Gasboy Atlas Fuel Systems Site Prep Manual - Manual (Page 19)

MDE-4333E Atlas Fuel Systems Site Preparation Manual · November 2011 Page 15
Electrical Requirements Site Preparation
STP Isolation Relays for Electronic Dispensers
STP isolation relays provide electrical isolation between dispensers and prevent damage from
cross phasing. Refer to MDE-4334 Atlas Start-up/Service Manual and FE-356 Atlas
Retail/Commercial Dispenser Field Wiring.
Note: For 3-phase STP, use isolation relay at the input of the 3-phase STP control box.
• Gasboy requires installation of STP isolation relays in addition to STP control relays.
• Use isolation relays for each STP control line at each dispenser or dispenser grouping on a
single circuit breaker.
• Route neutral wire to the control relays from the dispenser circuit breaker (refer to FE-356
Atlas Retail/Commercial Dispenser Field Wiring, FE-357 Atlas Pump Retail/Commercial
Field Wiring, and FE-361 Atlas Master & Satellite Field Wiring Diagram).
• Combined STP Control Relay/Isolation Relay boxes are recommended.
Conduit
• DEF is non-flammable and creates no explosive vapors. Therefore, installation
requirements for DEF units differ from units that handle hazardous fuels. However,
electrical safety requirements are applicable. If a DEF unit is installed in the Class 1
Division 2 hazard zone of a pump/dispenser delivering flammable fluids, consult Gasboy
Technical Support to determine requirements for installing DEF units in that area.
Generally the unit must be installed to comply with requirements for units handling
flammable fluids for the area within the hazard zone.
• Use 1-inch trade size rigid aluminum conduit with Gasboy pumps/dispensers to connect
wires to the pump/dispenser (Retail).
Two-wire data wires for retail electronics can share power wiring conduit (refer to
model-specific wiring diagrams).
Four-wire data wires for RS-485 communications can share power wiring conduit (refer to
model-specific wiring diagrams).
• Use a threaded, rigid metal conduit or a rigid non-metallic conduit for applications below
the pump/dispenser to carry electrical wires. Conduit must conform to national and local
electrical codes. If you use a nonmetallic conduit, it must be at least 2-feet underground.
The last 2-feet of the underground run to the junction box must be rigid metal conduit or
threaded steel intermediate metal conduit. Tighten all threaded conduits.
• Never share conduit or wire troughs with other manufacturers’ equipment (for example,
speaker wires, canopy lights, and so on). When using RS-485 communications with Atlas
Commercial units communicating with TopKAT
™ or CFN ® , all AC and DC wiring must
be in separate conduit. For more details, refer to “Atlas - Commercial” on page 16 .
Note: You can use the same conduit for routing power to the pump/dispenser and the
Two-wire (Retail) data loop (Class 1 circuit). The Two-wire data loop is a Class 1
circuit.
• Never rely on metal conduit to provide an equipment ground. Run a separate ground wire.
• Never use knock-out boxes or flexible conduit for installation.
Note: Extra junction boxes added to the pump/dispenser must be listed Class 1, Div. 1,
Group C and D explosion-proof.
• Use electrical fittings that are listed for Class 1, Group C and D hazardous locations, as
required by NFPA 30A and NFPA 70.