With mechanical systems installation wrapping up, and furniture modules being installed, the time has come to begin wiring on the first of the FPB 78s.
The lead photo is a small portion of the main electrical cabinet adjacent the entry door to the great room.
Above we are looking at some of the wiring which leads inside the coamings to the great room helm. There will be in excess of six kilometers/four miles of wiring when this is finished.
The heavy red and yellow cables, 4/0, are for the bow thruster, windlass, and foredeck kedging winch.
There are a pair of 4/0 cables for positive and a pair for negative. The same holds true for the connections between the engine room alternator rectifier assemblies and the batteries. We are talking some serious amperage here folks, and minimized voltage drop, only accomplished with lots of wire, is highly desirable. Astute observers may wonder why these cables are twisted rather than being run in innate parallel lines. When you have parallel DC current carrying wire, it tends to set up magnetic fields. Big wire, big amperage, big magnetic field, which causes havoc with compasses. But if you twist them, as shown above, the twisted pairs of positive and negative cancel generation of magnetic force.
Outback solar power controllers and a Victron autotransformer are mounted outboard of the stairwell between great room and accommodation deck.
Three 5kW24V in/230VAC out inverter chargers will mount further forward. Note the space between these units and between them and the insulated hull. This is to insure airflow around this gear. Good airflow is required for efficient operation. You can see the dorade vent in the upper left corner of the photo. There is a 700 CFM extraction fan on this vent, should it be necessary to force cool the area.
Same area as the preceding photo, only here with the solar controllers and auto-transformer removed. The gray box will house AC current components, in particular transfer switches.
This wiring is running across the boat, under the great room sole, towards the galley.
A watertight bulkhead penetration. This will eventually be sealed with a special foam.
The area above the aft starboard stateroom shower, which feeds up into the great room electrical cabinet.
Combine these miles of wiring–the air conditioning and heating gear, fresh, gray, salt, sewage (black and grey) fuel and hydraulic plumbing, furniture, insulation, and structure–and you begin to see where this is a complex business. Integrating this into a holistic, and efficient, yacht is like playing three dimensional chess, only more difficult.