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BS EN ISO 20471 for Arc Flash clothing

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High visibility clothing

This International standard specifies the requirements for clothing designed to increase the wearer's visibility in order to make them more noticeable in hazardous situations during the day and at night (illumination in car headlights). It has replaced EN 471 which has now been withdrawn.


The contents of this EN Standard

This standard's icon is a safety vest placed adjacent to a number which represents the design classification of the garment. The classification is 1, 2 or 3 where Class 1 provides the minimal level of visibility and class 3 provides the highest level prescribed by the standard.


The Classification

The classification is derived from the number of square metres of fluorescent fabric and the number of square metres of reflective strip incorporated in a garment.

 Class 1Class 2Class 3
Fluorescent material 0,14 0,50 0,80
Reflective material 0,10 0,13 0,20
Combined material 0,20    

 

EN ISO 20471 provides the following guidance on risk factors and selection of clothing:

Risk LevelFactors related to the risk levelRisk Level
Vehicle SpeedType of road user
High Risk ISO 20471 class 3 > 60 km / hr passive High Visibility Day & Night Visibility 3600 (visible from all sides) Design for form recognition Encircling the torso Quantity and Quality for day & night
High Risk ISO 20471 class 2 <= 60 km / hr passive Day & Night Visibility 3600 (visible from all sides) Design for form recognition Encircling the torso Quantity and Quality for day & night
High Risk ISO 20471 class 1 <= 30 km / hr passive Day & Night Visibility 3600 (visible from all sides) Design for form recognition Quantity and Quality for day & night

 

The fluorescent fabric must encircle the torso, sleeves and trouser legs with at least 40% or the minimum required area of fluorescent material present on the front of the garment ( and on the back of the garment). The reflective strips must be 50 mm wide and the space between 2 reflective strips must be at least 50 mm. The distance from ‘the end’ of the garment (e.g. the end of a trouser leg) to the reflective strip must also be at least 50mm. Reflective strips can be positioned in a variety of different ways; Class 3 garments must cover the wearers torso and have either reflective strips about the sleeves or full length trouser legs.

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