ISO 15370:2021 Ships and marine technology — Low-location lighting (LLL) on passenger ships — Arrangement.
4.1.2 The supplementary emergency lighting for ro-ro passenger ships required by Chapter 11-1. Regulation 42-1 of SOLAS 74, as amended, may be accepted to form partly or wholly the LLL system. provided that such a system complies with the requirements of this document.
4.1.3 The LLL system consists of the following components: the guidance lines at low-location, the marking of exit doors, and the signs at low-location relevant to escape routes and fire-fighting equipment.
4.1.4 For EP systems, the colour of the line sources or point sources of light shall be green, white or yellow.
4.1.5 Escape route signs shall be placed adjacent to, or integrated in, the low-location guidance lines.
4.1.6 LLL guidance lines shall be as continuous as practicable in order to provide a visible delineation of the escape routes. Interruption of the LLL system due to constructional practicalities such as corridors, doors, small protrusions, as well as to the ship’s plants and systems (ducts, cables, pipes, etc.), fixed furniture or artworks shall be permitted provided that they neither exceed 2 m in length nor impair the visible delineation of the escape route.
4.1.7 The LLL system shall function continuously for at least 60 mm after its activation.
4.1.8 LLL products shall not contain radioactive materials unless such materials are designated “sealed radioactive materials” and are tested in accordance with ISO 2919. Materials containing radionuclides as given in ISO 2919:2012, Annex A, are considered sealed radioactive materials that should be tested in accordance with ISO 2919.
4.2 Phosphorescent systems
4.2.1 Phosphorescent (PL) materials shall provide a luminance of at least 15 mcd/m2 measured
10 mm after the removal of all external illuminating sources. The system shall continue to provide luminance values greater than 2 mcd/m2 for 60 mm. The luminance shall be measured at the surface of the materials.
4.2.2 For excitation from an B W tubular fluorescent lamp of standard F2 cool white with a colour temperature of 4 100 °K. Annex A specifies the method of test for determining the minimum illuminance, measured at the surface of the phosphorescent material, which would enable the phosphorescent material to meet the minimum luminance requirements at 10 mm and 60 mm. For a different excitation lamp and luminaire, the test procedure of Annex A can be used to determine the minimum illuminance for the particular lamp and luminaire.
4.2.3 PL guidance lines shall have a width of 75 mm or greater. PL guidance lines having a width less than 75 mm shall only be used if the luminance is increased to compensate for the reduced width in accordance with Annex D.
4.2.4 Escape route signs shall have minimum height of 50 mm or the width of guidance line if greater, and be made of phosphorescent material, and use graphical symbols in accordance with ISO 24409-1 and ISO 24409-2.
A supplementary direction arrow graphical symbol cannot be used on its own; it shall be in combination with a safety sign (e.g. exit, lifeboat, assembly station, as given in ISO 24409-2).
4.2.5 PL materials shall be flame-retardant in accordance with ISO 3795 with the contact of 38 mm flame for 15 sand classified as Fl.
4.2.6 Annex A specifies testing methods on phosphorescent low-location lighting materials.
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