Bennett 3722 - Electrical Field Wiring General Information (Contd); Phase Crossing Warning; Conduit and Wiring Practices

19
120001 Rev K 1-19-18
In instances where new dispensers are replacing old dispensers, Bennett recommends that new wiring
be pulled to each dispenser.
If existing wiring is used (not recommended) and does not reach to the dispenser electronic head (top
area) of the dispenser, the wires can be extended only if the connections are soldered, weather proof
and contained in an explosion-proof type junction box. Follow all current national and local electrical
codes for extending wire runs.
The maximum distance from the breaker panel to the dispenser is 500 feet. For self-contained units
increase the motor wire size from 14Ga to 12Ga for runs over 50 feet, increase the motor wire size from
12Ga to 10Ga for runs over 100 feet and increase the motor wire size from 10Ga to 8 Ga for runs over
250 feet.
The power for the motors in 1 h.p. self-contained standard pumps must be located on the opposite
phase from the dispenser electronic power or be connected at 230V. This is necessary to limit the
electronic noise from feeding back into the dispenser’s electronic power. Failure to observe this will
create problems with the operation of the dispenser’s computers. Note: if 230v motor power is used be
sure to set the motor switch located on the motor to the high voltage setting by moving the switch to the
high position. Note: 2 h.p. Big Fueler motors do not have an adjustment switch. They must be wired for
230vac 1 phase, or 380vac 3 phase.
WARNING: DO NOT CROSS PHASE THE DISPENSERS OR DAMAGE WILL OCCUR. When
installing more than one dispenser the remote sub-pump relay control wire from each dispenser must be
on the same phase of power or cross phasing will occur at the sub-pump relay. This means that the
electronic power for all dispensers at the site must be on the same phase.
Electrical Conduits - Make sure that each dispenser has its own electrical underground conduit. Wiring
from multiple dispensers in a single conduit is not allowed. All underground conduit should be rigid metal
and drawn up tight. The use of PVC (plastic) conduit is not allowed and may void the Bennett Warranty.
Make sure that vapor “seal offs” are properly installed on all conduits at and from each dispenser. Make
sure any intercom wiring is not run with dispenser field wiring. A separate (second) conduit must be run
if using an intercom at the dispenser.
Electrical Field Wiring
General Information (Cont’d)