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6 107099-10-EN FR26 GLO 602 Printed in England
Safety Distance Calculations per US ANSI / OSHA standard
Ds = K(Ts + Tc + Tr ) + Dpf
With:
Ds = minimum safe distance between safeguarding device and hazard
K = speed constant: 1,6 m/sec (63 in/sec) minimum based on the movement being the hand/arm only and the body
being stationary (a greater value may be required in specific applications and when body motion must also be
considered)
Ts = worst stopping time of the machine/equipment
Tc = worst stopping time of the control system
Tr = response time of the safeguarding device including its interface (Tr for interlocked barrier may include a delay
due to actuation. This delay may result in Tr being a deduct– negative value).
Dpf = the “Depth penetration factor” is the maximum travel towards the hazard if the guard can be opened a certain
width or amount before a stop is signaled.
Dpf values from OSHA O-10 Table
If the maximum width or diameter of the opening is less
than or equal to (mm/in):
Dpf equals (mm/ in.)
6,4 / 0.25 12,7 / 0.5
9,5 / 0.375 38,1 / 1.5
12,7 / 0.5 63,5 / 2.5
15,9 / 0.625 88,9 / 3.5
19,1 / 0.75 139,7 / 5.5
22,2 / 0.875 165,1 / 6.5
31,8 / 1.25 190,5 / 7.5
38,1 / 1.5 317,5 / 12.5
47,6 / 1.875 393,7 / 15.5
54,0 / 2.125 444,5 / 17.5
152,4 / 6 800 / 31.5
Above 152,4 / 6 Not allowed
Example: Dpf = 0,5 when the guard can be opened up to, but less than 6,4 mm / 0.25 in before issuing a stop
command. Dpf = 444,5 mm / 17.5 in if the guard can be opened 54 mm / 2.125 in. At no time can the opening be
greater than 152,4mm / 6 in before issuing a stop command.
For more information, refer to the US regulations and standards (OSHA 29 CFR 1910.212 & 1910.217, ANSI B11.19
and ANSI/RIA R15.06).