Installation Manual

Versus Technology, Inc.
DT10000-A0001 19 Revision 8 December 1998
c) Connect the sensor wire-pair on the collector end to the associated punch-down block pin-pair using the
punch-down block tool.
d) Mark the sensor as installed on the Installation Checklist.
5. Checking Isolation:
In the course of interconnecting many sensors to a Collector, it is not uncommon to make contact with a sharp
metal edge, ganged knockout box, or electrical ground with one of the conductors. It is critical, however, that
such accidental connections be located and cleared prior to system start up. The effect of these accidental
connections can range from mild to severe. In many cases, erratic behavior may be noted. In some cases,
equipment damage may occur. In any case, an electrical code violation has been produced
.
To verify that the system is "isolated" from building and electrical grounds, use an ohmmeter or multimeter set
to the 2K (2000)-ohm scale. Clip one probe to the nearest electrical conduit, electrical ground, or metal water
pipe and then touch the other probe to each punch block row in turn. Every row MUST indicate an infinite
(open) connection. If this is not the case, the suspect line must be traced to find the accidental connection to the
structure that has been made.
NOTE:
It may be helpful to disconnect the Collector from the punch block while this measurement is being
made. This will isolate the sensor wiring completely.
6. Repeat steps 4 and 5 for each collector.
7. Replace the bridge clips.