Engineering Documentation

Chapter 4 – Equipment Controllers
Wire Type Requirements
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Chapter 4 – Equipment Controllers
Wire Type Requirements
Equipment Controller Wire Type Requirements.
Circuit Type Class Wire Type (AWG) Distance Conduit Sharing
1)
Input Power 2 Check local codes Check local codes Class 2
Digital Output 2 Check local codes 150 ft (46 m) Class 2
Analog Output 2 Check local codes 150 ft (46 m) Class 2
Digital Inputs 2 No. 18 to No. 22 TP 150 ft (46 m) Class 2
Analog Inputs 2 No. 18 to No. 22 TP 100 ft (30 m) Class 2
Room Temperature Sensor 2 Pre-terminated 3 TP 100 ft (30 m) Class 2
KNX/PL-Link 2 No. 18 to No. 20 STP 1,000 ft (328 m) Class 2
P1, MS/TP or FCOM 2 No. 24 STP w/ Reference 4,000 ft (1200 m) up to
100 Kbps, 80% above.
Class 2
SCOM 2 No. 24, 2 x STP w/ Reference or 3 x
STP
4,000 ft (1200 m) up to
100 Kbps, 80% above.
Class 2
Actuator/Signal 2 No. 18 to No. 14, 4C common twist 260 ft (80 m) No. 14 Class 2
1)
Conduit sharing rules were determined through EMI and shared conduit testing. These rules indicate wiring methods that have
no adverse effect on the proper operation of the equipment, but do not necessarily indicate compliance with local codes.
Power Source Requirements
BACnet Equipment Controllers can be powered in three ways. Correct sizing and
fusing must be maintained for each of these powering techniques:
● Individual transformer using a transformer rated for Class 2 service.
● Class 2 power trunk. For more information, see the section Power Trunk
Guidelines [➙ 64].
● Low voltage source of the device the controller is controlling (for example, fan
powered boxes, electric room heat, fan coils, and heat pumps).
Total VA rating is dependent upon the controlled DO loads (for example, actuators,
contactors, etc.).
CAUTION
The phase of all devices on a power trunk must be identical.
Phase differences can destroy equipment. Any relays, EPs, or contactors sharing
power must be clamped with MOVs at their locations.