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1. General Requirements
1. All wiring shall be protected from physical damage by raceways, cable trays or conduit in accordance with NFPA
70, National Electric Code or the Canadian Electrical Code.
2. All alarms are to be powered from the life safety branch of the emergency power system as required by
applicable standards.
3. Alarm panel wires should be directly connected to switches or sensor as required by applicable standards.
4. All wire runs should be made with color coded wire. Record color, signal and source of signal for each wire lead
to aid in connection of alarm finish components.
5. The alarm panel and remote sensors should not be installed near radio transmitters, electrical motors, electrical
control room, switchgear, CT scanners, MRI machines or high voltage lines
6. In the presence of any electrical, magnetic, radio frequencies, wireless or other interference, cable installation
MUST be placed in metallic conduits.
7. No solid wire should be used for connecting sensors or master alarms to source equipment
8. To protect from static electricity, ensure to discharge body static before installing the Medical Gas Alarm and
Sensors
9. Do not ground the shield drain wire at sensor or inside alarm panel back box
10. Electrical cable should not run below sensors or behind the alarm box, to protect from radio frequencies and
EMI
2. Low Voltage wire type, size and other requirements
All low voltage wiring must meet the following criteria:
1. #22 AWG stranded, shielded twisted pair wire ONLY must be used, rated for 300V and 60°C (140°F) minimum.
(Belden 8451 or equivalent)
2. Marrette the sensor cable in a junction box (supplied by others) to the installation cable (supplied by others)
to protect from physical damage, radio frequencies and EMI
3. For multiple sensors, a multi-conductor #22 gauge stranded, shielded and twisted pair cable ONLY must be
used
The following rules along with references to this manual’s schematics clarify wiring requirements. Two conductor cables
(must be #22 gauge stranded, shielded and twisted pair cable type) are required for each Gas Sensor module to the Gas
Input board.
Appendix H
WIRING
