Innotech Genesis V4 System - Manual (Page 100)

Installation Instructions for Innotech Genesis Systems
Edition 011100
A-19
Figure A-18 shows the preferred connection point for the screen earth. Fitting it on the
screen terminal of one of a group of Digital Controllers gives optimum protection to the
greater number of Digital Controllers. The earthing point for the screen is at the first
Digital Controller in a group located together and supplied from one switchboard. This
preferred connection point does not remove the hazard that the screen voltage at point A
of Figure A-18 is not at earth voltage.
Figure A-18. Use of GENII Poly Switch Boards, Circuit 2
WARNING
ALTHOUGH AN IMPROVEMENT OVER PREVIOUS EARTH-
CONNECTION METHODS, THE CIRCUITS DESCRIBED IN
PARAGRAPH
A-4.2.10 STILL DO NOT REMOVE THE
ELECTRICAL SHOCK HAZARD DESCRIBED IN THE
PREVIOUS PARAGRAPH.
Screen 1 2
Connect Screen
Screen 1 2
Connect Screen
Screen 1 2
Connect Screen
Poly-Switch
board only links
data. Screen
isolated.
Poly-Switch
board only links
data. Screen
isolated.
Only four outer
links fitted.
Screen is not
earthed.
Screen 1 2
Connect Screen
Switchboard or
Control Panel No. 2
Switchboard or
Control Panel No. 1
A
Poly-Switch
board only links
data. Screen
isolated.