Johnson Controls Metasys N2 - Page 46

46
Network Communications—N2 Communications Bus
Metal Enclosure
SURGE6
Metal Enclosure
ASC
HG
Building Two
Building One
2
4
6
8
10
1
3
5
7
9
Surge
Protector
N2+
N2-
REF
ProtectedUnprotected
2
4
6
8
10
1
3
5
7
9
Surge
Protector
Protected Unprotected
Repeater
REF
N2-
N2+
HRD GRD
NCM
HG
ASC
Notes:
For 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.
HG
HG
N2 Repeater - Unshielded N2 Bus
+
-
R
HG
COM
+
-
R
+
-
R
+
-
R
N2 Bus N2 Bus N2 Bus
N2 Bus
D
D
DD
COM
Side A
Side BSide B
REF
N2-
N2+
Figure 29: Installing Surge Protector for N2 Bus Repeater