The document discusses different types of wiring used in building management systems, including control wiring, power wiring, and communication wiring. It provides details on wire types for various applications, such as CAT5 or CAT6 cable for communication between DDC controllers. Diagrams show typical system architectures and wiring schematics for HVAC components like VAV boxes and precision air conditioners connected over a BACnet network through a gateway.

1. Wiring
• Control Wiring
– Multi strand , Annealed tin copper ,with sheath and
PVC insulation
• Power Wiring
– Multistrand Copper conductor with PVC insulation
• Communication wiring
– Multistrand , sheathed , stranded PVC insulated
– CAT 5 or 6 Cable

2. DDC CONTROL LOOP

3. BACNet Router
SCHEMATIC DIAGRAM FOR BUILDING MANAGEMENT SYSTEM
Alarm / Report
Printer
Modem
Operator Work station
Remote Web browser client
BACnet / LON
DDC
DRAWING: AHU Control
T
Two way valve actuator
Room Temperature sensor
www
SMS
Soft Room Temperature Set point
from Operator Workstation
CAT 6 Cable
Shielded Twist Pair

4. Typical BMS System Architecture

5. Four-conductor shielded cable with
metal foil shield and drain wire.

6. Application & Use Type of Wire
1. Communication Cabling between
DDC to DDC
2 core Twisted & Shielded Pair of
Wire 0.8 sq mm to 1.5 sq mm
2. Signal Cabling between Thermistor
Temp. Sensors & DDC
2 core Twisted & Shielded Pair of
Wire 0.8 sq mm to 1.5 sq mm
3. Signal Cabling between Active
Sensors & DDC
2 or 3 or 4 core Twisted & Shielded
Pair of Wire 1 sq mm or 1.5 sq mm
4. Cabling between VAV Zone Sensor
& VAV
2/3/4 core depending upon the type
of Zone Sensor 0.8 sq mm to 1.5 sq
mm
5. Cabling between Valve Actuator &
DDC
2/4 core 1 or 1.5 sq mm
6. System Level Cabling CAT 6 cabling
Typical I-O DEVICES IN HVAC SYSTEM

7. Typical BMS Wiring Interlock with the Starter Panel

8. Differential Pressure Sensor Wiring Details

9. Building Room Pressure Transducer Wiring Details

10. VFD Wiring Details

11. Typical Chiller Motorized Isolation Valve Wiring

12. Typical DDC Wiring Details

13. BACNet Router
SCHEMATIC DIAGRAM FOR BUILDING MANAGEMENT SYSTEM
Alarm / Report
Printer
Modem
Operator Work station
Remote Web browser client
BACnet / LON
DDC
DRAWING : Networked VAVs
THROUGH GATEWAY
www
SMS
VAV Controller ..n
VAV Controller-01
Gateway
Room Temperature &
Set point
Damper
Actuator
CAT 5 Cable
Shielded Twist Pair
ShieldedTwistPair

14. BACNet Router
SCHEMATIC DIAGRAM FOR BUILDING MANAGEMENT SYSTEM
Alarm / Report
Printer
Modem
Operator Work station
Remote Web browser client
BACnet / LON
DDC
DRAWING : Networked PACs
THROUGH GATEWAY
www
SMS
Gateway
PAC PACPAC
PAC= Precision Air Conditioning
CAT 5 Cable
Shielded Twist Pair
Shielded Twist Pair