For an installation with a 30 kilovolt amp 3 phase transformer A480 Volt primary and 240 V secondary calculate the largest standard sized circuit breaker permitted for primary only protection to be used without applying note one of table for 450. 3B

The weight of the boat translates to a volume of water displaced. When this volume of displaced water is less than the volume of the hull, the boat will float. 

(weight(boat) x density(water)) / Total volume of the hull = percentage of hull submerged, i.e waterline