EST EST3X - Preliminary Field Wiring Testing

Chapter 5: Installation
128 EST3X Technical Reference Manual
Preliminary field wiring testing
It is recommended that you test all circuits before they are connected to the
control panel components. Table 26 indicates the recommended tests and
acceptable test results.
Note: Individual devices are not checked as part of these tests. All equipment
installed on field circuits must be individually tested to ensure proper operation
when the system running.
Table 26: Field wiring tests
Circuit type
Test
DC notification appliance
circuit
1. Measure the resistance between conductors. The circuit
resistance should be infinite if no devices are installed
on the
circuit. The circuit resistance should be a
pproximately 15 kΩ
when the polarized notification appliances and the end-of-
line
resistor are correctly installed.
2. Reverse the meter leads. The circuit resistance between
conductors should read approximately 10 Ω to 20 Ω. If the
resistance reading is still approximately the same value
when the meter leads are reversed, one or more polarized
devices are installed incorrectly.
3. Measure the resistance between each conductor and earth
ground. The resistance should be infinite.
Audio notification appliance
circuit
1. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite if no
devices are installed on the circuit. The circuit resistance
should be approximately 15 kΩ when the polarized
notification appliances and the end
-of-line resistor are
correctly installed.
2. Reverse the meter leads. The circuit resistance between
conductors should still read approximately 15 kΩ.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.
Signature
data loops 1. With field wiring disconnected, verify the continuity of each
conductor. Each conductor should measure less than 38 Ω.
2. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite if no
devices are connected to the circuit. The circuit resistance
between conductors should be between approximately
18 kΩ (250 devices) and 4.5 MΩ (1 device) when devices
are installed.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.