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Ground Fault Detection
battery terminals, including FACP battery terminal. Ground faults must then be detected by the first SK-PS in the chain. Disable ground
fault detection on other SK-PS units by sliding SW1 to the left. Ensure ground fault detection is enabled on SK-PS1, the first power
supply from the FACP, by sliding SW1 to the right. 18 AWG wire minimum must be used.
to next
negative
battery
terminal
TB4
NO NC C
optional
ZNAC-PS
converter
SW1 ground fault
detection switch
TB15
Battery -
2.
Ground fault monitoring may be accomplished by mapping an annunciator point on a UL 864-listed FACP as ground fault. The
annunciator shall be wired adjacent to the FACP so all displays are grouped for viewing and operation by one person.
Addressable FACP: The FACP must be programmed to turn on the common trouble LED, trouble tone, and a separate yellow
annunciator point when the monitor module connected to the SK-PS ground fault relay is initiated. The annunciator point must also be
labeled as "XXX Ground Fault" where "XXX" describes ground fault origin.
to next
monitor
module
TB4
NO NC C
NO NC C
TB15
SK-PS Series Instruction Manual — P/N LS10227-002SK-E:C 2/2/2022
wire nut, ground
Power Supply
cables, and
ground stud
NO NC C
NO NC C
card
Figure 2.14 Ground Fault Detection Option 1
NO NC C
NAC1
A UX1
NAC2
A UX2
Figure 2.15 Ground Fault Detection Option 2 - Addressable FACP
NAC1
AUX1
NAC2
AUX2
TB4
NO NC C
NO NC C
NO NC C
TB15
Host FACP
Battery -
NAC1
A UX1
NAC2
A UX2
+
Maintain 0.25" spacing
between power-limited and
non-power-limited wiring.
Installation
UL 864-listed
annunciator
listed
UL 864-
addressable control
panel
-
SLC
21
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