Sujet : Re: smart plugs???
De : tnp (at) *nospam* invalid.invalid (The Natural Philosopher)
Groupes : comp.os.linux.misc alt.os.linux.mintDate : 18. Jan 2025, 12:25:44
Autres entêtes
Organisation : A little, after lunch
Message-ID : <vmg33o$ofht$18@dont-email.me>
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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