Issue
Is there surge protection available for a BACnet/MSTP or RS-485 trunk?
Environment
- BACnet/MSTP
- RS-485 trunk
- Surge protector
Cause
Install surge protector to prevent devices from abnormal electrical spike, which might damage devices.
Resolution
In the Network 8000 Hardware Installation Practices manual (F-23061) pages 21-26, the GCMA-131-1 is used for data line surge protection in conjunction with the AS-8969-21 capacitor grounding the shields as shown.
The same components and procedures apply to BACnet/MSTP or RS-485 trunks. If there are power line issues, review the PAS-29901-400 lightning arrestors. The GCMA-131-1 and its associated installation shown on pages 22-23 of the above manual can be used. Also, the E-1001-111 transzorb shown on page 26 can be used. It is important to have a GOOD earth ground when applying these devices.
