Siemens S5-135U/155U System Manual page 44

Installation Guidelines
AC Power
A power socket should be fitted in each cabinet for the AC supply to
Connection for
programmers. The sockets should be powered from the distribution system to
Programmers which the protective conductor for the cabinet is also connected.
Cabinet Lighting Use incandescent bulbs, such as LINESTRA lamps, for cabinet lighting.
Avoid using fluorescent lamps because they generate interference fields. If
the use of fluorescent lamps cannot be avoided, apply the measures shown in
the following figure.
Figure 3-7
3-18
Screen Over the Lamp
Shielded Cable
Metal-Enclosed Switch
AC Filter or
Shielded Power Cable
Measures for Interference Suppression of Fluorescent Lamps in a
Cabinet
System Manual
C79000-G8576-C199-06