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General Installation
with AC wires in metal conduit. The shield drain wire must be connected to the system AC
ground. Only AC wires for the system and pumps can be installed in the AC conduit. Do not
run the cable outdoors without the use of metal conduit. Do not run this cable overhead,
outdoors.
The cable can be run indoors without the use of metal conduit. The shield drain wire must be
connected to the system AC ground (at one end only).
If using cable other than that recommended above, the RS-485 field wires must be installed in
a metal conduit separate from any AC wires.
5
Distance: The maximum overall field wiring cable length between all units is not to exceed
1500 feet (455m).
RS-485 - Standalone TopKAT or Wall-Mount PCU
When the TopKAT is to communicate to a 9800 or wall-mount PCU through Port 1 (RS-485)
of the TopKAT and the TopKAT is not directly mounted on the 9800, the appropriate
interconnect cable must be used. It must always be used in this configuration and is allowable
for distances up to 1500 feet (455m). See
wiring diagrams.
Installation Requirements
1
Internationally and domestically: All wiring is to be installed and used in accordance with all
applicable national, state, and local building/fire/electrical codes. Additionally, in the USA,
installations must comply with the National Electrical Code (NFPA 70), NFPA 30, and the
Automotive and Marine Service Station Code (NFPA 30A) codes and regulations. Canadian
installations must comply with the Canadian Electrical Code.
Cable: Twisted pair shielded cable is highly recommended for RS-485 wiring. Although it is
2
recommended that wires be run in a conduit separate from AC wires, they can be combined in
the same conduit with AC wires providing UL-Listed cable with the following specifications
is used:
• Conductor: 18 AWG stranded wire. 1 twisted-pair.
• Shield: Foil-wrapped 100% coverage and/or tinned copper braid 90% coverage
• Drain Wire: Stranded, tinned copper, 20 AWG or larger/or braided shield
• Voltage Rating: Maximum operating voltage of 600V
• Environmental: Gas- and oil-resistant; suitable for wet or dry locations.
Gasboy can supply Belden 1120A (P/N C09672) which is a UL-Listed, 2-conductor cable that
meets the requirements listed above.
Note: Belden 1120A is UL-Listed but not CSA listed.
Cable with a voltage rating of less than 600V must be installed in a conduit separate from all
AC wires.
Conduit: When using the recommended shielded twisted-pair cable described previously, RS-
3
485 wires can be run with AC wires in metal conduit. The shield drain wire must be connected
to the system AC ground. Only AC wires for the system and pumps can be installed in the AC
Page 18
"Port Communication Wiring" on page 30
MDE-4319A TopKAT Fuel Managment System Installation Manual · November 2005
Communication Requirements
for
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