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On 22/01/2019 15:19, whisky-dave wrote:
On Tuesday, 22 January 2019 14:09:15 UTC, Dave Plowman (News) wrote:
In article ,
alan_m wrote:
On 22/01/2019 08:55, Jim GM4DHJ ... wrote:
do you think the merrycan way of switching with down off is more sensibubble
that what we do in the uk ?




Two way switching uses both conventions.


Up/down os probably only really seen with older tooggle knobs on
switches. Most of us probably use sockets/switches where pressing the
lower part is on and pressing the upper part is off.


At one time, Crabtree sockets had their rocker switch flush when off.
Raised on. Which meant bashing it with a chair leg or whatever meant it
could only be switched off. Seemed quite sensible to me.


Is this why hospitals tend to have sockets without a switch so they can't accidently be switched off


I have made a number of visits to hospitals recently - including one
last night. The sockets were all switched.

The ones last night were ones where the rocker is flush when off and one
set (maybe on an uninterruptible supply?) had red rockers.

SteveW
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Default Lonely Psychotic Senile Ozzie Troll Alert! LOL

On Wed, 23 Jan 2019 05:50:24 +1100, cantankerous trolling geezer Rot Speed,
the auto-contradicting senile sociopath, blabbered, again:

Green chillies tend to be hotter than red ones,


That¢s bull****.
https://pepperhead.com/top-10-worlds-hottest-peppers/


You quickly looked it up again, just to be able to continue with your
notorious smartassing, you lonely abnormal senile cretin! LOL

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On 22/01/2019 20:50, Steve Walker wrote:

It is a lot easier in the nuclear that I have seen and worked on, as
they have used a clear, standard document and so no-one is in doubt.
Still has to be run past Human Factors for confirmation though.


Ah human factors.
I was once told by the "experts" at human factors that a switch had to
be operated with a gloved hand in arctic conditions and the protruding
type of toggle switch knob was preferred.

Later when speaking to the military personnel who actually had to use
the equipment they forcefully suggested that it was the wrong type of
switch knob. In vehicles every piece of equipment can be a step to get
in/out and a size 10 army boot and protruding toggle knob don't mix and
it snaps off. Even with hand held equipment the protruding knob is
vulnerable to snapping off in battlefield conditions.


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On 22/01/2019 21:04, Steve Walker wrote:

Probably more to do with Red being conventionally for warnings and
prohibitions, while Green is for informative items.


At one time every power on indicator on electronic equipment was neon
and usually red. These days with consumer electronics the favoured
colour seems to be blue and implemented with an eye burning laser!


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On Wed, 23 Jan 2019 00:15:52 +0000, alan_m wrote:

On 22/01/2019 21:04, Steve Walker wrote:

Probably more to do with Red being conventionally for warnings and
prohibitions, while Green is for informative items.


At one time every power on indicator on electronic equipment was neon
and usually red. These days with consumer electronics the favoured
colour seems to be blue and implemented with an eye burning laser!


Yes, I have a KVM right here that is like that. Thin layer of Blu-Tak
dims it nicely.



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On Tuesday, 22 January 2019 21:07:38 UTC, Steve Walker wrote:
On 22/01/2019 15:19, whisky-dave wrote:
On Tuesday, 22 January 2019 14:09:15 UTC, Dave Plowman (News) wrote:
In article ,
alan_m wrote:
On 22/01/2019 08:55, Jim GM4DHJ ... wrote:
do you think the merrycan way of switching with down off is more sensibubble
that what we do in the uk ?




Two way switching uses both conventions.

Up/down os probably only really seen with older tooggle knobs on
switches. Most of us probably use sockets/switches where pressing the
lower part is on and pressing the upper part is off.

At one time, Crabtree sockets had their rocker switch flush when off.
Raised on. Which meant bashing it with a chair leg or whatever meant it
could only be switched off. Seemed quite sensible to me.


Is this why hospitals tend to have sockets without a switch so they can't accidently be switched off


I have made a number of visits to hospitals recently - including one
last night. The sockets were all switched.


Did they have gas lights too. ?



The ones last night were ones where the rocker is flush when off and one
set (maybe on an uninterruptible supply?) had red rockers.

SteveW


The one I saw in the new section at whipps cross didn't have any switches.


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On 23/01/2019 00:15, alan_m wrote:
On 22/01/2019 21:04, Steve Walker wrote:

Probably more to do with Red being conventionally for warnings and
prohibitions, while Green is for informative items.


At one time every power on indicator on electronic equipment was neon
and usually red. These days with consumer electronics the favoured
colour seems to be blue and implemented with an eye burning laser!


Blue LEDs are more "modern" as they weren't available (at least
affordably) a decade or so ago. (Nobel prize winning too.)

Some have green for on and red for standby, often in the same component.

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On Wednesday, 23 January 2019 12:36:32 UTC, Max Demian wrote:
On 23/01/2019 00:15, alan_m wrote:
On 22/01/2019 21:04, Steve Walker wrote:

Probably more to do with Red being conventionally for warnings and
prohibitions, while Green is for informative items.


At one time every power on indicator on electronic equipment was neon
and usually red. These days with consumer electronics the favoured
colour seems to be blue and implemented with an eye burning laser!


Blue LEDs are more "modern" as they weren't available (at least
affordably) a decade or so ago. (Nobel prize winning too.)

Some have green for on and red for standby, often in the same component.


One of those bi-sexual LEDs or is gender neutral the proper term ;-)
You can get rainbow ones too. :-)

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On 22/01/2019 20:50, Steve Walker wrote:
On 22/01/2019 13:14, newshound wrote:
On 22/01/2019 12:43, Steve Walker wrote:
On 22/01/2019 10:41, alan_m wrote:
On 22/01/2019 08:55, Jim GM4DHJ ... wrote:
do you think the merrycan way of switching with down off is more
sensibubble
that what we do in the uk ?




Two way switching uses both conventions.

Up/down os probably only really seen with older tooggle knobs on
switches. Most of us probably use sockets/switches where pressing
the lower part is on and pressing the upper part is off.

I once worked on a rack of equipment where the (military) customer
specified that a big red illuminated front panel light meant the
power to the electronics was off! Guess how much damage was caused
to plug in boards that didn't like to be hot plugged?

I have worked on designs for many oil and gas/chemicals companies.
Most have wanted a green light for say a pump running ok and red for
stopped or failed, but some wanted the reverse, as they reasoned red
for energised and green for deenergised and therefore safer. A few
even wanted a mix, with green being for fail-closed valves that were
in the open position and for fail-open valves in the closed position,
thus showing their energisation rather than their positions.

SteveW


I worked on a (nuclear) project with a lot of C&I in the noughties,
the designers initial design followed the green for good, red for bad
convention. However, when the mandatory Human Factors specialist came
in she insisted that only white lights were used.


It is a lot easier in the nuclear that I have seen and worked on, as
they have used a clear, standard document and so no-one is in doubt.
Still has to be run past Human Factors for confirmation though.

SteveW


My project started about 2002, I was the custodian of project standards
for a while and I don't recall having one for instrumentation displays.
But the mandatory HF overview was a relatively new thing at the time. It
was a fairly novel and complex project, the first level was the physical
engineering, the second was the electrical and mechanical interlocks to
trap and recover from various faults, and it was only as this became
firmed up that it was possible to start thinking about displays. The
first design would have come from the hardware guys to help the people
preparing the documentation and safety cases, knowing that it would have
to pass a formal HF review. Believe me, it was a lot more user friendly
than the original 1950's hardware that it replaced. IIRC one of the old
procedures required the operator to count 43 turns of a hand-wheel.
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