David Chisnall (*Now with 50% more sarcasm!*)Oct 23
Whoever came up with the design of taps used in a load of plumbing that rotate 90° and are open when they are in line with the pipe and closed when they are across is a usability genius. I have no idea who it was, but it's one of the most obvious designs (for a user to understand, I make no claims about the implmenetation) that I've ever encountered. Absolutely brilliant.
Show threadGraham PerrinOct 23

@david_chisnall

For mains power, I can never remember which icon means On, which icon means Off, because both icons are O-shaped.

Does the O with a line in it represent On?

I hope so, because your plumbing observation seems relevant.

Please tell me that my decades of confusion have come to an end.

Show threadabrasive

@grahamperrin There is a standard for these symbols but unfortunately some of them weren't thought through terribly well...

The circle ⭘ always means OFF
The bar ⏽ always means ON
The bar fully enclosed in a circle ⏼ means ON/OFF where the control alternates between fully on and off
And the bad one is the bar poking through the circle ⏻ which is for standby (IEC 60417) *or* power (IEC 1621) and could do almost anything

Oct 23 at 9:00pmWeb
Show threadGraham PerrinOct 23

@abrasive thanks!

At first sight, I'll never interpret the circle as anything other than the letter O.

I will remember that it's electrically off when the red or blue handle is turned ninety degrees – away from the pipe – for the hot or cold water to not get through.

Laughable, but true. Finally, I have found a way to remember what's what. What?

#electrical #on #off #water #plumbing #red #blue #hot #cold