I. "That doesn't help me explain
how it works to my readers. "Don't you never mind
son . . . it's ARC's product and we'll treat them
with respect." "Oh," sez I. "Okay". I had to write
a bunch of words explaining how the switch functioned
in the system hoping that my words would over-ride
the 'jump off the page' misunderstanding that was
published in the drawing.
A few years later, alternators started finding their
way onto our airplanes, the great DC Master Switch
Conundrum rose up whereupon the split-rocker was born. Hmmm . . .
how to show THAT thing on a drawing?
One of the guys over in the electrical group came
up with this:
[img]cid:.0[/img]
Push the bottom switch to ON and it forces the
top switch ON too. But with both on, you can turn
the bottom switch OFF and leave the top switch
ON. "Cool" thinks I. "A schematic symbol that COMMUNICATES
functionality with little if any head-scratching
on the part of the observer." Guess what? THAT
switch wasn't in the mil-specs either . . . but
the guy heading up the electrical group understood
the value of jump-off-the-page understanding
better than my boss . . . who was in the business
of publishing.
The point to be taken away from this missive and
Jeff's comment is that what ever symbol you do use
should first NOT CONFUSE any future readers of
your work product. After that, speak (or draw)
to operational nuances in ways that jump-off-the-
page at you.
I've seen breakers depicted thusly on various
drawings over the years
[img]cid:.1[/img]
and all three of these pictures 'make sense'
when more than one style appears in the same
publication. It helps when either a table of
symbols or accompanying text speaks to
the existence of more than one style of breaker
in the system . . . but as Jeff points out, were
you to use ANY of the three to speak to the
ELECTRICAL functionality of any circuit breaker
in a schematic, no valuable information
is lost. Adding the little nuances to depict
MECHANICAL operation is just icing on the
cupcake.
Bottom line is, make a drawing that YOU
understand first but keeping in mind that
it may be useful that somebody else understands
it in the future.
Bob . . .
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mmayfield
Joined: 09 Oct 2009
Posts: 40
Location: NSW Central Coast, Australia
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| Posted: Mon Jul 28, 2014 1:38 am Post subject: Re: Schematic symbol |
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Ah thanks Mike. I could've sworn I looked at every schematic in the AEC library but must've missed it.
Yes Bob, that's the exact reason I want a different symbol for it. I have mainly conventional breakers however I also have 2 switch breakers which power a couple of low-cycle non flight-critical system circuits. I want to make sure the circuit diagram accurately represents the system components for the benefit of anyone who may happen to be working on it other than myself.
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Mon Jul 28, 2014 7:11 am Post subject: Re: Schematic symbol |
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There really are standards for this sort of thing; many many standards. Ugh...
See: http://symbols.radicasoftware.com/category/Circuit-Breakers.html
But you'd do almost as good drawing a little box with a label in it.
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Eric M. Jones
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(508) 764-2072
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