CurrentGuard
™
and CurrentGuard
™
Plus Installation, Operation and Maintenance Manual
9
Connecting Form C
Dry Contacts
Fig. 6 Remote Monitoring
Terminal Block
Contacts shown in energized normal state
(no fault condition).
COVER REAR VIEW
All CurrentGuard units come standard with one set of Form "C" dry
relay contacts for the surge protective device status. These contacts are
for connection to a user-provided remote alarm and monitoring cir-
cuit. The relay contacts are rated 150VDC/125VAC with maximum
switching power of 30WDC/60VA AC. See Figure 6 for the form C con-
tact configuration and terminal location on the monitor board. The
annotations on the diagram match the markings on the terminal
block.
When input power is present on all phases, terminals “NO” and “COM”
are an open circuit and terminals “NC” and “COM” are a closed circuit.
The contacts change state when the unit has encountered failure to
one or more phases.
The installer must provide the appropriate raceway and wiring for the
monitoring circuit, observing the restrictions and conduit openings
illustrated in an earlier section of this manual. The installer must
route the monitoring conductors to the terminal blocks on the door-
mounted main monitoring board. Route the wires to allow the door
to be opened and closed properly. Tighten screws on terminals to
3.5 in-lbs (0.4 Nm). This terminal block will accept wire sizes #28AWG
to #16AWG. #18 – #20 AWG is recommended.
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