Page 454 - Womens Pavilion
P. 454
TotalAlert Infinity™ NFPA Medical Gas Notification System
• Circuit length not to exceed 5000 feet.
• Cable must be twisted-pair shielded type.
Multi-pair cables within one common
shield are acceptable.
2.3.3 Determining Number of
Conductors
The following rules along with references
to this manual’s schematics clarify wiring
requirements.
Figure 21: Zone Valve Box Location • Digital Gas Sensor Modules
Two conductor cables (must be twisted pair
2.3 Wiring type with shield) are required for each Gas
Sensor module to the Gas Input board (B60
2.3.1 General Requirements or B65).
1. All alarms are to be powered from life Refer to NFPA Area Wiring Diagram (Section
safety branch of emergency power system 3.2)
as required by applicable standards. • Switched signal inputs
2. Protect all wiring from physical damage Two conductor cables (must be twisted pair
by raceways or conduit as required by ap- type with shield) are required for each signal
plicable standards. between the signal input terminals and the
3. Wire alarm panels directly to switches or source signal switch.
sensors as required by applicable stan- These signals can originate at source equip-
dards. ment or from pressure switches mounted on
4. Wiring runs should be made with color main pressure / vacuum pipelines.
coded wire. Record color, signal, and When two master alarms are required, the
source of signal for each wiring lead to aid same switch / relay contacts can be wired to
in connection of alarm finish components. both alarm panels. (See CAUTION below).
5. Avoid installing alarm panels near radio Both pairs of wires should originate from
transmitters, electrical motors, or switch- switch/relay contacts.
gear.
Refer to NFPA Master/Combination Wiring
Diagram (Section 3.1/3.3) for B1X, B50, B65
2.3.2 Wire Type and Size signal boards.
All low voltage wiring must meet the follow-
ing criteria:
• Copper wire no smaller than 22 AWG,
conductor insulation at least 0.010in
(0.25mm), jacket insulation at least
0.030in (0.76mm), rated for 300V and
60°C (140°F) minimum.
2-3 4107 9016 58.02
