Step 1 : Standard to be used
Which standard should be used?
The ISO 13857 standard, which uses the metric system (mm) only, is recommended. The CSA ISO 13857:22 standard is identical to the ISO 13857:2019 standard.
The ANSI B11.19 standard is its equivalent in the imperial system (in.). The CSA Z432 standards use both metric and imperial (mm and in.), while OSHA legislation uses only the imperial system (in.).
Generally, each standard selected applies to machinery built or installed after its publication date: ISO 13857 (1996*), ANSI B11.19 (2019), CSA Z432-1999 (1999), CSA Z432-2004 (2004). The OSHA 1910.217 legislation has been applicable since 1971.
For the CSA Z432 standards, the choice of measurement unit (mm or in.) dictates the data set used. If “mm” is selected, the data used are only those in millimeters in the standard and not data in inches converted into millimeters. In other words, the app does not convert data from metric to imperial or vice versa.
* The data used come from ISO 13852:1996, which became ISO 13857 in 2008.
Before you begin…
Only qualified individuals should use the results provided by this app. The IRSST accepts no responsibility for the use and interpretation of this tool by the user.
Step 1: Which standard should be used?
The ISO 13857 standard, which uses the metric system (mm) only, is recommended. The CSA ISO 13857:22 standard is identical to the ISO 13857:2019 standard.
The ANSI B11.19 standard is its equivalent in the imperial system (in.). The CSA Z432 standards use both metric and imperial (mm and in.), while OSHA legislation uses only the imperial system (in.).
Generally, each standard selected applies to machinery built or installed after its publication date: ISO 13857 (1996*), ANSI B11.19 (2019), CSA Z432-1999 (1999), CSA Z432-2004 (2004). The OSHA 1910.217 legislation has been applicable since 1971.
For the CSA Z432 standards, the choice of measurement unit (mm or in.) dictates the data set used. If “mm” is selected, the data used are only those in millimeters in the standard and not data in inches converted into millimeters. In other words, the app does not convert data from metric to imperial or vice versa.
* The data used come from ISO 13852:1996, which became ISO 13857 in 2008.
Before you begin…
Only qualified individuals should use the results provided by this app. The IRSST accepts no responsibility for the use and interpretation of this tool by the user.
Select the type of calculation required
Find the size of an opening according to distance
Find the distance according to the opening
Enter the distance (d) between the guard and the danger zone.
Chose the shape of the opening in the guard and enter its dimensions (e).The shapes available vary depending on the standard selected.
