January/February/March 2020 I 33
Pathways
• The pathways will be galvanized rigid steel conduit
from the end device to one of the existing cable trays
and from the tray down to the network zone enclosure.
This is appropriate considering the physical environment
also conforms to the client stipulation for protection
to 30 feet AFF.
• The low voltage section of the cable trays will be used
to route cabling back toward the network zone enclosure
location, since they are existing, have additional
capacity, and are positioned to minimize conflict with
production operations while being accessed.
• This choice meets the client requirements, and it is
most efficient from both material and installation
labor perspectives.
Components
• At the camera locations, rugged outlets will need to be
installed, remain dust-tight and support a shielded
cable solution. M12 X-Code outlets are the appropriate
choice because they offer an IP65 (often IP67) rating
and connectivity for all eight cable conductors to support
PoE. The rigid steel conduit can be terminated
at a small (6”x 6”x 4”) dust-tight enclosure where the
permanent link cable will be terminated in modular
plug terminated link (MPTL) style. A bulkhead adapter
designed to connect an RJ45 on the inside of the enclosure
to M12 on the outside of the enclosure will also
need to be installed through one of the enclosure walls
(downward facing preferred). The client supplied cameras
will have dust-tight enclosures with gland type
cable entry points and internal RJ45 ports, so patch
cables with M12-X male on one end and RJ45 male
on the other will be required for a shielded cable.
• At the control panel locations, the rigid steel conduit
will connect directly to the enclosure using either
a dust-tight conduit hub or by transitioning to liquid-
seal flexible conduit and accompanying connectors.
The control panels are dust-tight and utilize DIN style
mounting rail for internal components and plastic
wiring ducts for routing power and control conductors
between components and terminal strips where field
wiring is connected. Therefore, single port RJ45 DIN
mount adapters or DIN mount patch panels will be
BASE CONSIDERATIONS THAT
THE PHYSICAL INFRASTRUCTURE
DESIGNER NEEDS TO DETERMINE
OPTICAL FIBER
Metallic outer versus non-metallic
(all-dielectric)?
Indoor-Outdoor cable (Indoor/Outdoor (I/O) per
ICEA standard for cable that can be used both
indoors and outdoors)?
OM3/OM4/OM5, OS1, OS1a, OS2?
Connector type—LC pigtail/splice-on versus
mechanical pre-polished?
Topology/Redundancy?
BALANCED TWISTED-PAIR
Cat 5e/Cat 6/Cat 6a?
Shielded/Unshielded?
Indoor/Outdoor?
Voltage rated insulation?
Teck armored?
Latency (Ether-channel)?
Topology/Redundancy?
WIRELESS
Point to Point?
Point to Multi-point?
Redundancy/Mesh Technology?
Nature of application that is critical to production,
latency/jitter sensitivity?
Mobile obstructions, such as objects/material/equipment/
cranes?
Frequencies (900MHz, 2.4GHz, 5GHz)?
Other wireless networks in range
(i.e., interference)?