5amp fuse should be big enough for all but the biggest lathe in the Charnwood range of lathes.
A rough guide I was told as an apprentice was volts x amps =watts so 5x240 = 1200watt, I'm not saying this is an exact calculation just a rough guide.
But as most of the Charnwood range is between 250 & 750 Watts a 5 amp fuse should be fine, so as already suggested your lathe needs to go back, unless of course it's the 2hp lathe.
A rough guide I was told as an apprentice was volts x amps =watts so 5x240 = 1200watt, I'm not saying this is an exact calculation just a rough guide.
But as most of the Charnwood range is between 250 & 750 Watts a 5 amp fuse should be fine, so as already suggested your lathe needs to go back, unless of course it's the 2hp lathe.