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ROC827 Instruction Manual
Issued Mar-06 Installation and Use 2-3
Choose a location for the ROC827 away from heavy traffic areas to
reduce the risk of being damaged by vehicles. However, provide
adequate vehicle access to aid monitoring and maintenance.
The site must comply with class limits of Part 15 of the FCC rules.
Operation is subject to the following two conditions: (1) The device
may not cause harmful interference, and (2) the device must accept
any interference received, including interference that may cause
undesired operation.
2.1.3 Compliance with Hazardous Area Standards
The ROC hazardous location approval is for Class I, Division 2, Groups
A, B, C, and D. The Class, Division, and Group terms include:
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 locations that are presumed to be hazardous only in an
abnormal situation.
Group defines the hazardous material in the surrounding atmosphere.
Groups A to D are:
o Group A: Atmosphere containing acetylene.
o Group B: Atmosphere containing hydrogen, gases, or vapors of
equivalent nature.
o Group C: Atmosphere containing ethylene, gases, or vapors of
equivalent nature.
o Group D: Atmosphere containing propane, gases, or vapors of
equivalent nature.
For the ROC827 to be approved for hazardous locations, it must be
installed in accordance with the National Electrical Code (NEC)
guidelines or other applicable codes.
Caution
When working on units located in a hazardous area (where explosive
gases may be present), make sure the area is in a non-hazardous state
before performing procedures. Performing these procedures in a
hazardous area could result in personal injury or property damage.