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PROPRIETARY AND CONFIDENTIAL DRAFT 28/Feb/03

Medical Gas Alarm Network System Interaction
Chapter 3: Theory of Operation

Local Alarm Wiring Conventions

The following section provides an overview of typical wiring conventions for
Local Alarm inputs and outputs (see figure 3-3 on page 3-12):

• Depending on the type of signal, the outputs from the Local Alarm to both
of the Master Alarms can either be wired individually or combined, refer to
the NFPA 99 standard, or CAN/CSA-Z305.1-92. If the outputs are
combined, they only register as one signal to both of the Master Alarms.
The Local Alarm has individual signals connected to each alarm input.
• Polarity is determined by the indicators on the MedPlus TotalAlert™
Alarm Network Local Alarm. Switches and contacts are not usually
marked with polarity indicators.
3
NOTE:
Refer to the wiring instructions from the manufacturer for specific switches
and relays.
• Polarity from the source equipment’s switches and relays must be
maintained to the Local Alarm.

• The wiring from the positive (+) output terminals from the Local Alarm
must be wired to the positive (+) input terminals on the Master Alarm
Breakout P.C. Boards, and the negative (-) output terminals to the negative
(-) input terminals.

MedPlus TotalAlert™ Alarm Network Operation and Maintenance Manual (man291ra) Page 3 - 11