Areas of trade size conduit, Conduit layout/installation specifications – Gasboy CFN Series Site Controller III User Manual
Page 28
Trade Size (in)
Internal Diameter
Area (sq. units)
Fill Area (sq. units) 25% Fill
in
mm
in
mm
in
mm
1/2
0.629
16
0.303
196
0.076
49
3/4
0.826
21
0.532
343
0.133
86
1
1.063
27
0.862
556
0.215
139
1-1/4
1.378
35
1.50
968
0.375
242
1-1/2
1.614
41
2.04
1314
0.509
329
2
2.087
53
3.36
2165
0.839
541
System Layout
Conduit Layout/Installation Specifications
Page 24 MDE-4298D CFN Series Site Controller III Installation Manual · September 2009
Areas of Trade Size Conduit
To determine the conduit size required, refer to the table,
, to find the area for each wire gauge. Add up all wire areas. Refer to the table
and select the smallest number in the Fill Area (sq. units) 25% Fill
column (based on NEC 501-1) that comes closest to the total wire area but does not exceed it.
Conduit Layout/Installation Specifications
• All wiring must be installed and used in accordance with all building/fire codes, all Federal,
State, and Local codes, National Electrical Code (NFPA 70), NFPA 30, and Automotive and
Marine Service Station (NFPA 30A) codes and regulations. Canadian users must also comply
with the Canadian Electrical Code.
• All peripheral equipment connected to the RS-232 ports must be listed, have an Electronics
Industries Association (EIA) standard RS-232 communications protocol, and should not be
installed in a hazardous location.
• Power for the system components, data terminal, and modem must come from a separate
dedicated circuit breaker rated at no less than 10 Amp.
• All conduits must be made of metal to provide the necessary shielding.
• All conduit should be run underground, not overhead.
• DC pulser, DC RS-485 and/or RS-422 communication wires can be combined in the same
conduit. It is recommended that the DC pulser, RS-485 and/or RS-422 wiring be in a separate
metal conduit from any AC wires. However, the DC pulser, RS-485 and/or RS-422 wires can
share the conduit with AC wires if shielded cable is used as specified in
on
“Short Haul Modem (SHM) RS-422”
on
on
• Use the chart in
on
• Refer to
on
to determine the conduit size according to the
number of wires and wire gauge.
• RS-232 communication must not exceed 100 feet. RS-232 communication wires must be in a
metal conduit separate from any AC wires.
• For communication distances exceeding 100 feet, you must use Gasboy Short Haul Modems
(SHMs).
• In submersible applications, starter relays are always recommended; however, the system can
directly drive motors up to 3/4 HP at 120 VAC, or 1-1/2 HP at 240 VAC.
• Suction pumps over 3/4 HP at 120/240 VAC, or 1-1/2 HP at 240 VAC must use a starter
relay. Wire the starter relay in place of the motor in the applicable pump wiring drawing.
• A minimum distance of 18” must be maintained between the ICR post and any of the pumps/
remote dispensers.
• In the conduit layouts, disregard the submersible pumps in the drawings if the hose outlets are
suction pumps.