Most ships have electric-driven fire pumps located outside the engineering spaces.
These pumps furnish water under presssure to their own piping system or to the ship s firemain. Many ships, such as carriers, tankers, and tugs, have independent diesel-driven fire pumps. If ship s pumps and firemain are damaged, these diesel-driven pumps can be used to furnish large amounts of water for firefighting purposes. On ships using a.c. generators, the ship s service and emergency lighting systems are energized from the generator and distribution switchboards through a bank of transformers. These transformers supply power to the lighting system through the lighting distribution panels.