Installing the Detector
TM40/40L Rev. (Ag), February 2019
41
•
If the equipment is likely to come into contact with aggressive substances,
then it is the responsibility of the user to take suitable precautions that
prevent it from being adversely affected, thus ensuring that the type of
protection provided by the equipment is not compromised:
•
Aggressive substances: acidic liquids or gases that may attack metals, or
solvents that may affect polymeric materials.
•
Suitable precautions: regular checks as part of routine inspections or
establishing from the material’s data sheets that it is resistant to specific
chemicals.
3.5
Installation Cables
The following are the guidelines for cable installation:
•
All cables to the detector must be well shielded in order to comply with EMC
requirement (see Table 22).
•
Ground the detector to the nearest ground point (not more than 3m from the
detector location).
•
Install the detector with the cable entries placed downwards.
3.5.1
Conduit Installation
The conduit used for the cabling must comply with the following:
•
To avoid water condensation or water in the detector, install the detector with
the conduits placed downward to include drain holes.
•
When using the optional tilt mount, use flexible conduits for the last portion
connecting to the detector.
•
For installations in atmospheres as defined in group B of the NFPA 72E, seal
the conduits
’
inlets.
•
When pulling the cables through the conduits, ensure that they are not
tangled or stressed. Extend the cables about 30cm/12
”
beyond the detector
location to accommodate wiring after installation.
•
After the conductor cables have been pulled through the conduits, perform a
continuity test.