Annex III of NR12 – Permanent Means of Access

Figure 1: Range of means of access according to the slope – Pitch angle

Key: A: ramp B: ramp with horizontal cross pieces to prevent slipping C: stair with riser D: stair without riser E: ship type ladder Source: ISO 14122 - Safety of machinery - Permanent means of access to machinery.
Key:
A: ramp
B: ramp with horizontal cross pieces to prevent slipping
C: stair with riser
D: stair without riser
E: ship type ladder
Source: ISO 14122 – Safety of machinery – Permanent means of access to machinery.

Figure 2: Example of stair without riser

Key: w: width of ladder h: height between treads r: projection between treads g: free depth of the tread α: slope of the ladder - pitch angle l: length of the rest platform H: height of the ladder t: total depth of the tread
Key:
w: width of ladder
h: height between treads
r: projection between treads
g: free depth of the tread
α: slope of the ladder – pitch angle
l: length of the rest platform
H: height of the ladder
t: total depth of the tread

Figure 3: Example of fixed ship type ladder

NR12_Annex3_Figure3

Figure 4A, 4B and 4C: Example of fixed ship type ladder cage

Figure 4A
Figure 4A
Figure 4B
Figure 4B
Figure 4C
Figure 4C

Figure 5: Fall protection system on platform (Dimensions in millimeters)

NR12_Annex3_Figure5
NR12_Annex3_Figure5a
NR12_Annex3_Figure5b

Key:
H: height of top bar, between 1000 mm (one thousand millimeters) and 1100 mm (one thousand hundred millimeters)
1: platform
2: footer bar
3: intermediate rail
4: top bar – handrail