That is because it is not made up it is a fact. It is also why only 3 and 13 amp are colour coded. All the unofficial ones, 1, 2, 5, 7, and 10amp are not colour coded and are black.
In the early days of the system the other sizes were recognised and were colour coded, 1A green, 2A can't remember, 3 amp blue (later changed to red), 5 amp grey, 7 amp yellow, and 13 amp brown.
How are the 1 amp fuses "unofficial"? They are the only ones that fit shaver adapters.
...I don't know where Winston made up his claim from?.
It's not "made up". Although other ratings can still be bought, BS 1362 only recognises 2 values of plugtop fuses & only specifies breaking times for 3A & 13A fuses. 3A fuses should be fitted to appliances of less than 700W & 13A fitted to higher rated appliances.
Not strictly true as the fuses fitted in plugs (not plug tops which are the lids of the plugs) are to protect the cable not the appliance. Some appliances below 700W have a starting surge above that.
I know that it's to protect the cable, but as a general rule of thumb, 700W is often quoted.
btw...Plug tops are not covers or lids. Nearly all elctrical outlets call them plug tops. Try Googling plug top.
I know that it's to protect the cable, but as a general rule of thumb, 700W is often quoted.
That's why you don't have only 3A and 13A plug fuses
There's not much that you can run from a 3A fuse (as plug fuses are fast blow), and not much that requires a 13A one - the majority of items would require something in between.
For example a CRT TV, that might only consume 0.5A, can't be run from a 3A fuse - you need a considerably larger one (but 13A seems a little excessive).
Comments
How are the 1 amp fuses "unofficial"? They are the only ones that fit shaver adapters.
Totally different fuses, those are BS646 (or at least used to be).
btw...Plug tops are not covers or lids. Nearly all elctrical outlets call them plug tops. Try Googling plug top.
That's why you don't have only 3A and 13A plug fuses
There's not much that you can run from a 3A fuse (as plug fuses are fast blow), and not much that requires a 13A one - the majority of items would require something in between.
For example a CRT TV, that might only consume 0.5A, can't be run from a 3A fuse - you need a considerably larger one (but 13A seems a little excessive).
http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/product-datasheets-a/Bus_Ele_DS_2042_TDC180.pdf
Obviously they all comply with BS1362 and are marked accordingly.