There is no requirement for Grounded System in a 12 volt system. If you float a system means you have some additional extra cost involved in order to provide Over Current Protection. Chassis and exposed conductive surfaces are required to be Bonded. Do not get Grounded and Bonded throw you off. Ground does not necessarily exclusively meant dirrt. Think planes trains and boats.
The whole purpose of a Grounded System is a means and planned path to operate fuses. Look at the two pictures below. Both are GROUNDED SYSTEMS used in an RV. Note the GREEN GROUND. What makes a System Grounded, is one of the Circuit Conductors is Grounded aka Bonded to serve in place as Earth. In this case the Battery Negative Term Post is Bonded to the chassis which serves in place of Earth. So do not let GROUND trip you up.
The whole purpose of a Grounded System is a means and planned path to operate fuses. Look at the two pictures below. Both are GROUNDED SYSTEMS used in an RV. Note the GREEN GROUND. What makes a System Grounded, is one of the Circuit Conductors is Grounded aka Bonded to serve in place as Earth. In this case the Battery Negative Term Post is Bonded to the chassis which serves in place of Earth. So do not let GROUND trip you up.
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