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Ot: Dishwashers
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tom66:

--- Quote from: Ian.M on January 25, 2021, 02:22:44 pm ---In the UK, if use of an electric cooker is anticipated, its usual to provide a 32A or 45A radial circuit (240V) to a dedicated connection unit via an isolator often combined with a single BS1363 socket.

See https://www.tlc-direct.co.uk/Book/6.5.2.htm

--- End quote ---

It's also common to allow this 32A oven circuit to support a 13A plug and 9kW of hobs+oven,  I think it allows up to 11kW loading on what is a 7.2kW circuit, based on the assumption that no one will use all fully loaded at once.  But my mother had her microwave connected to the cooker socket which is one of those Panasonic 3kW convection-turbo ovens (I gave her my old one) which meant the cooker circuit breaker would clatter rather loudly when she was using that at the same time as the hobs!
Ian.M:
That's why there's a trend to either *NOT* provide a 13A socket on a 32A circuit or provide a 45A circuit, which always allows up to 7.8KW 'flat-out' for the cooker (or 10.8KW if 45A with no 13A socket), and as the rings and oven are regulated, usually by 'bang-bang' controllers, its rare to have all rings and the oven element drawing current simultaneously except for a few minutes during warmup if you turn them all on at the same time.

If course if the customer isn't a penny squeezing idiot, a reputable electrician doing a new install or replacing the feed cable, will probably recommend a 45A circuit breaker and 10mm2 cable, especially if a double oven cooker is to be installed or if an isolator with auxiliary 13A socket is to be fitted.  Use a long chain of contractors where you don't even get to talk to the electrician and haggle on the price and you'll usually get the bare code compliant minimum and occasionally a deficient bodge job with a bogus certificate.
themadhippy:

--- Quote ---It's also common to allow this 32A oveOver here the dishwasher is wired to the 3-phase outlet meant for the oven circuit to support a 13A plug and 9kW of hobs+oven,
--- End quote ---

The onsite guide to  the regs  gives a figure of 15kw  if protected by a 30/32A device which fits with the diversity allowed  on a cooker circuit which is  the first 10A of the rated current plus 30% of the  remainder and another 5A if a socket is built into the cooker control unit. One quirk, which is a throwback to the days of rewirable fuses, is the  use of 6mm2 for a 32A circuit, 4mm2 on a mcb is perfectly within the regs,but if  you dare to do it  every so called expert will be calling you a cowboy
helius:
I imagine it would work if there was sufficient W/m at the resist. Traditional exposers for resist materials were "actinic" arc lamps, which have very strong peaks at 355 and 385nm. The UV-C lamps made for disinfecting (they really are not designed to sterilize) in dishwashers etc may just not be strong enough.

You can see an arc lamp exposing resist on a printing screen in the classic "To Live and Die in L.A." directed by William Friedkin.
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