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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: The Natural Philosopher <tnp@invalid.invalid> Newsgroups: comp.os.linux.misc,alt.os.linux.mint Subject: Re: smart plugs??? Date: Sat, 18 Jan 2025 11:25:44 +0000 Organization: A little, after lunch Lines: 38 Message-ID: <vmg33o$ofht$18@dont-email.me> References: <vm8nvf$312bv$1@dont-email.me> <vmatqg$3gi7d$1@dont-email.me> <vmb1c7$3grs4$1@dont-email.me> <vme1k3$4c4v$2@dont-email.me> <vmf37b$cr46$2@dont-email.me> <lv1h31Fkkq1U4@mid.individual.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sat, 18 Jan 2025 12:25:44 +0100 (CET) Injection-Info: dont-email.me; posting-host="edf12cc82be1478ca0a3ef223552910d"; logging-data="802365"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18EuqxiYqGbcys08eoTkAqW6dxw79o10yM=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:mdEF8YwDHtwJVU0fjvWx4YLAlfk= Content-Language: en-GB In-Reply-To: <lv1h31Fkkq1U4@mid.individual.net> Bytes: 2496 On 18/01/2025 11:19, Andy Burns wrote: > Lawrence D'Oliveiro wrote: > >> Mike Scott wrote: >> >>> I'm looking at probably 3kW at 240V to run a heater. >>> The power level is just a bit outside my comfort zone for home >>> construction ... >> >> I should say it is. It’s well beyond the rating for a typical household >> outlet. > > No, it's exactly the limit of a UK 13A socket (assuming the nominal > 230V, in practice most will be above 240V) but they do tend to suffer > when used with long running at full load (poor contact -> high > resistance -> heating -> charring -> fire) > >> Whatever it is, I imagine you’re going to need professional >> electrician help to set it up. > > I wouldn't trust a smart switch on a long-term load such as an immersion > heater, there are 20A versions, I think I'd prefer using a smart switch > to drive a chunkier contactor and hardwired terminals. > Well I have yet to code up my board that has a simple 20A relay. I'd probably use a GTO thyristor with an opto-coupler than a contactor. It's cheaper -- "Anyone who believes that the laws of physics are mere social conventions is invited to try transgressing those conventions from the windows of my apartment. (I live on the twenty-first floor.) " Alan Sokal