Number of beams and beam heights of multiple light beam safety devices for access guarding in accordance with EN ISO 13855

Number of beams of the protective device Height of the beams above reference plane
4 300, 600, 900, 1200 mm
3 300, 700, 1100 mm
2 400, 900 mm
a = Safety distance S and DS
b = Height of the lowest beam above the reference level, see table above
c = Height of the highest beam, see table above
d = Measures to prevent access from the sides

Fig. 4.2.1-6: Safety distance and beam heights of multiple light beam safety devices for access guarding