Filter
Top Products
C-2
Table C-1 lists the correct meter readings for indicating appliances and initiating devices.
Table C-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 K Ohms
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 50 Ohms
From zone - OUT to - IN Less than 50 Ohms
Class B/Style Y Notification Appliance Circuit (each signal circuit)
From + to ground Infinity
From - to ground Infinity
Resistance across circuit:
In one direction
In opposite direction
10 K Ohms
Less than 200 Ohms
Class A/Style Z Notification Appliance Circuit (each signal circuit)
From + to ground Infinity
From - to ground Infinity
From zone + OUT to + IN Less than 50 Ohms
From zone - OUT to - IN Less than 50 Ohms
Resistance across circuit:
In one direction
In opposite direction
Infinity
Less than 200 Ohms
Shielding
Shield to ground Infinity
Shield to - Infinity
Shield to + Infinity
MAPNET/IDNet II Loops (ZAMs and IAMs)
From MAPNET/IDNet II + to ground Infinity
From MAPNET/IDNet II - to ground Infinity
Appendix C: Checking System Wiring, Continued
Meter Readings