QT Technologies LLC
QT Technologies LLC (303) 444-3590 FAX (303) 444-8736 Page 6
Wiring Requirements - Option A
The Field Wiring diagrams on this page
and the next describes general require-
ments for conduits and wires. The actual
number of wires ultimately depend on indi-
vidual components, their location, power
ratings, etc.
In general, what you need is this:
1. Pulser signal wires (Low voltage conduit from
fuel dispenser to pedestal- conduit A)
2. Dispenser component signal wires (High volt-
age conduit from fuel dispenser to pedestal-
conduit B)
3. One or two dedicated phone lines (Low voltage
conduit from phone switch to pedestal- conduit
C)
4. A source of local power (High voltage conduit
from circuit breaker to pedestal- conduit D)
5. Pump control wiring (High voltage conduit from
pedestal to pump control relay—conduit E)
6. Any other required conduit (Usually for a tank
mounted pump motor(s), hose reels, outdoor
lighting, etc. - conduit F).
Figure 5—Dispenser Field Wiring—Option A
Tank Terminal Dispenser
Telephone
Company
Power
Circuit
Breaker
Panel
Pump
Relay
Fuel Line
A
B
C
D
E
NOTE: This diagram is for a single dispenser setup. For more than one
dispenser, add additional B & C conduits for each addiitional dispenser and
add another pump relay control wire in conduit E.
IMPORTANT NOTES:
Use stranded wire only
Each pump motor must be actuated through 30 amp
relays. This applies to 120V and 240V motors.
If you deviate from these requirements, please call QT
Technologies at (303) 444-3590.
*The low voltage conductors maybe placed in the high
voltage conduit as long as they are in a shielded cable.
Rigid
Conduit
A
B
C
D
E
F
Size
1/2"
3/4"
1/2"
3/4"
1/2"
1/2"
Description of wires inside conduit
Low voltage for pulser wires
High voltage for reset, clear, slow & fast valves
Low voltage for telephone wire
High voltage for terminal and dispenser power
High voltage pump control wiring
High Voltage pump power
Dispenser Field Wiring Diagram - Option A
Pump Control Relay located remotely
F
Note: The low voltage conductors may be placed in the
high voltage conduit as long as they are in shielded cable.
This would eliminate the requirement for a separate con-
duit just for low voltage wires.
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