Summary of Regulations(a) The navigation lights must be connected directly or through a transformer to the main or emergency switchboard i.e., no switches are to be in between the source and the dedicated distribution board. The distribution board must be easily accessible to the officer of the watch. (b) The masthead, side and stern lights shall be connected separately to the above distribution board which is reserved for this purpose. (c) Each light shall be controlled' and protected in each insulated pole by a switch and fuses or by a circuit breaker mounted on the above distribution board (in case of failure of the ship's mains, the double pole switch may be changed over to an emergency source of supply). (d) The bulb shall provide a uniform intensity output as mentioned in Table 22.7 below -hence a cage winding is used. (e) Each light shall be provided by an automatic insulator which gives an audible and / or visual warning in the event of an extinction of the light. If an audio device alone is used, it shall be connected to a separate source of supply - e.g., a battery. If a visual signal is used, which is in series with the light, means must be provided to prevent the extinction of the light owing to the failure of the visual signal. (f) The visual device must be so connected that its failure does not extinguish the navigation light circuit. (g) Provision shall be made on the bridge for such navigational lights to be transferred to an alternative circuit.
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