Fuses : Plug fuses to BS 1362. скачать в хорошем качестве

Fuses : Plug fuses to BS 1362.

Here we are then. The first in a line of 'Fuse' videos. To start with, let's look at the range of BS 1362 plug-top fuses that are available. A lot of people only know of the 3A and 13A fuse ( in what I refer to as a 'dumbing-down' of BS 1362! ) and as such, it is said that if an appliance is less than 720w, you give it a 3A fuse and if it's over that wattage..... well hey, you give it a 13A fuse! Easy, eh? Exactly. It's a dumbing-down of BS 1362. Don't fall for it, peoples!! Now, there are a few people that also know of the 5A fuse. This fuse seems to be getting rarer in use and not seen too much anymore. Years ago, things that would have used a 5A fuse would have been a 1kW electric fire or heater, a small over-sink 1kW water heater, or even a hair dryer of less than 1,200 watts.... Maybe even an iron! With the increase in power usage from appliances, this has led to the 5A fuse.... well, not becoming redundant as such, but not used as much. Also, what with the attempts at dumbing-down BS 1362, instead of using the next suitable rating in the line of BS 1362, the dumbing-down has led to the skipping of all those other ratings and going for a 13A fuse instead! Is that really acceptable? I don't think it is! This video is to show YOU that there are ratings in BS 1362 other than 3A, 5A and 13A. Please do excuse the absence of the 1A fuse in the fuse line-up shown in this video. I have one, but annoyingly, I couldn't find it! :-( Below, I have set-up a table of fuse-ratings and their maximum currents*. The maximum currents are the amperages x 240v: Amps x volts = watts (or I x V = W) 1A................240w 2A................480w 3A................720w 5A...............1,200w 7A...............1,680w 10A..............2,400w 13A..............3,120w = Be aware of inrush currents on motor-based loads! So, when selecting your fuse size, you look at the power rating of the appliance. If that appliance uses 1100 watts, then a 5A fuse would be used. However, taking inrush into account, if you had a 2200 watt vacuum cleaner and chose a 10A fuse, the start-up current of the motor may very well blow a 10A fuse, so you wouldn't get much vacuuming done! In this case, a 13A fuse would be necessary. Some CRT-based television sets also needed a 13A fuse, even though they may have only been less than 600w when in use. The mathematics of it..... Take a calculator and enter the appliance's wattage (example = 2350 watt washing machine) Next, press 'divide' on the calculator Then, enter the ( UK ) supply voltage of 240 Next press '=' The answer in this example would be 9.791 That answer is the Amperage of the appliance. To select a fuse from the table above, you might initially be inclined to go for the 10A fuse....BUT! The washing machine has a motor in it and seeing as the total loading is very close to 10A anyway, when the heater is on inside the washing machine and the motor starts up, it might exceed the ability of the 10A fuse and blow it. Although the mathematics of it state that a 10A fuse would do the job, motor inrush says otherwise, and inrush always has to be taken into account on powerful motors. Because of this, the example above would require a 13A fuse. :-) -------------------------------------------- These are the fuses that a typical 'end-user' is most likely to come into contact with. Throughout the 'Fuses' videos, other types of fuse and circuit protective devices will be discussed and looked at. For now peoples.....Thanks for watching. :-) -BoomBoxDeluxe. Video thumbnail: Screen-shot at 0:05 ____________________________________ Tags used in this video: Fuse, Fuses, Circuit protection, Circuit protective devices, Plug top fuse, Cartridge fuse, BS 1362, BoomBoxDeluxe ----------------------------------------------------------------- -end.