Temporary circuit - max amps to faceplate?

[Midwest]

The fact that MK have recently chosen to exceed the statutory minimum requirements on their logic plus series is great, and their outlets will be safe on the 32A supply.

Others don't and, therefore, won't. It doesn't affect my opinion on the standard itself.

Just out of interest, @Elecpleb , what brand and model faceplate have you used?

So going on from that, the maths doesn't compute, for those 20A models; like those yourself given that information, how do you advise the way forward with lessor standards. do you know better than a 20A product manufacturer?

 

[Lucien Nunes]

Split that 4200W likely max load across two different double sockets.As others have said, the faceplate may only be tested to 20A across both outlets.

Why? The router and dust extractor won't realisrltically

 

[Lucien Nunes]

Oops ^^, sat on my phone, which then ran out of battery.
Obviously there's no harm in splitting the load across two sockets, but it really ought to be OK on one double and one should not have to fret too much about these details in normal use.

The router won't realistically take its maximum nameplate load for more than a small fraction of the time. It will spend some time at part load, some time running light and some time switched off, within the thermal time constant of the socket parts. The socket heating depends on the time average of the square of the current, not the square of the average, and the current will exceed the rating during starts, so I'm going to take a guess at 1250W equivalent continous load. Let's assume the extractor runs continuously at full load. 1250+2200=3750W. We also have to guess the power factor. A mix of fully-loaded induction and part-loaded universal, not too bad, shall we say 0.85? 3750/0.85=4410VA. Total current on double socket 4410/230=19.2A which is within spec for any compliant BS1363 product, continuously for the expected life of the socket. I think the OP will expire from router-fatigue before the socket expires from total-combined-current-induced-heat-accelerated-deterioration!

 

[littlespark]

And @Lucien Nunes wins again!

 

[pc1966]

No, I was questioning what had been impressed upon me, which was that a current up to 32A at the rear of the faceplate could cause issue.

No, due to the plug's fuses (13A or less).

Cooker outlets often have 40-50A supplies and a single 13A socket for a kettle.

That is the advantage of the UK system: you can have a lot of sockets on a high current supply (ring or radial, depending on your religious persuasion) and it is perfectly safe.

The only issue discussed above is that a 2*13A socket is often rated only at 20A combined, hence it is better in kitchens with a couple of high power appliances to have a few more single outlets than doubles.

But none of that has any bearing on the supply rating (so long as it is not under long-term overload due to being too small).

 

[Spoon]

And @Lucien Nunes wins again!

Doesn't he always.. He's a hero...

 

[Lucien Nunes]

Credit for any useful answers I give is usually due to the people who worked out the laws of physics in the first place. I just bring them along to the conversation (the laws of physics, not the old guys.)

 

[goasis]

No, I was questioning what had been impressed upon me, which was that a current up to 32A at the rear of the faceplate could cause issue.

Your only going to get 32a at the socket if you put a load on it that draws 32a. Anything plugged into that socket will be "protected" by a plug top fuse of 13A or less. Same as many circuits in many houses.