Emerson ROC827 instruction manual Compliance with Hazardous Area Standards

ROC827 Instruction Manual

ƒChoose 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.

ƒThe 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.

2.1.3Compliance 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:

ƒClass 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.

ƒDivision 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.

ƒGroup 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.

oGroup 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.

Issued Mar-06 Installation and Use 2-3