YuT666 wrote:A big thanks to you all ...
This is an interesting matter (for me).
Our usual fuses (here in germany) have the sizes 5x20mm and 6x30mm and i can't remember any fuses in 99% of our plugs.
The main fuses in the UK seem to have 6x25mm. My Micro/Master/AcornA3000/Tatung are using 3A ... but a found a loose 6x25 fuse with 5A. Maybe for the Dragon32? The Dragons plug is empty and i can't find an info inside the plus.
And i really don't know exactly, which residual current operated circuit breaker (i hope, that this translation is right) you usually use in the UK ... we mainly use 16A ones here.
BS 1362 Fuse dimensions (as used in UK 13A plugs):
Dia - 6.3mm +0mm, -0.025mm (1/4 inch approx)
Length - 25.4mm +0.8mm, -0.4mm (1 inch)
We also use 5mm dia x 20mm length and 6.3mm (1/4 inch) dia x 32mm (1 and 1/4 inch) length in equipment and appliances.
Occasionally (normally in industrial equipment) are found 5mm x 25mm fuses, which have a coloured indicator cap (which falls away when the fuse blows).
shows various fake UK mains plug fuses.
I don't have a Dragon 32, so don't know the answer, but I would have thought it also would have used a 3A fuse.
In older homes where the consumer unit has not been replaced, either rewireable fuse holders (using fuse wire) are used, or cartridge fuses are used. In modern homes, or where a consumer unit has been replaced, we have MCBs (Miniature Circuit Breakers). MCBs have two methods of detecting a short circuit or overload (thermal and magnetic). Typical ratings found in modern units are 3A (door bells, smoke / fire alarms, alarm systems etc), 6A (lighting circuits), 10A (industrial lighting), 16A (water heaters, radial spurs), 20A (radial spurs), 32A (ring main circuits, cookers), 40A (showers, cookers), 45A (showers, cookers), 50A (high power showers). For protection against insulation failure (including electric shock) RCBOs (Residual Current Breakers with Overcurrent protection) are available in most of the ratings listed above (except for 3A). These trip just like the MCBs, but also if there is an imbalance in the current between the line (live) and the neutral wires (which indicates an insulation failure / earth fault).
Note that where fuses or fuse wire is used in a consumer unit, the fuse values are 5A, 15A, 20A, 30A. Some MCBs designed to fit in consumer units what were originally designed for fuses have the same ratings as the fuses they replace.
Our 13A power outlets / sockets are normally wired to a 30A or 32A ring main circuit. Hence why U.K. 13A plugs have a fuse included.Mark