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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Damned Projects!
Date: Fri, 27 Dec 2024 15:02:41 +1100
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On 27/12/2024 6:29 am, Cursitor Doom wrote:
> Gentlemen,
> 
> I'm currently in the process of building a device which will shut off
> the power to a washing machine in the event of a hose failing and
> spewing water out all over the floor. This is an eventuality which has
> always caused me considerable angst, so I finally decided to do
> something about it. After all, those flimsy 'exhaust' hoses go brittle
> over time and having one split 'in action' could cause a significant
> amount of damage to the surrounding area in a very short time. Having
> something to cut the power off instantly as soon as the water hits the
> floor would be a very worthwhile addition to the utility room and
> beyond.
> I came up with a pretty simple design which I've already proven to
> work first time at the breadboarding stage. However, turning this
> concept into a practical proposition is taking *far* longer than I'd
> imagined. I am getting there, but *slowly* and was wondering whether
> other people here have the same sort of problem as I invariably do
> with these little personal projects they undertake?
> 
> Your hydrophobic pal,

The last time my hot-water tank pin-holed through and spread water all 
over the floor, the plumber that replaced the tank put a shallow 
water-catching tray underneath the new tank and put a battery-operated 
stop valve into the cold water feed. The stop valve can with a water 
sensor that sat in the tray, and turns off the cold water feed if there 
water in the tray.

It's one more thing that screams at me when it's batteries get close to 
running out, but that's less of a pain than a lot of water wrecking the 
carpet, or the parquet that replaced it.

Talk to your local plumbing supplier - it's madness to waste time on 
design when you can buy something off the shelf.

-- 
Bill Sloman, Sydney