User`s guide

V3-T9-270 Volume 3—Power Distribution and Control Assemblies CA08100004E—November 2013 www.eaton.com
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9.5
Metering Devices, Protective Relays, Software and Connectivity
Connectivity Options
INCOM Network
INCOM was specifically
designed with the intention of
delivering a comprehensive
and powerful energy
management solution for
use in electrical distribution
environments while ensuring
affordability, flexibility,
simplicity and noise immunity.
An INCOM network installed
per the following rules will
allow the user to fully realize
all of the above advantages.
(Refer to Eaton document
TD17513 for specific system
layout recommendations
and details.)
Rule 1: Cable Selection—
Twisted Shielded Pair
Approved cable types:
●
Any of the cables in the
Belden 9463 family
●
Quabbin 6205
●
CommScope 9022
●
Manhattan Electric M4154
●
IMPCABLE—a 600V rated
cable custom designed for
INCOM—
Style # 2A95705G01
Rule 2: Cable Intermixing
Due to impedance
differences between
IMPCABLE and the Belden
9463 family, the main cable
run(s) should be entirely
for the 9463 family OR
IMPCABLE: do not alternate
between these types. The
cable used for taps can be
different from the main run.
Rule 3: System Topology,
Size and Capacity
Supports daisy chain, star
and multi-level network
segment topologies.
Note: Star Segment Topology is
not recommended for new
designs.
See Page V3-T9-271. Surge
protection is required for
FSK networks that leave a
building at the egress/ingress
of the building.
●
Supports distances up to
10,000 ft (3048m) per
segment when designed
within the specifications of
this guideline
●
Supports up to 1000
devices on a single
network segment
●
Supports sub-network
master devices and
associated sub-networks
●
Supports 1200 or
9600 baud rate
●
Attenuation:
●
Total system capacity:
25 dB
●
Attenuation per device:
0.01 dB
●
Attenuation for approved
wire types, see tables
below
Cable Attenuation
Attenuation at Star
●
Definitions:
●
Daisy chain: point-to-
point wiring between
devices or clusters of
devices
●
Star: single point with a
number of long lines
emanating from it
●
Long line: >200-foot
(61m) wire run
●
Simple tap: <200-foot
(61m) connection to
cluster of devices
Rule 4: Cable Splicing
The goal is to create a secure
electrical connection while
minimizing exposure to
electrical transients. Ferrules
are used to dress cable ends
in order to avoid problems
associated with frayed and
loose wires. Besides
facilitating cable installation,
subsequent data line
troubleshooting and
downtime are minimized.
Most INCOM devices have
built-in three-pole terminal
blocks for data lines and
shield. For older INCOM
devices that have only two
terminals, shield continuity
must be ensured by other
means. Additional terminal
strips should be utilized when
splicing elsewhere in the
electrical enclosure or facility
to ensure secure electrical
connections. All devices, End
of Line Termination Resistors
and Taps should be wired in
parallel across the cable.
Rule 5: Cable Shielding
The cable shielding and outer
jacket should not be stripped
back beyond 1.5 inches (38
mm). Terminal blocks are
used at tap points to ensure a
continuous metallic shield
ground path. To ensure a
secure electrical connection
when daisy-chaining INCOM
devices that have built-in
two-pole terminal blocks, use
crimp sleeves to join the two
shield drain wires. The cable
shield ground path for a main
network and sub-network
must not be joined. Each
should have a separate
connection to earth ground
reference.
Rule 6: Cable Grounding
The shield should be
continuous across a network
segment and connected to
the building’s electrical
system grounding electrode
conductor. The 2005 NEC
provides the following
guidance on grounding
communication cables:
1. When a communication
cable enters a building, a
primary protector is required
and must be grounded as
described in Section 800 IV.
Specifically, Paragraphs
800.93 and 800.100 define
grounding requirements for
the primary protector.
2. Grounding systems are
generally covered by Section
250 III. The grounding
electrode conductor is
specifically covered by
Paragraphs 250.62, 250.64,
250.66, 250.68 and 250.70.
3. Bonding requirements
between communication
systems and the power
distribution system is
specified by Paragraph
250.94.
A solid earth ground is
accomplished by connecting
the shield ground path’s drain
wire to a #14 AWG or larger
multi-stranded wire that has
an impedance path of 1 ohm
or less to the building’s
grounding electrode
conductor.
Rule 7: Cable Termination
Each network segment
requires a minimum of two
End of Line Termination
Resistors (EOLTRs). The
EOLTRs maintain signal
strength and minimize
reflections. The EOLTRs
should be 1/2 watt 100 ohm
non-inductive resistors, such
as carbon composition or
metal film. Wire-wound
resistors are not acceptable.
Taps on network segments
should not be terminated.
Some INCOM devices have
the EOLTR permanently
installed and must be located
at the end of a main run.
Other INCOM devices have
an EOLTR that can be
switched to optionally
terminate the network
segment at the device. Care
must be exercised when
installing devices containing
termination resistors
that the switches are set
appropriately. A minimum of
two, up to a maximum of five
EOLTRs must be installed on
each network segment as
dictated by network topology.
Rule 8: Device Address
In order to avoid the
possibility of devices in a
Main Network having the
same addresses as those
in Subnetworks, set Main
Network device addresses
at 100 or higher excluding
addresses 901 to 908.
Cable
Type
Attenuation/
1000 Feet (305m)
IMPCABLE 1.6 dB
Belden 9463 family 2.0 dB
Number of
Long Lines Attenuation
33.5 dB
46 dB
5 8 dB