Siemens Panel PC 677 Operating Instructions Manual page 13

Degree of Protection IP54
The IP54 degree of protection is guaranteed for screw mounting.
Caution
Protect the panel seal when screw mounting
Ensure you do not damage the panel seal when mounting the device with screws.
Notice
Control Cabinet Installation; Material Strength at the Mounting Cut-out
Please ensure that the material strength at the mounting cut-out is a maximum of 6 mm.
Please follow the specifications for the dimensions in the "Preparing the Mounting Cut-out"
section.
The degree of protection can only be guaranteed when the following requirements are met:
1. The material strength at the mounting cut-out must be at least 2 mm.
2. The deviation from the plane in relation to the external dimensions for an installed HMI
device is ≤ 0.5 mm
SIMATIC Panel PC 677
Operating Instructions (Compact), Edition 07/2006, A5E00877730-01
Operating instructions (compact)
1.4 Installation / panel-mounting
1-11