Manual

TM 40/40R, Rev (4) November 2010
Installation Cables 21
2.5 Installation Cables
Follow the following guideline for the cable installation:
• All cables to the detector must be well shielded in order to comply with
EMC requirement (see Technical Specifications on page 58).
• 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.
2.5.1 Conduit Installation
The conduit used for the cabling must comply with the following:
• To avoid water condensation water in the detector, install the detector
with the conduits placed downward, that 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 30 cm. (12 in.) beyond the
detector location to accommodate wiring after installation.
• After the conductor cables have been pulled through the conduits,
perform a continuity test.