Bosch 500 - Manual (Page 19)

MIC Series 500 Camera Mounting | en 19
Bosch Security Systems, Inc. User’s Manual F.01U.173.601 | 2.0 | 2010.11
Figure 4.12 MIC 500 Series camera mounting positions: Inverted, Upright, and Canted
4.4 Earthing the MIC 500 Series Camera
The camera module and housing are electrically isolated; however, it is recommended that the
housing be earthed for safety. This safety earth should be a bonding connection, such as one
of the securing bolts, to the outside case of the camera. The camera should be earthed to
prevent ground loops and video distortion caused by electrical interference. If the system is
copper throughout and the camera pictures are fed back to the control room coaxial copper
cable, the camera should be earthed at the video termination point in the control room. If the
video is transmitted back to the control room via some non electrical connecting medium (for
example, fiber optic, radio, or microwave link), the camera should be earthed at the
transmitter point in the Power Supply Unit. If dual earthing is unavoidable, a video isolation
transformer should be fitted between the two (2) earths.
4.5 Lightning Protection
If the camera is positioned in a highly exposed area where lightning strikes may occur, it is
recommended to install a lightning conductor within 0.5 m of the camera and at least 1.5 m
higher than the camera.
The construction of the housing itself is capable of coping with secondary strikes. If the
correct lightning protection is applied, no damage to the internal electronics or camera
should result. Additionally, an earth bonding connection to the case provides protection
against damage from secondary strikes.
4.6 Electrical Connections
All connections to the camera are provided through the screw terminal connections in the MIC
power supply. A purpose-built composite cable for use with the camera is available in lengths
of 2 m, 10 m, 20 m, and 25 m (required, not supplied); these cables are pre-made with a
female terminated 12 way connector fitted to them for attachment to the male connector
installed into the base of the camera.