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tech / sci.electronics.design / Re: Why do circuit breakers go up for on and down for off?

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

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

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Subject: Re: Why do circuit breakers go up for on and down for off?
From: gnuarm.d...@gmail.com (Ricky)
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 by: Ricky - Mon, 13 Feb 2023 03:33 UTC

On Saturday, February 11, 2023 at 8:01:08 AM UTC-4, Carlos E.R. wrote:
> On 2023-02-11 10:00, Commander Kinsey wrote:
> > On Sat, 11 Feb 2023 08:48:06 -0000, Colin Bignell
> > <c...@bignellremovethis.me.uk> wrote:
> >
> >> On 11/02/2023 08:16, Commander Kinsey wrote:
> >>> Why do circuit breakers go up for on and down for off?
> >>
> >> It goes back to the early days of electricity, when knife switches were
> >> used in distribution boards. They had no spring to hold them in place,
> >> so gravity would pull them down and it took an intentional action to
> >> move them up. It was considered that meant it was safer for down to be
> >> off and up to be on.
> >
> > But in a domestic setting they replaced fuses, which didn't have a
> > switch. In a domestic setting, lightswitches and switches for
> > appliances are all down for on.
> Not here. They are random.

They can be installed upside down. But then the writing is upside down making the ON switch a NO switch.

> > Volume on a stereo
> > is louder to the right and quieter to the left.
> That's because logarithmic potentiometers are used, and the
> manufacturers make them in one direction only.
> > You tighten a screw by turning it to the right.
> It would be a mess manufacturing both directions. But reverse screws do
> exist.

Nearly everything in my car goes to 11.

--

Rick C.

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