Johnson Controls Metasys N2 - Page 44

44
Network Communications—N2 Communications Bus
Notes:
For the surge protector's hard ground (HG), use 12 AWG stranded wire, 4.57 m (15 ft) maximum length.
Make sure wires entering surge protector's enclosure are not close to wires leaving the enclosure.
SURGE4
IAC/IFC/ILC - Unshielded N2 Bus
* The IAC, IFC, and ILC must each be on a separate N2 Bus.
Building One
2
4
6
8
10
1
3
5
7
9
Surge
Protector
Protected
Unprotected
N2+
N2-
REF
REF
N2-
N2+
HRD GRD
NCM**
IAC, IFC, or
ILC*
HG
Metal Enclosure
Building Two
2
4
6
8
10
1
3
5
7
9
Surge
Protector
ProtectedUnprotected
HG
HG
HG
N2 Bus
+
-
R
REF
N2-
N2+
N2 Bus N2 Bus
+
-
R
+
-
R
+
-
R
HG
** Standard, Fire,
or Security NCM.
IAC, IFC, or
ILC*
Metal Enclosure
HG
N2+
N2-
REF
IAC, IFC, or
ILC*
N2 Bus
Figure 27: Installing Surge Protector for IAC/IFC/ILC