Net Safety Monitoring
MAN-0015 Rev 14 UVIRS-A/AR
10
November 07, 2008
F
IELD
I
NSTALLATION
WARNING:
•
Wiring codes and regulations may vary. Compliance with regulations
is the responsibility of the installer. Wiring must comply with
applicable regulations relating to the installation of electrical
equipment in a hazardous area. If in doubt, consult a qualified
official before wiring the system.
•
Do not open housing and expose electronics in a classified area .
(Do not open when an explosive atmosphere may be present)
Wiring
For For protection against line and extraneous transients, it is required to
install detector pig tail lead wires in a braided flexible conduit less than 5 feet
in length to the termination box. From the termination box to the power
supply the recommended detector cable is four conductor (or greater),
shielded 18 AWG rated 300 V for distances up to 150 feet. When cable is
installed in conduit, the conduit must not be used to support wiring to any
other electrical equipment. Detectors can be located over 150 feet and up to
2000 feet if 16 AWG shielded conductor is used. The maximum distance
between the detector and the power supply is limited by the resistance of the
connecting wiring, which is a function of the gauge of the wire being used.
Refer to “Appendix C, Resistance Table (Ohms)".
Grounding
Proper shielding and grounding procedures, for the specific area must be
followed. Consult local electrical code.
S
EALING
Water-proof and explosion-proof conduit seals are recommended to prevent
the accumulation of moisture within the junction box. Seals should be
located as close to the device as possible and not more than 18 inches
(46 cm) away. Explosion-proof installations may require an additional seal
where conduit enters a non-hazardous area. When pouring a seal, use a fibre
dam to ensure proper formation of the seal. Seals should never be poured at
temperatures below freezing.
The jacket and shielding of the cable should be stripped back to permit the
seal to form around the individual wires. This will prevent air, gas and water
leakage through the inside of the shield and into the enclosure.
It is recommended that explosion-proof drains and conduit breathers be used.
Changes in temperature and barometric pressure can cause 'breathing' which
allows moist air to enter conduit. Joints are seldom enough to prevent
'breathing'.
Summary of Contents for UV/IRS-A
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