Crush hazards
marked C1 to C3
Crushing is between a moving part and a stationary
part. It is most significant below 500mm when it
may be up to 400N for less than 750ms. Moving
part needs to reverse within 5 secs so that pressure
is released to 25N.
Impact zones
marked R1 to R3
Impact refers to a moving object striking a person
outside the crush zone. This is 1400N for less than
750ms. There could be a temporary object (a car) in
the R zones, hence the use of photo-beams.
Safety distances
marked S1 & S2,
At least one photo-beam 300—700mm high must
supplement force limitation. Spacing between the
beams and the limit of the moving part must be less
than 200mm. Nominal spacing between vertical
gate bars is 100mm. Safety must be effective to
H
,
the maximum height of the moving part, or 2.4m,
whichever is the least.
Edited from DHF TS 011 Code of Practice
‘Draw in’ or Shear
Gaps where a body
part could be drawn in are not allowed. Limbs have
different nominal sizes. Finger gaps need to be less
than 8mm (
D2
), arms less than 100mm etc. A solid
infill sliding gate needs to be less than 8mm from
the post. Vertical bars on sliding gates (
D2
) present
multiple shear risks against the supporting post.
Entrapment
Ez
is an area where a
person can be entrapped without being in contact
with the gate. Entrapment is not permitted unless a
manual release is provided inside the zone.
Finger traps
F1
is a finger trap as a result
of poor hinge design. Designs must ensure moving
gaps are under 100mm,
and
either under 4mm or
over 25mm,
and
the gap changes by less than 20%.
Motor PSR is not an acceptable finger trap solution.
Hold to run speed of a closing gap in a crush zone
must be less than 0.5m/s. The gate must stop
within 50mm in the crush zone, or 100mm at mid
travel.
This guide is a helpful reference to identify risk.
It is not a directive. It does not suggest solutions.
AXEL
18
Fig 38
Fig 37
