Installation manual

FuelMaster

Installation Manual

Conduit Applications. See Figure 3-3 for a sample site layout containing a Master FMU on one

island, a Satellite FMU on another island, an oil dispenser on a third island, and an EIU and gate

controller on a fourth island. The sample site layout includes conduit requirements that have been

projected in accordance with the NEC. Be sure to check local codes for compliance.

NOTE

• Conduit will not be necessary in all applications. Wireless communications are possible

between the Central Controller and Master FMU, between Master and Satellite FMUs,

between Master FMUs and tank monitors, and between Master FMUs and transaction

printers. Use of a Data Logger can also eliminate the need for a conduit to an onsite

transaction printer.

• If there is only one conduit to the FMU, and it has power wires in it, the power wires

may be eliminated to make room for a communications cable by obtaining power from

another source. Examine the possibility of pulling power wires through a pulse/control

wire conduit from a nearby dispenser.

FMU’s require, as a minimum, a conduit for power and one conduit to each dispenser for control and

pulse wiring. Where wireless communications are not used, Master FMU’s will require a conduit for

communications with the Central Controller as well as a conduit for communications to each Satellite

FMU and tank monitor. These conduit cannot also contain AC power wires. Transaction printer and

tank monitor communications wiring is low voltage and may be routed in the same conduit as Central

Controller communications wiring.

Total

Conduit Inside 40% 25%

Size

Area Area Area

1/2 0.314 0.1256 0.0785

3/4 0.549 0.2196 0.1373

1 0.887 0.3548 0.2218

1-1/4 1.526 0.6104 0.3815

1-1/2 2.071 0.8284 0.5178

2 3.408 1.3632 0.8520

Table 3-1. Rigid Metal Conduit Fill Capacity

Wire/Cable Diameter Area

18 AWG TFFN 0.0841 0.0055

16 AWG TFFN 0.096 0.0072

14 AWG THHN 0.111 0.0097

12 AWG THHN 0.130 0.0133

10 AWG THHN 0.164 0.0211

Belden 8723 0.160 0.0201

Belden 9552 0.368 0.1064

Table 3-2. Typical Wire/Cable Cross Sectional Area

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