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Conduit Requirements
Conduit Requirements
All wiring (AC and DC) connecting the different components of the Gasboy Fuel Management
System must be installed in threaded, rigid, metal conduit except as noted in
Requirements" on page 17
ACCEPTABLE. Components of the system include pumps, dispensers, submersible pumps,
submersible starter relays, the circuit breaker panels, optional wall-mount pump control units
and the TopKAT system. Communications equipment signal wires must also be run in metal
conduit, except for RS-422 wiring as noted in
Communication equipment signal wires must also be run in metal conduit. High-voltage (AC)
and low-voltage (DC) must not be combined in a common conduit, junction box, or wire
trough unless cable is used as specified in
All conduits must be connected to the TopKAT pedestal through the holes and knockouts
provided by the factory. Do not make any other holes in this unit. If you must make holes at
locations other than those provided, contact Gasboy for approval first.
All wiring and conduit runs must conform with all building/fire codes, all Federal, State, and
Local codes, the National Electrical Code (NFPA 70), NFPA30, and the Automotive and
Marine Service Stations Code (NFPA 30A). Canadian users must also comply with the
Canadian Electrical Code.
Use the tables below as a guideline to determine the proper conduit sizes for the Gasboy
TopKAT fuel management system. When planning the orientation of the wiring runs, follow
the applicable Gasboy wiring diagram and consider the layout of the components at the site.
Long runs or a large number of bends may require you to increase conduit size over what is
listed.
To determine conduit size needed, use the
area for each wire gauge. Add up all wire areas. Use the
(above) to select the smallest number in the 25% fill area (based on NEC 501-1) that comes
closest without exceeding the total wire area.
THHN/THWN Wire Areas
Gauge
MDE-4319A TopKAT Fuel Managment System Installation Manual · November 2005
and
"RS-422 - Short Haul Modems" on page
Diameter
inches
18
.090
16
.104
14
.118
12
.135
10
.169
8
.216
6
.259
4
.331
3
.359
2
.394
1063A
.417
"Communication Requirements" on page
"Communication Requirements" on page
THHN/THWN Wire Areas
Areas of Trade Size Conduit
Area (square units)
millimeters
inches
2.29
2.64
2.95
3.43
4.29
5.49
6.60
8.41
9.14
10.01
10.59
General Installation
"Communication
20. PVC IS NOT
17.
17.
table (above) to find the
table
millimeters
.007
4.1
.009
5.5
.011
6.8
.014
9.2
.022
14.5
.037
23.7
.053
34.2
.086
55.5
.102
65.6
.122
78.7
.137
88.4
Page 11
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