Gasboy TopKAT Fuel Management System Installation User Manual
Page 26
General Installation
Communication Requirements
Page 20
MDE-4319E TopKAT™ Fuel Management System Installation Manual · August 2008
• Conduit: When you use the recommended shielded twisted-pair cable, RS-485 wires can
be run with AC wires in the 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 when outdoors.
The cable can be run indoors without the use of a metal conduit. The shield drain wire
must be connected to the system AC ground (at one end only).
If you use cables other than the ones that are recommended above, the RS-485 field wires
must be installed in a metal conduit away from AC wires.
• Distance: The maximum overall field wiring cable length between all units must not
exceed 1500 feet (455 m).
RS-485 - Standalone TopKAT System or Wall-Mount PCU
When the TopKAT system must communicate to a 9800 or wall-mount PCU through Port 1
(RS-485) of the TopKAT system 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. A
distance of up to 1500 feet (455 m) is allowed. Refer to
for the wiring diagrams.
Installation Requirements
• 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: A twisted-pair shielded cable is highly recommended for RS-485 wiring. Although
it is recommended that wires be run in a conduit away from AC wires, they can be
combined in the same conduit with AC wires, provided that a UL-listed cable with the
following specifications is used:
- Conductor: 18 AWG stranded wire; one 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 600 V
- Environmental: Gas and oil-resistant; suitable for wet or dry locations.
Gasboy can supply Belden 1120A (part number 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.
Cables with a voltage rating of less than 600 V must be installed in a conduit away from
all AC wires.
• Conduit: When you use the recommended shielded twisted-pair cable described
previously, RS-485 wires can be run with AC wires in a 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
a metal conduit. Do not run this cable overhead when outdoors.