EF-Series Instruction Manual
Rev 2/01 1-9
1.5.3 Compliance with Hazardous Area Standards
The EF-Series Unit has hazardous location approval for Class I, Division 2, Groups A to D exposures.
The Class, Division, and Group terms are defined as follows:
Class defines the general nature of the hazardous material in the surrounding atmosphere.
Class I is for locations where flammable gases or vapors may be present in the air in
quantities sufficient to produce explosive or ignitable mixtures.
Division defines the probability of hazardous material being present in an ignitable
concentration in the surrounding atmosphere. Division 2 locations are presumed to be
hazardous only in an abnormal situation.
Group defines the hazardous material in the surrounding atmosphere. Groups A to D are
defined as follows:
♦
Group A – Atmosphere containing acetylene.
♦
Group B – Atmosphere containing hydrogen, gases or vapors of equivalent nature.
♦
Group C – Atmosphere containing ethylene, gases or vapors of equivalent hazards.
♦
Group D – Atmosphere containing propane, gases or vapors of equivalent hazards.
For the EF-Series Unit to be approved for hazardous locations, it must be installed according to the
National Electrical Code (NEC) Article 501.
CAUTION
When installing units in a hazardous area, make sure all installation
components selected are labeled for use in such areas. Installation and
maintenance must be performed only when the area is known to be non-
hazardous.
1.5.4 Power Installation Requirements
The typical source of primary power for EF-Series Unit installations is solar power.
Refer to Section 1.7, Power Consumption Calculation, on Page 1-15 concerning solar power, auxiliary
device power, and batteries.
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