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ISO 22578 Natural disaster safety way guidance system

This standard specifies the natural disaster safety way guidance system to help people evacuate to safe areas in the case of floods (both from rivers or inland waters), sediment disasters (debris flows, steep slope failures and landslides), storm surges, fire disasters, etc. (Established on XXXX.XX.XX)

Graphical symbols used in natural disaster evacuation guidance sign system

Measures for assuring visibility in darkness of natural disaster evacuation guidance sign system(Partial excerpt from Annex I)

1. Measures for ensuring visibility in darkness

With reference to general disasters, ISO 16069 specifies the safe way for guidance in darkness inside buildings and is extensively applied. It includes concrete specifications for guidance signs that are visible in darkness, and these signs are actually integrated into emergency exit signs.
The optimum natural disaster evacuation guidance sign system shall be selected considering the actual operation environment. The following factors shall be considered when designing an evacuation guidance sign system to be installed in a possibly dark place.

  • Countermeasures against total loss of electric power (preferable).
  • Durability of the display.
  • Colours and colour weather fastness.
  • Visual considerations assuming a flow of people - continuous installation of signs on footpaths and along walls (see ISO 16069).
  • Durability of signs installed on or near footpaths.

Signs to be installed shall preferably be suitable for the expected environmental conditions of the site of installation. Installers and designers of signs shall preferably confirm the above points by checking the materials certificates, requesting approval of materials and other documents submitted by the manufacturer.

2. Specifications of Phosphorescent materials used in measures for assuring visibility in darkness

(1) Performance of and test procedure for phosphorescent materials (Annex I.2.1.2.2.1)

The phosphorescent material used for measurement of phosphorescent luminance shall be pre-conditioned be being placed in completely dark enclosure for at least 48 hours where the ambient temperature is (23±2)℃ and relative humidity is (50±5)% in accordance with ISO 554. After that, the specimen shall be provided the light including 400µW/cm2 of UV intensity (measuring wavelength range 360 to 480 nm) for 60 min by the xenon-arc source of light specified in ISO 23603 and shall be measured at 20 min, 60 min, 120 min and 720 min after the excitation light is removed.

Phosphorescence luminance is classified into I and II by intensity.

Class Phosphorescence luminance 720 minutes after stopping excitation
I. 3 mcd/m2 以上 10 mcd/m2 未満
II. 10 mcd/m2 以上

(2) Other performance requirements (Annex I.2.1.2.3)

Weather resistance, Water resistance, and other resistances shall be in accordance with ISO 17398.

Precautions regarding natural disaster evacuation guidance sign system(Partial excerpt from Annex J)

1. Durability and suitability (Annex J.3)

The natural disaster evacuation guidance sign system should preferably be selected considering the environment of the installation site. The following factors should also be considered:

  • Durability of the base plate materials
  • Durability of displays
  • Colour selection and lightfastness
  • Resistance to abrasion caused by the flow of people and repeated cleaning
  • Waterproofness
  • Resistance to corrosion such as caused by seawater spray
  • Resistance to pasting of paper or flyers and writing of graffiti
  • Flame resistance
  • Types of accessories and their suitability
  • Resistance to wind pressure

Signs to be installed shall preferably be suitable for the expected environmental conditions of the site of installation. Installers and designers of signs shall preferably confirm the above points by checking the materials certificates, requesting approval of materials and other documents submitted by the supplier.