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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
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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