1.3 Hazardous Areas
Any fuel dispenser is a hazardous area as defined in the National Electrical Code. Installation must be in
accordance with the following:
l
National Electrical Code (NFPA No. 70)
l
Motor Fuel Dispensing Facilities and Repair Garages Code (NFPA No. 30A)
1.3.1 NFPA/NEC – Class I, Div. 1 & Div. 2
The Class I, Division 1 and Class I, Division 2 hazardous areas are specified below:
Class I locations
. Class I locations are those in which flammable gases or vapors are or may
be present in the air in quantities sufficient to produce explosive or ignitable mixtures. Class I
locations include the following:
1.
Class I, Division 1
. A Class I, Division 1 location is a location:
a. In which ignitable concentrations of flammable gases or vapors may exist under
normal operating conditions.
b. In which ignitable concentrations of such gases or vapors may exist frequently
because of repair or maintenance operations or because of leakage.
c. In which breakdown or faulty operation of equipment or processes might release
ignitable concentrations of flammable gases or vapors, and might also cause
simultaneous failure of electric equipment.
2.
Class I, Division 2
. A Class I, Division 2 location is a location:
a. In which volatile flammable liquids or flammable gases are handled, processed, or
used, but in which the hazardous liquids, vapors, or gases will normally be
confined within closed containers or closed systems from which they can escape
only in case of accidental rupture or breakdown of such containers or systems, or
in case of abnormal operation of equipment; or
b. In which ignitable concentrations of gases or vapors are normally prevented by
positive mechanical ventilation, and which might become hazardous through
failure or abnormal operations of the ventilating equipment; or
c. That is adjacent to a Class I, Division 1 location, and to which ignitable
concentrations of gases or vapors might occasionally be communicated unless
such communication is prevented by adequate positive-pressure ventilation from a
source of clean air, and effective safeguards against ventilation failure are
provided.
WARNING:
To prevent possible fire or explosion, do not mount your
system site controller or any other electrical part of the system, including
printers and modems, within or above the defined "hazardous" areas.
Doc. No.: M1900 Rev.: 8
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