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Reference Manual
July 2014 MAN-0081, Revision 4
4
2.4 Wiring
Failure to follow these installation guidelines could result in death or serious injury. Ensure that
only qualified personnel perform the installation.
Electrical shock could cause death or serious injury. Use extreme caution when making contact
with the leads and terminals.
Do not open the junction box enclosure when in a classified area or when an explosive
atmosphere may be present unless the power to
the sensor has been removed.
Prior to touching the painted enclosure surface
or non-
metallic labels, dispel any charge in your
body or equipment by touching a grounded metal surface to prevent the generation of a spark.
Installation shall be in
accordance with the manufacturer's instructions and the National Electrical
Code
®
, ANSI/NFPA 70, the Canadian Electrical Code C22.1, or EN60079-14, as applicable.
The use of shielded cable is highly recommended to protect against interference caused by
ext
raneous electrical or electromagnetic ‘noise’. To meet EN/IEC61326 EMC requirements, multi-
c
onductor braid shield cable is recommended. Connection of conduit or cable glands should be done
so by use of tools.
In applications where the wiring is installed i
n conduit, the conduit must not be used for wiring to
other electrical equipment.
The junction box may be susceptible to ESD. Refer to
Section 5 for further information on proper
handling of this equipment.
The temperature rating of the wires connected to the junction box must be greater than 100°C
(212°F)
2.4.1 Device separation distance
The maximum separation distance between the junction box and the connected device is limited by
the resistance of the connected wiring, which is a function of the gauge of the wire being used. Net
Safety recommends that separation must not exceed 2000 feet (610 meters) while using 16AWG
(1.31mm
2
) wire. The Net Safety Millennium SC1100 combustible sensor should not be separated
more than 150 feet (46 meters). Refer to Section 6 for wire gauges and resistance values.
2.4.2 Seals
To fully avoid any environmental exposure, the use of seals is recommended, especially for
installations that use high
-pressure or steam cleaning devices in proximity to the junction box
Water-proof and explosion-proof conduit seals are recommended to prevent water accumulation
within the enclosure.