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In the 1940s and into the 1950s when I was growing up, power cuts, common as they were, were not the only reason why electrical equipment suddenly stopped working. The other reason was that a fuse had blown. These fuses were not inside the electric plug attached to the equipment, as in later years. They were in a central fuse box - see below. There were no fuses in the old plugs.
A fuse was a short length of wire with a fairly low melting point such that it melted when a current surge became too great. This broke the circuit so that everything plugged into that circuit suddenly stopped working.
There were different designs for holding the fuses inside the fuse box. The part that held the fuse wire was ceramic with a narrow window to show at a glance whether the fuse had melted. The containing box was probably Bakelite.
One that has survived in our junk box is shown in the photo.
All the fuses for a house were in a box called a fuse box which was situated where the electric power came into the house. Ours was in the cupboard under the stairs in the hall. There was one fuse for each circuit and there were probably several sockets on any one circuit.
When a fuse blew, it had to be replaced. Hardware shops sold fuse wire in various thicknesses to guard against different sizes of power surge.
A pack of fuse wire was always kept ready for use on top of the fuse box.
Of course fuses blew to protect against surges from faulty equipment. They also blew if too many pieces of electrical equipment were turned on in the same circuit.
If a fuse kept blowing, it meant that something more serious was wrong with a piece of equipment on that circuit or that a piece of equipment needed to be moved to another less-used circuit.
When motors were first turned on, they tended to take a larger current than when they were running. So that was when fuses would go blow. As young boys, my friend and I used to turn on our motor without its belt on, so that the load was less and it took less current. Then the fuse didn't blow. When the motor was fully up and running, we would put the belt back. Not to be recommended!
In the 1950s, there was a regulation that every piece of equipment must have a plug with its own fuse. The plugs were called 13 amp plugs, although they were often fitted with fuses of other sizes, depending on the power rating of the equipment.
For some years, electrical equipment had been sold without a plug. So plugs had to be bought separately. A rough and ready check for someone's general competence was whether they could 'wire up a plug' with the correct coloured wires going to the correct contacts and with the correct fuse.
Later on, much equipment was sold with its cable moulded onto the appropriately wired plug.