This appendix contains instructions on how to use a volt/ohm meter to check system
wiring.
When using the volt/ohm meter to check each circuit, make sure to adhere to the notes
and instructions below.
Notes:
For these tests, the mains connection to the panel must be in place, but the mains
must be switched off and the battery must be disconnected. All other internal panel
wiring must be properly connected (terminal blocks, LED/switch module ribbon
cables, etc.).
Use the earth stud in the control panel as the earth connection for all measurements to
ground.
Measuring resistances between 4100ES terminals or from terminals to ground will
give meaningless results.
Use the volt/ohm meter as described in the steps below to check each circuit type.
1. Disconnect Wires: At the 4100ES panel, disconnect the wires for each circuit
from the terminals before testing it. If it is a Class A (loop) type of circuit, e.g.,
IDNet loop, ensure that both ends of the loop are disconnected from the
4100ES.
2. Test for AC: Check each circuit for extraneous voltage by setting the volt/ohm
meter to a 300VAC range. Place the meter probes so that the black probe is on
the “-“ wire and the red probe is on the “+” wire. Meter readings must show
less than 1V.
3. Test for DC: Set the volt/ohm meter to a 60VDC range and keep the probes
placed as in step 2. The meter must read less than 0.5V.
4. Test Resistance: Set the volt/ohm meter to OHMS and place the meter probes as
described in step 2. Check the circuits using the resistance measurements in
Table C-1.
Shift the meter probes so that one probe is on both the “+” and “–“ wires, and
the other probe is on the earth terminal in the panel. The meter should read an
open circuit.
Locate and correct any abnormal conditions at this time.
Note 1: If the reading indicates an open circuit in a conventional detector
circuit, make sure the smoke detector heads are properly mounted and seated.
The circuit may also be open if smoke detector power is not present, and if
separately powered 4-wire devices are used.
Note 2: IDNet addressable loops can give a good reading even when certain
wiring faults are present, due to the effect of channel isolators in the loop. The
4100ES-S1 can perform live testing on an IDNet loop for earth faults. See
Appendix D for details about how to do this.
5. Repeat for Next Circuit: Reconnect the circuit wiring to the correct terminals,
and move to the next circuit to be tested.
Repeat steps 1-4 for all field wiring, to verify that each circuit is free of grounds
and extraneous voltages.
Continued on next page
To Next Page
Loading...
Need help?
General
