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MCB size for dedicated fused spurs

Johno12345
A little thought, when installing a new circuit for a fused spur to supply an alarm or something similar, just about everyone uses a standard 2.5mm radial circuit, but the MCB size seems to vary from 16a down to 6. 


part of me (the larger part) thinks, just keep it standard 16a, and another part says to size the breaker to the load 


(I'm a specifier, not installer)
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    Graham,

    "special Preparation" of say 1.0 mm2 or whatever , would you be inclined to put a cable doubled doubled doubled ......... etc into that category? In an ideal world (which does not actually exist) such doubling (or twisting if you must) will take the conductor effective diameter up towards the terminal hole diameter thus making decent electrical contact and possibly mechanical soundness too.
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    Graham,

    "special Preparation" of say 1.0 mm2 or whatever , would you be inclined to put a cable doubled doubled doubled ......... etc into that category? In an ideal world (which does not actually exist) such doubling (or twisting if you must) will take the conductor effective diameter up towards the terminal hole diameter thus making decent electrical contact and possibly mechanical soundness too.
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