Motorola iDEN Site Controller System Manual page 47

Gen 3 Site Controller System Manual
CAUTION
68P80801E30-A 5/1/2002
The site ground wire should drop into the top of the cabinet and be
connected to a single designated grounding stud. Single hole lugs (1/2"
diameter) are used for these grounding connections.
#6 AWG ground wires are attached from the ground studs on the rear
Note:
of the EAS/EAS2 and Controller housings to the cabinet ground bus
bar system.
DO NOT DAISY-CHAIN MULTIPLE EQUIPMENT CABINET
GROUNDS USING A SINGLE GROUND WIRE. DOING SO
INCREASES THE OVERALL INDUCTANCE OF THE GROUND
WIRE WHICH CAN DISTRIBUTE SURGE ENERGY AMONG
THE CABINETS INSTEAD OF TO THE MASTER GROUND
BAR.
The equipment cabinets are classified as surge producers due to external
coaxial cable connections. Surges from outside the site can enter the site
grounding system via the coaxial cables. To prevent damage to the
equipment, each cabinet must be connected to master ground bar through a
minimum wire size of at least #2 AWG. Green insulated wire must be used
to identify all ground wiring.
Cable Tray Grounding
The cable tray assembly must be designed and installed so that it does not
come into contact with metal conduits, pipes, or other metal objects. The
cable tray assembly must also be connected to the master ground bar through
the use of a single dedicated wire. The connecting wire shall be a minimum
size of #6 AWG green-insulated copper wire.
Any metal-to-metal joints on the cable tray assembly must be bonded
together with a wire jumper to prevent electrical discontinuity, unless the
tray connectors are specifically designed to insure continuity. Painted
surfaces on the cable tray assembly must be scraped clean at the point where
the jumper wire is attached to ensure a good electrical connection. Repaint
cable tray assembly surfaces, if necessary.
Grounding Requirements
CAUTION
!
Chapter 3 Pre-Installation
3-17