If you read it it always talks about battery to etc, the alternator is to battery
Example 3.2.2
Check the size of the following cables.
battery to master switch;
battery or master switch to starter solenoid;
battery to battery;
engine return to battery or master switch;
battery to bow-thruster motor;
battery to anchor winch motor;
battery to inverter system (over 1000w size).
The battery cables prescribed in the check must be
approximately 25mm2.
3.6.2
Certain circuits supplying power to equipment that requires a
continuous supply, e.g. bilge pump, may bypass the battery isolation
switch. However, the risks associated with a short circuit or
overload fault must be minimised particularly when the boat is
left unattended.
Again the battery does not supple power to the alternator
but that is my opinion