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 ships firemain. Provisions are made for different sources of electrical power to these pumps: normal and alternate supply from the ships service generators, emergency supply from the diesel-driven emergency generators, and the casualty power system itself.

Many ships, such as carriers, tankers, and tugs, have independent diesel-driven fire pumps. If ships pumps and firemain are damaged, these diesel-driven pumps can be used to furnish large amounts of water for firefighting purposes.

LIGHTING SYSTEM

On ships using a.c. generators, the ships 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. Lighting throughout the machinery spaces is supplied from the normal switchboard for the compartments involved, with some lights in each space supplied from the alternate switchboard. A few lights in each compartment are supplied through automatic bus transfer equipment from circuits originating at the emergency switch-boards. A few lights in each compartment are sup-plied through automatic bus transfer equipment from circuits originating at the emergency switchboards.

Automatic type hand lanterns are provided to supply an instantaneous source of illumination, in the event of complete failure of the ships service and emergency lighting systems. These relay-operated hand lanterns are installed at vital stations. In addition to these, nonautomatic type hand lanterns are also installed at these stations. An EN1 or ENC in charge of an engineering space has the supervisory responsibility to see that the hand lanterns, especially the automatic type, are not removed except for actual intended use, and that hand lanterns are available for use at all times. Although the Electricians Mates have the responsibility for the maintenance of the hand battle lanterns, it is the duty of the petty officer in charge of the space to see that personnel do not remove the lanterns or use them for unauthorized purposes.

The EN1 or ENC should also ensure that personnel have an adequate number or flashlights available for use should all the lights in an engineering space go out.