Installation
EST3 Installation and Service Manual
5.20
Table 5-3: Field wiring tests
Circuit type Test
Addressable analog circuits 1. Verify the continuity of each conductor. Each conductor
should measure less than 50 Ω.
2. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite if no
devices are connected to the circuit.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.
Traditional initiating device
circuits
1. Verify the continuity of each conductor.
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 approximately 4.7 kΩ 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.
Telephone riser circuit 1. Verify the continuity of each conductor. Each conductor
should measure between 0 and 25 Ω.
2. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite if no
devices are installed on the circuit. The circuit resistance
between conductors should be approximately 15 kΩ with
SIGA-CC1 Single Input Signal Modules and the end
-of-line
resistor correctly installed.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.
RS-485 communication circuits EST3 uses RS485 circuits for the:
• Network data riser
• Network audio riser
• SAC bus
1. Verify the continuity of each conductor. Each conductor
should measure between 0 and 50 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 approximately 50 Ω 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.
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