SECTION 5
ELECTRICAL INSTALLATION
5.1
CAUTION:
This smoke detecting system is not a test instrument. All wiring must be tested for
continuity, shorts, and freedom from grounds prior to making any connections to any part
of the smoke detection system.
5.2
Removal of fuses is not sufficient isolation for any testing or meggering of lines.
5.3
Minimum insulation from ground of all external conductors taken together must be more than 50,000 ohms.
5.4
All wire sizes are specified AWG (American Wire Gauge).
5.5
Minimum working voltage of conductors 18 AWG or larger must be 600 volts.
5.6
Minimum working voltage of conductors 20 AWG or larger must be 300 volts.
5.7
Conductors of the smoke detecting system must not be run in conduits, sheaths, or wireways containing wiring
from any other ship's system.
5.8
Conductors of the smoke detecting system must not be run in conduits, sheaths, or wireways containing wiring
from the system's buzzer or bell.
5.9
Electrical layout for a system of 1 through 24 lines is to be in accordance with Figure 5-1, "Electrical Flow
Diagram, 1 to 24 Lines".
5.10
Electrical layout for a system of 25 through 48 lines is to be in accordance with Figure 5-2, "Electrical Flow
Diagram, 25 to 48 Lines".
5.11
Minimum wire sizes and groupings as shown on Figures 5-1 and 5-2 must be observed.
5.12
Field wiring connections are shown as follows:
a.
Figure 5-7, Field Wiring Diagram, 24 Line Capacity
b.
Figure 5-8, Field Wiring Diagram, 48 Line Capacity
5-1
