BS ISO 15370:2021 pdf download – Ships and marine technology — Low-location lighting (LLL) on passenger ships — Arrangement
4.3 Electrically powered systems
4.3.1 Electrically powered systems shall be connected to the emergency switchboard as required by Regulation II-1/42 of SOLAS 74, as amended, so as to be powered by the main source of electrical power under normal circumstances and also by the emergency source(s) of electrical power (as identified by Regulation II-1/42.3) when the latter is in operation. Alternatively, for passenger ships carrying more than 36 passengers and built before 1994-10-01, EP systems may be connected to the main lighting system so that independent batteries provide a backup of at least 60 min and are charged from the main lighting system.
4.3.2 The components of EP LLL systems can consist of planar light sources or point light sources or a combination of both.
4.3.3 The minimum luminance of planar line sources used for LLL guidance lines shall be 20 cd/m 2 . The minimum width of the line source shall be 10 mm. The ratio of the maximum luminance to the minimum luminance along a line source shall not be greater than 2:1. The 10 mm line width may be realized by two lines of 5 mm with a separation no greater than 1 mm. Where the line source is horizontal bulkhead mounted, the perceived width of the line may be increased by sloping the horizontal line slightly out at its base so that it faces upwards and inwards towards the line of sight of an escapee. The minimum width of the line source shall remain 10 mm.
4.3.4 The luminance performance of the components of the LLL system, as described in 4.1.3, shall be the same as that of the guidance line.
4.3.5 Escape route signs made of electrically powered planar light sources shall use graphical symbols in accordance with Figure 1 of ISO 16069:2017 or with modified geometry if on the floor; see Figure 2 of ISO 16069:2017. The minimum height of the escape route sign shall be 30 mm. The minimum luminance of the green colour shall be 20 cd/m 2 . The contrast colour shall be either white with a luminance at least five times greater than the luminance of the green colour, or be black.
4.3.6 The luminous intensity of point sources used for-LLL guidance lines shall be not less than 30 mcd. The spacing between the point sources shall be no greater than 200 mm. The luminous intensity of a point source can be produced by a cluster of point sources. Where the line source is horizontal bulkhead mounted, the direction of peak intensity of the point light sources shall be pointing upwards and inwards towards the line of sight of an escapee.
4.3.7 Escape door frame marking shall be formed by continuation of the point source line. The luminous intensity of point sources used for door frame marking shall be 100 mcd or greater, the direction of peak intensity pointing normally into the corridor. The spacing between the point sources shall be no greater than 200 mm.
4.3.8 Escape route signs made of point sources can be used to outline the graphical symbol of the escape route signs in accordance with Figure 1 of ISO 16069:2017, or with a modified geometry if on the floor; see Figure 2 of ISO 16069:2017. The colour of the outlining point sources shall be green. The height of the graphical symbols shall be in accordance with 6.5.2. The maximum spacing between the point sources shall be 5 mm. The luminous intensity of every single point source used for the escape route sign shall be ⩾ 100 mcd.
4.3.9 The power-supply arrangements to the EP system shall be arranged so that a single break in the cabling does not result in the system becoming ineffective. This can be achieved by using at least two battery power supplies in each single main vertical fire zone.BS ISO 15370 pdf download.