Gasboy Atlas Fuel Systems Site Prep Manual - Manual (Page 18)

Site Preparation Electrical Requirements
Page 14 MDE-4333E Atlas Fuel Systems Site Preparation Manual · November 2011
Circuit Breakers
Figure 3-1: Circuit Breakers
Do not Use Use
• Install a dedicated UL/ULC/CSA-listed switched-neutral breaker to each circuit leading to
a pump/dispenser or dispenser and STPs. It must be able to disconnect hot and neutral
conductors simultaneously. Single-pole breakers with handle ties must not be permitted.
Ref. NEC 514.11 (Switched Neutral is not allowed in Canada).
• Use only UL/ULC/CSA-listed circuit breaker panel as appropriate for that area.
• Install circuit breakers away from the pumps/dispensers. They must be readily accessible
and clearly marked.
• Install a separate circuit breaker for each STP (dispenser models) or each pump motor
(self-contained models).
• Install one circuit breaker for each pump/dispenser or small island group to allow
powering down of pump/dispenser for service.
Power to the unit must be supplied from a dedicated breaker.
• No other equipment must be powered from this breaker.
• Remote dispensers may be grouped together on a single breaker when the submersible
pump has its own breaker.
• It is recommended that no more than two remote dispensers be powered from one breaker
to maintain isolated control with the circuit breaker panel in case of problems.
• Units directly driving pumps (suction or submersible) must be supplied power from a
separate breaker. A tag on the motor identifies the maximum current draw of the motor. If
two pumps are supplied from one breaker, that breaker must be capable of handling the
load of both motors.
• DEF units contain a special heater to prevent the DEF fluid from freezing during very cold
weather. Properly size circuit breakers to handle normal pump/dispenser power
requirement plus that for the heater.
In cases where multiple remote dispensers supply power to a single submersible
pump, all breakers controlling the remote dispenser must be on the same phase of
power. Failure to do this will damage the equipment. Provisions must be made to
break both legs of any AC circuit.
CAUTION
STP Control Relay Boxes for Dispensers
• Install a separate control relay for each STP.
• Do not use the dispenser relay to power the STP.
• Combined STP Control Relay/Isolation Relay boxes are recommended.