8-3
Checking system wiring, continued
Meter readings Table 8-1 lists the correct meter readings for indicating appliances and initiating devices.
Note: Ground refers to earth ground.
Table 8-1. Acceptable zone and signal circuit meter readings
Circuit type Meter reading
Class B/Style B Initiating Device (Zone) Circuit
From zone + to zone – (each zone) 3.3 KOhms
From zone + to ground Infinity
From zone - to ground Infinity
Class A/Style D Initiating Device (Zone) Circuit
From zone + to zone – (each zone) Infinity
From zone + to ground Infinity
From zone - to ground Infinity
From zone + OUT to + IN Less than 25 Ohms
From zone - OUT to - IN Less than 25 Ohms
Class B/Style Y Notification Appliance Circuit (each signal circuit)
From + to ground Infinity
From - to ground Infinity
Resistance across circuit 10 KOhms
Class A/Style Z Notification Appliance Circuit (each signal circuit)
From + to ground Infinity
From - to ground Infinity
From B+ to A+ Less than 50 Ohms
From B- to A- Less than 50 Ohms
Resistance across circuit 10 KOhms
IDNET+ Loops (ZAMs and IAMs)
From IDNET+ “+” to ground Infinity
From IDNET+ “-” to ground Infinity
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