Design Installation Operation Manual NANO/MAR/SYSTEM January 1, 2023 | version 1.2 P
20
23.1
W
IRING A SOLENOID ACTIVATION SYSTEM
The solenoid should be fitted with two diodes. One diode for the end of line monitoring. The other is
a flyback diode. A fly back diode is a diode connected across the coil used to eliminate flyback, which
is the sudden voltage spike seen across an inductive load when its supply current is suddenly reduced
or interrupted. It is used in circuits with a possible inductive load.
IMPORTANT
Despite the presence of a button on the NCP front for manual extinguishing activation only, we do
recommend a service/maintenance key switch in the extinguishing output line to perform test and
maintenance work without activating the extinguishing system.
24
W
IRING
&
CABLE SPECIFICATIONS
:
▪
There is NO need for shielded cable
▪
Use a pair twisted cable, this strength the protection against electrical or magnetic field.
▪
Minimal solid copper core diameter, extinguisher line cable <50 meters length 1,0 mm² (AWG 18)
▪
Minimal solid copper core diameter, extinguisher line cable >50 meters length 1,5 mm² (AWG 16)
▪
Minimal solid copper core diameter, fire detection cables 0,5mm² (AWG 20)
▪
Maximum solid copper core diameter other cables 1,0mm² (AWG 18)
▪
Maximum conductor loop resistance, 1,5mm²
cable is 24 Ω/km.
▪
Maximum cable length of the fire zone cables is 50 meters
▪
Maximum cable length of the cable from NCP to NETB is 30 meters
▪
The total cable length of all extinguishers together is max 100 meters in total
