35 / 182
ROC800-Series Instruction Manual
Revised Jul-14
Installation and Use
2-5
Proper grounding of the ROC800 helps to reduce the effects of electrical
noise on the ROC800’s operation and protects against lightning.
Install a surge protection device at the service disconnect on DC voltage
source systems to protect against lightning and power surges for the
installed equipment. All earth grounds must have an earth to ground rod
or grid impedance of 25 ohms or less as measured with a ground system
tester. You may also consider a telephone surge protector for the dial-up
modem communications module.
A pipeline with cathodic protection is not a good ground. Do not tie
common to the cathodic part of the pipeline.
When connecting shielded cable, be sure to tie the shielded cable to
earth ground at the end of the cable attached to the ROC800 only. Leave
the other end of the shielded cable open to avoid ground loops.
2.1.6 I/O Wiring Requirements
I/O wiring requirements are site- and application-dependent. Local,
state, and NEC requirements determine the I/O wiring installation
methods. Direct buried cable, conduit and cable, or overhead cable are
all options for I/O wiring installations.
Shielded, twisted-pair cable is recommended for I/O signal wiring. The
twisted-pair minimizes signal errors caused by Electro-Magnetic
Interference (EMI), Radio Frequency Interference (RFI), and transients.
Use insulated, shielded, twisted-pair wiring when using MVS signal
lines. The removable terminal blocks accept 12 to 24 AWG wire.
2.2 Required Tools
Use the following tools to perform installation and maintenance
procedures on the ROC800.
Phillips screwdriver, size 0.
Flat blade screwdriver, size 2.5 mm (0.1 inch).
Flat blade screwdriver, large, or other prying instrument.
2.3 Housing
The housing case is made of a patented Acrylonitrile Butadiene Styrene
(ABS) plastic (U.S. Patent 6,771,513) and the wire channel covers are
made of polypropylene plastic.