Jgnd Shield Ground - GE Mark VIeS System Manual

10.9 JGND Shield Ground

10.9.1 Functional Description
The Shield Ground (JGND) terminal board mounts along side the terminal board and provides convenient ground connections
for the customer's shield drain wires.
10.9.2 Installation
JGND mounts on a sheet metal bracket attached to the plate, which holds the terminal board. JGND is grounded to the bracket
with the two screws at each end of the terminal board. The customer's shield wires connect to terminals in the Euro-type
terminal block.
One or two JGND can be located on the side of the terminal board mounting bracket, for a maximum of 48 ground
connections.
JGND provides a path to sheet metal ground at the board mounting screw locations. The default mechanical assembly of this
board to its mount includes a nylon washer between the board and the sheet metal. This isolates JGND from the sheet metal
and allows wiring of the board ground current into any desired grounding location. Removal of the washer permits conduction
of the ground currents into local sheet metal and does not require any additional grounding leads.
At the time a JGND board is installed, a choice must be made to conduct ground currents through a wire to designated ground
(washer present) or to conduct directly to sheet metal (washer absent). A direct connection to sheet metal is preferred. If a
wire connection is used, it should be as short as possible, not exceeding 5 cm (2 in).
PDM Power Distribution Modules GEH-6855_Vol_II System Guide 395
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