System information

2.2-10
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February 2009
Power Management Systems & Products
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Sheet 02
Network Connectivity
Wiring Guidelines
018
INCOM Network
INCOM was specifically designed with
the intention of delivering a compre-
hensive and powerful energy manage-
ment solution for use in electrical
distribution environments while ensur-
ing affordability, flexibility, simplicity
and noise immunity. An INCOM net-
work 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 Figure 2.2-6. 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
(3048 m) 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 2.2-6
and 2.2-7)
Table 2.2-6. Cable Attenuation
Table 2.2-7. 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 (61 m)
wire run
❑ Simple tap: <200-foot (61 m)
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 con-
nection 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 con-
nected to the building’s electrical sys-
tem grounding electrode conductor.
The 2005 NEC provides the following
guidance on grounding communica-
tion 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 & 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 imped-
ance path of 1 ohm or less to the build-
ing’s grounding electrode conductor.
Rule 7: Cable Termination
Each network segment requires a min-
imum 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 termina-
tion 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 Subnet-
works, set Main Network device
addresses at 100 or higher excluding
addresses 901 to 908.
Cable
Type
Attenuation/
1,000 Feet (305 m)
IMPCABLE
Belden 9463 family
1.6 dB
2.0 dB
Number of
Long Lines
Attenuation
3
4
5
3.5 dB
6 dB
8 dB