ROC364 Instruction Manual
1-5 General Information Rev Jun/05
3. Group defines the hazardous material in the surrounding atmosphere and include:
♦ 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 nature.
♦ Group D – Atmosphere containing propane, gases, or vapors of equivalent nature.
For the ROC to be approved for hazardous locations, it must be installed in accordance with the National
Electrical Code (NEC) guidelines or other applicable codes.
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 procedures in
a hazardous area could result in personal injury or property damage.
1.4.4 Power Installation Requirements
Typical sources of primary power for ROC installations are line power and solar power. Be sure to route
line power away from hazardous areas, as well as sensitive monitoring and radio equipment. Local and
company codes generally provide guidelines for line power installations. Adhere rigorously to all local
and National Electrical Code (NEC) requirements for line power installations.
Solar power allows installation of the ROC in locations where line power is not available. The solar
panels and batteries must be properly sized for the application and geographic location to ensure
continuous reliable operation. Information contained in the ROC/ROC Accessories Instruction Manual
(Form 4637) can assist in determining the solar panel and battery requirements.
A site may have additional power requirements for radios, repeaters, and other monitoring devices.
Power supply and converter accessories can minimize the number of separate power sources required for
an installation.
The ROC364 can operate from either a 12-volt or a 24-volt nominal power source. If 24-volt transmitter
power is required when operating on 12-volt power, the ROC364 requires an I/O Converter Card to be
installed. Refer to Section 5. The ROC364 has a low-voltage cut-off circuit built in to guard against
draining down power supply batteries.
1.4.5 Grounding Installation Requirements
Ground wiring requirements for line-powered equipment are governed by the National Electrical Code
(NEC). When the equipment uses line power, the grounding system must terminate at the service
disconnect. All equipment grounding conductors must provide an uninterrupted electrical path to the
service disconnect. This includes wire or conduit carrying the power supply conductors.
The National Electrical Code Article 250-83 (1993), paragraph c, defines the material and
installation requirements for grounding electrodes.
The National Electrical Code Article 250-91 (1993), paragraph a, defines the material requirements
for grounding electrode conductors.
The National Electrical Code Article 250-92 (1993), paragraph a, provides installation requirements
for grounding electrode conductors.
The National Electrical Code Article 250-95 (1993) defines the size requirements for equipment
grounding conductors.
(32 paginas)
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