Re: Why do circuit breakers go up for on and down for off?

From	"Carlos E.R." <robin_listas@es.invalid>
Newsgroups	uk.d-i-y, alt.home.repair, sci.electronics.design
Subject	Re: Why do circuit breakers go up for on and down for off?
Date	2023-05-13 03:53 +0200
Message-ID	<d673jjxrll.ln2@Telcontar.valinor> (permalink)
References	(19 earlier) <u3guv8$pu30$1@dont-email.me> <mgdtijxq2f.ln2@Telcontar.valinor> <u3h4is$qlgg$1@dont-email.me> <u3lg65$8s7$2@gonzo.revmaps.no-ip.org> <u3mm97$1rqor$1@dont-email.me>

Cross-posted to 3 groups.

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On 2023-05-13 02:40, Paul wrote:
> On 5/12/2023 9:49 AM, Jasen Betts wrote:
>> On 2023-05-10, SteveW <steve@walker-family.me.uk> wrote:
>>> On 10/05/2023 22:04, Carlos E.R. wrote:
>>>> On 2023-05-10 22:31, Bob F wrote:
>>>>> On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote:
>>>>>> rbowman wrote on 3/12/2023 10:05 PM:
>>>>>>> On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote:
>>>>>>>
>>>>>>>> On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> Why were they never made of something more grippy than highly
>>>>>>>>>> polished
>>>>>>>>>> steel?
>>>>>>>>> https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway
>>>>>>>> Should be used on all tracks, then perhaps trains could stop in the
>>>>>>>> distance my car is required to by law.
>>>>>>> Do the math. A fully laden coal car weighs about 140 tons. I've
>>>>>>> never been
>>>>>>> bored enough to count cars when I stopped at a crossing but there 
>>>>>>> are a
>>>>>>> lot of them. Let's say 30 for the sake of argument, 4200 tons 
>>>>>>> plus the
>>>>>>> weight of the engines. Let's say 4 at 200 tons each. So, roughly
>>>>>>> 5000 tons
>>>>>>> traveling at 50 mph. That's quite a bit of kinetic energy to dump in
>>>>>>> 300'.
>>>>>>> I can hear snapping axles and see flying wheels.
>>>>>>
>>>>>>
>>>>>> The wheels and the rails are steel. A train can never have enough
>>>>>> friction to stop at a short distance. The brakes can lock all the
>>>>>> wheels but the train will still move forward due to inertia.
>>>>>
>>>>> All that need is train wheels made of rubber as hard as steel.
>>>>
>>>> If you do that, then those wheels will be very low friction and braking
>>>> will be as bad as with steel wheels.
>>>>
>>>> You need something that is soft to increase the contact surface and
>>>> grip. You have to choose, one thing or the other. Can't have both.
>>>
>>> Well you could have a train having steel wheels, but with rubber tyred
>>> wheels that could be dropped onto the track during heavy acceleration,
>>> heavy braking and for steep hills. But generally, steel wheels work well
>>> enough.
>>
>> If they need extra traction they drop sand on the tracks.
>>
> 
> Having one derailment per day, is a testament to the
> technical sophistication of rail.

Only in the USA.


-- 
Cheers, Carlos.

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Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-10 13:31 -0700
  Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-10 23:04 +0200
    Re: Why do circuit breakers go up for on and down for off? SteveW <steve@walker-family.me.uk> - 2023-05-10 23:07 +0100
      Re: Why do circuit breakers go up for on and down for off? Fredxx <fredxx@spam.uk> - 2023-05-11 01:19 +0100
        Re: Why do circuit breakers go up for on and down for off? Tim W <nospam@example.com> - 2023-05-11 09:31 +0000
          Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-11 14:19 +0200
            Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-11 06:48 -0700
      Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-10 19:09 -0700
      Re: Why do circuit breakers go up for on and down for off? Jasen Betts <usenet@revmaps.no-ip.org> - 2023-05-12 13:49 +0000
        Re: Why do circuit breakers go up for on and down for off? Paul <nospam@needed.invalid> - 2023-05-12 20:40 -0400
          Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-13 01:34 +0000
            Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-13 09:26 +0200
            Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-13 07:25 -0700
              Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-13 19:08 +0000
                Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-13 12:39 -0700
                Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-14 02:49 +0000
                ATM cloned cards + Dumps 101,201,WU transfer and paypal transfer George Walker <gw448684@gmail.com> - 2023-05-13 20:41 -0700
                Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-14 09:47 +0200
                Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-14 06:48 -0700
                Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-14 18:12 +0000
                Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-14 11:45 -0700
                Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-14 21:38 +0000
                Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-14 23:45 +0200
                Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-14 14:54 -0700
                Re: Why do circuit breakers go up for on and down for off? "Rod Speed" <rod.speed.aaa@gmail.com> - 2023-05-15 11:50 +1000
                Re: Lonely Obnoxious Cantankerous Auto-contradicting Senile Ozzie Troll Alert! Peeler <trolltrap@valid.invalid> - 2023-05-15 10:10 +0200
                Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-14 21:03 +0200
                Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-13 23:39 +0200
          Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-13 03:53 +0200
            Re: Why do circuit breakers go up for on and down for off? Paul <nospam@needed.invalid> - 2023-05-13 03:31 -0400
              Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-13 21:14 +0000
                Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-13 23:41 +0200
        Re: Why do circuit breakers go up for on and down for off? Sam Plusnet <not@home.com> - 2023-05-13 20:25 +0100

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