Crowcon Vortex - Figure 20 Decision Tree for Determining Earthing Requirements

Vortex Manual Appendix F
Issue 7 December 2009 73
APPENDICES
Start
Q 1
System is
all IS
System is
mixed IS
and non-IS
System is
not an IS
system
Q 2
Q 3
System can
use either
zener
barrier or
galvanic
isolator
System
must use
galvanic
isolator
Q 2
Q 3
System can
use either
zener
barrier or
galvanic
isolator
System
must use
galvanic
isolator
Q 2
Q 3
Q 4
Diagrams
2 and 4
Diagrams
1 and 5
Diagrams
2 and 5
Q 4
Diagrams
2, 3 and 4
Diagrams
1, 3 and 5
Diagrams
2, 3 and 5
Diagrams
1 and 3
Diagrams
1 and 3
Diagrams
2 and 3
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES
NO
YES
NO
YES
NO
NONE
SOME
ALL
Figure 20 Decision Tree for determining Earthing Requirements