89
Appendix G Checking system wiring
This appendix contains instructions on how to use a volt/ohm meter to check the field wiring to the
4100ESi.
Using the Volt/Ohm Meter
When using the volt/ohm meter to check each circuit, ensure that the following notes and instructions
are adhered to:
Ensure that no power is applied to the 4100ESi fire alarm panel and that all internal
panel wiring is properly connected, such as terminal blocks, LED/switch module ribbon
cables, and so on.
⋅ Use the earth stud in the control panel as the earth connection for all measurements to
ground.
⋅ Disconnect the wires for each circuit from the 4100ESi terminals before testing it.
⋅ Measuring resistances between 4100ESi terminals or to ground will give meaningless
results.
To check each circuit using a volt/ohm meter, complete the following steps:
1. Disconnect the wires for each circuit from the terminals on the 4100ESi panel before testing it. If
it is a Class A, loop type of circuit, for example, MX or IDNet loop, ensure that both ends of the loop
are disconnected from the 4100ESi.
2. 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. The
meter readings must show less than 1V.
3. Set the volt/ohm meter to a 60VDC range and repeat step 2. The meter must read less than 0.5V.
4. 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 11. Locate and correct any abnormal
conditions at this time.
If the reading indicates an open circuit in a detector circuit, ensure that 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.
5. To verify that each circuit is free of grounds and extraneous voltages, repeat steps 1-4 for all field
wiring.
To Next Page
Loading...
Need help?
General
