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MIC400 Series Camera | Installation and Operation Manual AAAEN | 13
Bosch Security Systems Issue 1
Earthing of the MIC400 camera
1. The camera module & housing are electrically isolated so the housing
should be safety earthed regardless. The safety earth should be a bonding
connection to the cameras outside case for example one of the securing
bolts.
2. The camera should be earthed at one point only to prevent earth loops &
thus hum bars showing on the control room monitor.
3. If the system is copper throughout & the camera pictures are fed back to
the control room coaxial copper cable, then the camera should be earthed
at the video termination point in the control room & nowhere else. In this
case the PCB “Earth Link” should be broken.
4. If the video is transmitted back to the control room via some non electrical
connecting medium, e.g. fibre optic, radio or microwave link, then the
camera should be earthed at the transmitter point in the psu. The PSU
“Earth Link” may be used for this purpose.
5. If dual earthing is unavoidable then a video isolation transformer should be
fitted between the two earths.
Lightning Protection
If the camera is fitted in a highly exposed place then consideration should be given
to lightning protection. A good earth bonding connection to the case itself will
provide protection against damage from secondary strikes.
Where there is a risk of a primary strike hitting the camera housing directly, it is
recommended that a separate lightning conductor be fitted within 0.5m of the
camera and at least 1.5m higher than the camera.
The construction of the housing itself is very capable of coping with secondary
strikes and no damage to the internal electronics or camera should result if correct
lightning protection is applied.
Underwater Installation
The MIC400 series are IP68 rated units, excepting the MIC400PA speakers which
are IP67, this allows complete submersion in water to a depth of 1M. The
MIC400UL and MIC400UT models allow submersion to a maximum depth of 25M
due to the special seals fitted to these models.
Typically the MIC400UL an MIC400UT are mounted inverted on a Deep Conduit
Adaptor fitted to the base, additional sealant or gaskets are applied to the joint of
the camera foot and the Deep Conduit Adaptor to ensure a watertight seal.
A suitable waterproof conduit gland and conduit is then used to carry the
composite cable to the surface for installation in the power supply. Wall Mount
Brackets (MIC-WMB) can also be used to mount the MIC400 underwater following
the same precautions as outlined above.
CAUTION: If the camera is mounted ball down it is
essential that the connector and base area of the
camera are completely sealed from water ingress.
CAUTION: Any water getting into the connector is
liable to cause corrosion to the connector pins leading
to unreliable operation of the camera unit.
CAUTION: To prevent water penetrating the composite
cable connector threads, the 25mm thread should be
sealed at final installation using PTFE tape.
Alternatively a suitable sealant may be liberally applied
to the thread prior to final tightening.
CAUTION: It is the responsibility of the installer to ensure
the correct water proof conduit glands, conduit and
gaskets/sealants are used for the installation to ensure no
water enters the cameras base and reaches the composite
cable connector. Failure to ensure a water free connector
will lead to corrosion of the camera connecter and to
camera failure. Care must also be taken to ensure that any
sealants used are non toxic to marine life.