Fuses - again

When were load sensors added? Given electric windows have been around for a long long time, if not so long on UK cars.

So how does the motor know if it is friction or ice or whatever rather than a child's neck?

Early Rolls Royce windows stopped just short of closed. You had to press a second button to close it fully. To avoid trapped fingers. That was so inconvenient it was discontinued.

luminaires are

It surely does.

It means exploding glass is a risk.

Thousands of amps can flow through such leads.

no, it's to prevent the lightbulb exploding.

NT

I've seen many

I did

they aren't, they just cost more than a bit of thin wire

Some things are opinion, some things change over time. Yes of course there are lamps with cheaper fusing, and as the article says lamps with no fusing.

You may have noticed that candle and globe lamps are often not expensive.

NT

My memory is fuzzy on this but weren't there tv ads saying when to use 3 vs 13A? I also remember seeing lists, but I don't recall where

NT

I thought that nowadays you have to hold the button down to close the power window. Only opening goes all the way down with one press.

There used to be a lot of creative workarounds, some with zero regard for safety.

NT

Did you put prongs onto the foil or wrap it round an open fuse in a mains plug then measure? The latter would give lower R

NT

Back in the early '90s I think.

Like I said, at least one of the early overrides was by a separate button, but later repeated pressing would do it. The system doesn't know what's in the way, but it does know that you have realised that the load sensor has stopped the window and you have taken further action to override it.

Yes. I can see that would be an annoyance.

SteveW

No, my Zafira B has auto closing on all windows.

SteveW

Depends on the car.

My latest is auto all the way in both directions

about 1 1/4 inches for each test. I was just interested in the resiatnce rather than the other (can't remmeber what it's called) but I have been asked in the past for a resestivity meter, which is what yuo call it if your measuring the resistance of a cube of something from one surface to another.

yes just one pair for special use only with our

In reality I couldn't be bothered getting the kelin leads from the padlocked cupboard.

I also prefer to use the same kit as the students, because it means I understand better what they have to use and how.

Not by those that know what they are talking about.

Luminaires are the complete lighting unit. So yuo can have a luminaires with 6 bulbs but NOT a bulb with 6 luminaires.

Which won't affect my CU.

I've had 3 CFC's blow my 5 amp fuse in the lighing ring, and the lights went out with a bang. won't be buying them again, 3 for a fiver not worth the hassle.

I know it can, but it doesn;t really happen in reality for enough time to worry about.

Maybe that's why I have a 500 amp fuse here.

yes I lnow but not every lightbulb, if that was the case why not have such a fuse in the CU.

My first test I used our standard meter probes that were suppl.ied woith our default~£30 meters,

Agilent U1731C meter and used the supplied lead with small croc clips which looks like this

So did my last three cars.

heh

Not much. Shouldn't affect your record collection either.

most of us won't be buying CFLs again. It's 2020.

Of course it does, that's why CU MCBs & incomer fuses have the breaking capacity they do.

there is a fuse in the CU, or an MCB.

NT

If you ever get round to wrapping a dead fuse with the foil paper & fitting it into a plug you'll get lower R readings.

NT

Of course but that low reading is only true if/when testing at low voltage and current. The foil is only on one side too. I do not think that this foil paper could pass 13 amps.

it won't be much different when warm, but it will be much different when wrapped round a dead fuse.

I'm sure it could, but not sure for how long.

NT

Yup, that's the general idea... In most countries the option to protect the flex at less than 16A is not usually available, so specifying the maximum earth loop impedance of the lead is all you can do. Hence why

(whether actually true for some of the more dubious ebay tat etc is another mater)