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ROC827 Instruction Manual
Issued Mar-06 Installation and Use 2-5
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 ROC827 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 AWG or smaller wire.
2.2 Required Tools
Use the following tools to perform installation and maintenance
procedures on the ROC827. For tools required for installation or
maintenance of accessories, refer to the ROC/FloBoss Accessories
Instruction Manual (Form A4637).
Philips 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.