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ePAQ-9150
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Power
Power lines must have sufficient capacity to provide the maximum power over the
distance from the power source, at the highest expected ambient temperature. An
earth ground must be made to the ground lug in the equipment cabinet and to
designated terminals (see Remote Station Interconnection Diagram). Make certain
to observe polarity on DC lines. Power wiring must comply with local electrical
codes.
As a minimum, the power lines must support the current requirements of paragraph
1.2.2. Specific RTUs may have other equipment installed and may require additional
power. Please refer to appropriate RTU drawings.
Cabling
The wires from each class of external device should be brought into the cabinet in
separate bundles. Ideally, each type should be in a separate cable, but status and
analog wires may be bundled together if absolutely necessary. Keep control lines,
communication lines, and power lines separate from each other and from all other
types of lines.
Securing Cables
Cables should be secured to the cabinet when possible. Use non-abrasive cable
clamps (Alpha Type CCL, or equivalent) and cable ties (T & B "TY-RAP", or
equivalent as required. Since the cable bundles will be thickest at the cabinet entry
point (top or bottom of the cabinet), take extra care to secure the cables in such a
way that they do not interfere with the cabinet door, or with the removal of panels or
circuit cards.
Connections to Terminal Blocks
All external wires are connected at the terminal blocks on the installed panels. It is
recommended that each wire be terminated in a solderless terminal. Make certain to
leave a small "service loop" at each terminal connection.
Copyright © 2016 QEI
CAUTION
OBSERVE ALL SAFETY RULES WHEN WORKING
WITH AC POWER LINES.
Remote Terminal Unit
Section 1
17
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