Wiring, Wire size, Atlas commercial – Gasboy Atlas Fuel Systems Installation Manual User Manual
Page 66: Wiring -4 wire size -4, Wiring -4, Atlas commercial -4
Reference Information
Wiring
Page 7-4 MDE-4331M Atlas® Fuel Systems Installation Manual · September 2014
Wiring
Following are the wiring requirements for the unit:
• All pumps/dispensers must be wired as per NFPA 30A, NFPA 70 and the applicable
national, state, and local codes/regulations.
• All circuits must be NEC class 1 wired [except for the speaker (intercom) circuit, which
must be NEC class 2]. The speaker (intercom) circuit requires a separate 1-inch conduit.
• Only stranded, gas- and oil-resistant copper wires rated for 300 V (up to 240 VAC source)
and 176 °F (80 °C) must be used.
• In the main conduit for retail units (communication), only twisted-pair or two-wire data
pairs must be used for the retail two-wire data loop.
• All dispensers must be wired on the same phase.
Note: If a Gasboy isolation relay box is installed, dispensers are not required to be on the
same phase.
• Only listed wire nuts must be used for connections. Tape is not permitted.
• Seal-off ‘Y’ fitting(s) must be potted after all wires are run and tested to termination
points.
Wire Size
Following table lists the wire size requirements:
115 V Wire Gauge Sizes per Feet/Meters of Run
Feet/Meters 25 feet
8 m
50 feet
15 m
100 feet
31 m
150 feet
46 m
200 feet
61 m
250 feet
76 m
300 feet
91 m
Over 300 feet (91 m), use relay
at motor location
Motor HP
115 V
1/2
14
12
10
8
8
8
8
3/4
14
12
10
8
6
6
6
230 V
1/2
14
12
12
12
10
10
10
3/4
14
12
12
12
10
10
10
1-1/2
12
12
10
10
8
8
6
Wiring
When wiring the Atlas pump/dispenser, it must be noted that there are two types of systems:
• Retail
• Commercial
Atlas Commercial
The Atlas commercial pump/dispenser utilizes two conduits, one for AC power and the other
for DC signals. The two conduits must be kept away from each other to reduce signal
interference. The AC conduit carries the AC power line and supplies power to valves and
motors, whereas the DC conduit delivers the RS-485 or pulse output signals when the pump
communicates with a FMS. In a standalone operation, they will not use either the RS-485 or
pulse outputs.