Siemens SIMATIC PANEL PC 877 - Manual (Page 41)

Installation
5.2 Securing the device with screws
SIMATIC Panel PC 877
Operating instructions, Release 07/2006, A5E00877780-01
5-5
IP 54 degree of protection
The IP54 degree of protection is guaranteed for screw mounting together with the ring seal.
Caution
Observe the panel seal when mounting
Ensure you do not damage the panel seal when mounting the device.
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